Jeep Toad
09-09-2006, 01:36 PM
#242
Guest
Posts: n/a
Re: Jeep Toad
And of course the current system of truck brakes is so wonderful and
reliable that all those emergency dump lanes full of sand are merely a
figment of everyone [but Bill's] imagination.
PS. Did I miss Bill's obligatory irrelevant link?
L.W.(Bill) ------ III proclaimed:
> That is so.... WRONG it's overwhelming! So I'll just eliminate the
> maxies, for the others that may believe in this group, They use air
> pressure to release the parking brakes they are not used in stopping! I
> think that most people could tell by the number of gauges we have to
> monitor that if a part like disk brakes could be used safely we would
> have them on our half a million dollar tractors:
> http://www.----------.com/kenworthdash.jpg
> God Bless America, Bill O|||||||O
> mailto:--------------------
>
> Simon Juncal wrote:
>
>>mabar wrote:
>>
>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>semi-trucks use drum brakes?
>>>
>>>I also am curious - why do they use drums rather than disks?
>>
>>This is one of those questions that has a bunch of answers which are all
>>more or less true.
>>
>>Because the industry is traditional and doesn't like change, because
>>drums perform on Semi's pretty well in an overall sense, because
>>changing to discs requires a lot of new technology and new untested (in
>>trucking) systems which can fail until the bugs are worked out causing
>>law suits. In short because the industry is cheap and as stubborn as
>>Bill about adapting to new stuff.
>>
>>Probably the major reason (and long winded one) though is mechanical;
>>Because air brake systems works backwards from how we are used to brakes
>>working...
>>
>>The default state on a semi's brake system is LOCKED UP... Unlike
>>hydrolic systems where a lack of fluid will result in NO BRAKES, a lack
>>of air will result in total brakes. This is because air is used to push
>>against the heavy springs that are ALWAYS trying to push the brake shoes
>>against the drums. The air is used to compress these springs.
>>
>>The mechanical advantage here is that in emergencies Semi's have brakes
>>even without a running motor OR air in the system. With no motor you can
>>still lightly brake a Semi to a safe stop. With no air it will come to a
>>more or less screeching halt, but at least it will stop.
>>
>>The same could certainly be done using discs but would require a system
>>that is very different from our cars discs and thus lots of R&D dollars.
>>Drums have almost no advantages over discs, they are FAR heavier, FAR
>>less thermally efficient, they trap water, and heat, they have LESS
>>friction surface until they are just about locked up. and they use WAY
>>WAY more parts, they are manually adjusted (even automatic slack
>>adjusters must be manually adjusted occasionally!)
>>
>>You asked :)
>>--
>>Simon
>>"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein
reliable that all those emergency dump lanes full of sand are merely a
figment of everyone [but Bill's] imagination.
PS. Did I miss Bill's obligatory irrelevant link?
L.W.(Bill) ------ III proclaimed:
> That is so.... WRONG it's overwhelming! So I'll just eliminate the
> maxies, for the others that may believe in this group, They use air
> pressure to release the parking brakes they are not used in stopping! I
> think that most people could tell by the number of gauges we have to
> monitor that if a part like disk brakes could be used safely we would
> have them on our half a million dollar tractors:
> http://www.----------.com/kenworthdash.jpg
> God Bless America, Bill O|||||||O
> mailto:--------------------
>
> Simon Juncal wrote:
>
>>mabar wrote:
>>
>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>semi-trucks use drum brakes?
>>>
>>>I also am curious - why do they use drums rather than disks?
>>
>>This is one of those questions that has a bunch of answers which are all
>>more or less true.
>>
>>Because the industry is traditional and doesn't like change, because
>>drums perform on Semi's pretty well in an overall sense, because
>>changing to discs requires a lot of new technology and new untested (in
>>trucking) systems which can fail until the bugs are worked out causing
>>law suits. In short because the industry is cheap and as stubborn as
>>Bill about adapting to new stuff.
>>
>>Probably the major reason (and long winded one) though is mechanical;
>>Because air brake systems works backwards from how we are used to brakes
>>working...
>>
>>The default state on a semi's brake system is LOCKED UP... Unlike
>>hydrolic systems where a lack of fluid will result in NO BRAKES, a lack
>>of air will result in total brakes. This is because air is used to push
>>against the heavy springs that are ALWAYS trying to push the brake shoes
>>against the drums. The air is used to compress these springs.
>>
>>The mechanical advantage here is that in emergencies Semi's have brakes
>>even without a running motor OR air in the system. With no motor you can
>>still lightly brake a Semi to a safe stop. With no air it will come to a
>>more or less screeching halt, but at least it will stop.
>>
>>The same could certainly be done using discs but would require a system
>>that is very different from our cars discs and thus lots of R&D dollars.
>>Drums have almost no advantages over discs, they are FAR heavier, FAR
>>less thermally efficient, they trap water, and heat, they have LESS
>>friction surface until they are just about locked up. and they use WAY
>>WAY more parts, they are manually adjusted (even automatic slack
>>adjusters must be manually adjusted occasionally!)
>>
>>You asked :)
>>--
>>Simon
>>"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein
09-09-2006, 01:36 PM
#243
Guest
Posts: n/a
Re: Jeep Toad
And of course the current system of truck brakes is so wonderful and
reliable that all those emergency dump lanes full of sand are merely a
figment of everyone [but Bill's] imagination.
PS. Did I miss Bill's obligatory irrelevant link?
L.W.(Bill) ------ III proclaimed:
> That is so.... WRONG it's overwhelming! So I'll just eliminate the
> maxies, for the others that may believe in this group, They use air
> pressure to release the parking brakes they are not used in stopping! I
> think that most people could tell by the number of gauges we have to
> monitor that if a part like disk brakes could be used safely we would
> have them on our half a million dollar tractors:
> http://www.----------.com/kenworthdash.jpg
> God Bless America, Bill O|||||||O
> mailto:--------------------
>
> Simon Juncal wrote:
>
>>mabar wrote:
>>
>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>semi-trucks use drum brakes?
>>>
>>>I also am curious - why do they use drums rather than disks?
>>
>>This is one of those questions that has a bunch of answers which are all
>>more or less true.
>>
>>Because the industry is traditional and doesn't like change, because
>>drums perform on Semi's pretty well in an overall sense, because
>>changing to discs requires a lot of new technology and new untested (in
>>trucking) systems which can fail until the bugs are worked out causing
>>law suits. In short because the industry is cheap and as stubborn as
>>Bill about adapting to new stuff.
>>
>>Probably the major reason (and long winded one) though is mechanical;
>>Because air brake systems works backwards from how we are used to brakes
>>working...
>>
>>The default state on a semi's brake system is LOCKED UP... Unlike
>>hydrolic systems where a lack of fluid will result in NO BRAKES, a lack
>>of air will result in total brakes. This is because air is used to push
>>against the heavy springs that are ALWAYS trying to push the brake shoes
>>against the drums. The air is used to compress these springs.
>>
>>The mechanical advantage here is that in emergencies Semi's have brakes
>>even without a running motor OR air in the system. With no motor you can
>>still lightly brake a Semi to a safe stop. With no air it will come to a
>>more or less screeching halt, but at least it will stop.
>>
>>The same could certainly be done using discs but would require a system
>>that is very different from our cars discs and thus lots of R&D dollars.
>>Drums have almost no advantages over discs, they are FAR heavier, FAR
>>less thermally efficient, they trap water, and heat, they have LESS
>>friction surface until they are just about locked up. and they use WAY
>>WAY more parts, they are manually adjusted (even automatic slack
>>adjusters must be manually adjusted occasionally!)
>>
>>You asked :)
>>--
>>Simon
>>"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein
reliable that all those emergency dump lanes full of sand are merely a
figment of everyone [but Bill's] imagination.
PS. Did I miss Bill's obligatory irrelevant link?
L.W.(Bill) ------ III proclaimed:
> That is so.... WRONG it's overwhelming! So I'll just eliminate the
> maxies, for the others that may believe in this group, They use air
> pressure to release the parking brakes they are not used in stopping! I
> think that most people could tell by the number of gauges we have to
> monitor that if a part like disk brakes could be used safely we would
> have them on our half a million dollar tractors:
> http://www.----------.com/kenworthdash.jpg
> God Bless America, Bill O|||||||O
> mailto:--------------------
>
> Simon Juncal wrote:
>
>>mabar wrote:
>>
>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>semi-trucks use drum brakes?
>>>
>>>I also am curious - why do they use drums rather than disks?
>>
>>This is one of those questions that has a bunch of answers which are all
>>more or less true.
>>
>>Because the industry is traditional and doesn't like change, because
>>drums perform on Semi's pretty well in an overall sense, because
>>changing to discs requires a lot of new technology and new untested (in
>>trucking) systems which can fail until the bugs are worked out causing
>>law suits. In short because the industry is cheap and as stubborn as
>>Bill about adapting to new stuff.
>>
>>Probably the major reason (and long winded one) though is mechanical;
>>Because air brake systems works backwards from how we are used to brakes
>>working...
>>
>>The default state on a semi's brake system is LOCKED UP... Unlike
>>hydrolic systems where a lack of fluid will result in NO BRAKES, a lack
>>of air will result in total brakes. This is because air is used to push
>>against the heavy springs that are ALWAYS trying to push the brake shoes
>>against the drums. The air is used to compress these springs.
>>
>>The mechanical advantage here is that in emergencies Semi's have brakes
>>even without a running motor OR air in the system. With no motor you can
>>still lightly brake a Semi to a safe stop. With no air it will come to a
>>more or less screeching halt, but at least it will stop.
>>
>>The same could certainly be done using discs but would require a system
>>that is very different from our cars discs and thus lots of R&D dollars.
>>Drums have almost no advantages over discs, they are FAR heavier, FAR
>>less thermally efficient, they trap water, and heat, they have LESS
>>friction surface until they are just about locked up. and they use WAY
>>WAY more parts, they are manually adjusted (even automatic slack
>>adjusters must be manually adjusted occasionally!)
>>
>>You asked :)
>>--
>>Simon
>>"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein
09-09-2006, 01:36 PM
#244
Guest
Posts: n/a
Re: Jeep Toad
And of course the current system of truck brakes is so wonderful and
reliable that all those emergency dump lanes full of sand are merely a
figment of everyone [but Bill's] imagination.
PS. Did I miss Bill's obligatory irrelevant link?
L.W.(Bill) ------ III proclaimed:
> That is so.... WRONG it's overwhelming! So I'll just eliminate the
> maxies, for the others that may believe in this group, They use air
> pressure to release the parking brakes they are not used in stopping! I
> think that most people could tell by the number of gauges we have to
> monitor that if a part like disk brakes could be used safely we would
> have them on our half a million dollar tractors:
> http://www.----------.com/kenworthdash.jpg
> God Bless America, Bill O|||||||O
> mailto:--------------------
>
> Simon Juncal wrote:
>
>>mabar wrote:
>>
>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>semi-trucks use drum brakes?
>>>
>>>I also am curious - why do they use drums rather than disks?
>>
>>This is one of those questions that has a bunch of answers which are all
>>more or less true.
>>
>>Because the industry is traditional and doesn't like change, because
>>drums perform on Semi's pretty well in an overall sense, because
>>changing to discs requires a lot of new technology and new untested (in
>>trucking) systems which can fail until the bugs are worked out causing
>>law suits. In short because the industry is cheap and as stubborn as
>>Bill about adapting to new stuff.
>>
>>Probably the major reason (and long winded one) though is mechanical;
>>Because air brake systems works backwards from how we are used to brakes
>>working...
>>
>>The default state on a semi's brake system is LOCKED UP... Unlike
>>hydrolic systems where a lack of fluid will result in NO BRAKES, a lack
>>of air will result in total brakes. This is because air is used to push
>>against the heavy springs that are ALWAYS trying to push the brake shoes
>>against the drums. The air is used to compress these springs.
>>
>>The mechanical advantage here is that in emergencies Semi's have brakes
>>even without a running motor OR air in the system. With no motor you can
>>still lightly brake a Semi to a safe stop. With no air it will come to a
>>more or less screeching halt, but at least it will stop.
>>
>>The same could certainly be done using discs but would require a system
>>that is very different from our cars discs and thus lots of R&D dollars.
>>Drums have almost no advantages over discs, they are FAR heavier, FAR
>>less thermally efficient, they trap water, and heat, they have LESS
>>friction surface until they are just about locked up. and they use WAY
>>WAY more parts, they are manually adjusted (even automatic slack
>>adjusters must be manually adjusted occasionally!)
>>
>>You asked :)
>>--
>>Simon
>>"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein
reliable that all those emergency dump lanes full of sand are merely a
figment of everyone [but Bill's] imagination.
PS. Did I miss Bill's obligatory irrelevant link?
L.W.(Bill) ------ III proclaimed:
> That is so.... WRONG it's overwhelming! So I'll just eliminate the
> maxies, for the others that may believe in this group, They use air
> pressure to release the parking brakes they are not used in stopping! I
> think that most people could tell by the number of gauges we have to
> monitor that if a part like disk brakes could be used safely we would
> have them on our half a million dollar tractors:
> http://www.----------.com/kenworthdash.jpg
> God Bless America, Bill O|||||||O
> mailto:--------------------
>
> Simon Juncal wrote:
>
>>mabar wrote:
>>
>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>semi-trucks use drum brakes?
>>>
>>>I also am curious - why do they use drums rather than disks?
>>
>>This is one of those questions that has a bunch of answers which are all
>>more or less true.
>>
>>Because the industry is traditional and doesn't like change, because
>>drums perform on Semi's pretty well in an overall sense, because
>>changing to discs requires a lot of new technology and new untested (in
>>trucking) systems which can fail until the bugs are worked out causing
>>law suits. In short because the industry is cheap and as stubborn as
>>Bill about adapting to new stuff.
>>
>>Probably the major reason (and long winded one) though is mechanical;
>>Because air brake systems works backwards from how we are used to brakes
>>working...
>>
>>The default state on a semi's brake system is LOCKED UP... Unlike
>>hydrolic systems where a lack of fluid will result in NO BRAKES, a lack
>>of air will result in total brakes. This is because air is used to push
>>against the heavy springs that are ALWAYS trying to push the brake shoes
>>against the drums. The air is used to compress these springs.
>>
>>The mechanical advantage here is that in emergencies Semi's have brakes
>>even without a running motor OR air in the system. With no motor you can
>>still lightly brake a Semi to a safe stop. With no air it will come to a
>>more or less screeching halt, but at least it will stop.
>>
>>The same could certainly be done using discs but would require a system
>>that is very different from our cars discs and thus lots of R&D dollars.
>>Drums have almost no advantages over discs, they are FAR heavier, FAR
>>less thermally efficient, they trap water, and heat, they have LESS
>>friction surface until they are just about locked up. and they use WAY
>>WAY more parts, they are manually adjusted (even automatic slack
>>adjusters must be manually adjusted occasionally!)
>>
>>You asked :)
>>--
>>Simon
>>"I may be wrong, but I'm not uncertain." -- Robert A. Heinlein
09-09-2006, 02:45 PM
#245
Guest
Posts: n/a
Re: Jeep Toad
On Sat, 09 Sep 2006 10:36:46 -0700, Lon <lon.stowell@comcast.net>
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
Well, I'm not Bill, and this link isn't irrelevant, but if you REALLY
need to see some links, try this:
http://www.madsci.org/posts/archives...2326.Eg.r.html
or this:
http://www.tpub.com/eqopbas/69.htm
;-)
>
[snip]
....
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
Well, I'm not Bill, and this link isn't irrelevant, but if you REALLY
need to see some links, try this:
http://www.madsci.org/posts/archives...2326.Eg.r.html
or this:
http://www.tpub.com/eqopbas/69.htm
;-)
>
[snip]
....
09-09-2006, 02:45 PM
#246
Guest
Posts: n/a
Re: Jeep Toad
On Sat, 09 Sep 2006 10:36:46 -0700, Lon <lon.stowell@comcast.net>
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
Well, I'm not Bill, and this link isn't irrelevant, but if you REALLY
need to see some links, try this:
http://www.madsci.org/posts/archives...2326.Eg.r.html
or this:
http://www.tpub.com/eqopbas/69.htm
;-)
>
[snip]
....
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
Well, I'm not Bill, and this link isn't irrelevant, but if you REALLY
need to see some links, try this:
http://www.madsci.org/posts/archives...2326.Eg.r.html
or this:
http://www.tpub.com/eqopbas/69.htm
;-)
>
[snip]
....
09-09-2006, 02:45 PM
#247
Guest
Posts: n/a
Re: Jeep Toad
On Sat, 09 Sep 2006 10:36:46 -0700, Lon <lon.stowell@comcast.net>
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
Well, I'm not Bill, and this link isn't irrelevant, but if you REALLY
need to see some links, try this:
http://www.madsci.org/posts/archives...2326.Eg.r.html
or this:
http://www.tpub.com/eqopbas/69.htm
;-)
>
[snip]
....
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
Well, I'm not Bill, and this link isn't irrelevant, but if you REALLY
need to see some links, try this:
http://www.madsci.org/posts/archives...2326.Eg.r.html
or this:
http://www.tpub.com/eqopbas/69.htm
;-)
>
[snip]
....
09-09-2006, 02:52 PM
#248
Guest
Posts: n/a
Re: Jeep Toad
On Sat, 09 Sep 2006 10:36:46 -0700, Lon <lon.stowell@comcast.net>
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
>
>L.W.(Bill) ------ III proclaimed:
>
>> That is so.... WRONG it's overwhelming! So I'll just eliminate the
>> maxies, for the others that may believe in this group, They use air
>> pressure to release the parking brakes they are not used in stopping! I
>> think that most people could tell by the number of gauges we have to
>> monitor that if a part like disk brakes could be used safely we would
>> have them on our half a million dollar tractors:
>> http://www.----------.com/kenworthdash.jpg
>> God Bless America, Bill O|||||||O
>> mailto:--------------------
>>
>> Simon Juncal wrote:
>>
>>>mabar wrote:
>>>
>>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>>semi-trucks use drum brakes?
>>>>
>>>>I also am curious - why do they use drums rather than disks?
[snip]
(Sorry to add into the thread at this point, but...)
Just found this web page stating that air disk brakes could be better
than drums:
http://trailer-bodybuilders.com/mag/...sults_support/
....
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
>
>L.W.(Bill) ------ III proclaimed:
>
>> That is so.... WRONG it's overwhelming! So I'll just eliminate the
>> maxies, for the others that may believe in this group, They use air
>> pressure to release the parking brakes they are not used in stopping! I
>> think that most people could tell by the number of gauges we have to
>> monitor that if a part like disk brakes could be used safely we would
>> have them on our half a million dollar tractors:
>> http://www.----------.com/kenworthdash.jpg
>> God Bless America, Bill O|||||||O
>> mailto:--------------------
>>
>> Simon Juncal wrote:
>>
>>>mabar wrote:
>>>
>>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>>semi-trucks use drum brakes?
>>>>
>>>>I also am curious - why do they use drums rather than disks?
[snip]
(Sorry to add into the thread at this point, but...)
Just found this web page stating that air disk brakes could be better
than drums:
http://trailer-bodybuilders.com/mag/...sults_support/
....
09-09-2006, 02:52 PM
#249
Guest
Posts: n/a
Re: Jeep Toad
On Sat, 09 Sep 2006 10:36:46 -0700, Lon <lon.stowell@comcast.net>
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
>
>L.W.(Bill) ------ III proclaimed:
>
>> That is so.... WRONG it's overwhelming! So I'll just eliminate the
>> maxies, for the others that may believe in this group, They use air
>> pressure to release the parking brakes they are not used in stopping! I
>> think that most people could tell by the number of gauges we have to
>> monitor that if a part like disk brakes could be used safely we would
>> have them on our half a million dollar tractors:
>> http://www.----------.com/kenworthdash.jpg
>> God Bless America, Bill O|||||||O
>> mailto:--------------------
>>
>> Simon Juncal wrote:
>>
>>>mabar wrote:
>>>
>>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>>semi-trucks use drum brakes?
>>>>
>>>>I also am curious - why do they use drums rather than disks?
[snip]
(Sorry to add into the thread at this point, but...)
Just found this web page stating that air disk brakes could be better
than drums:
http://trailer-bodybuilders.com/mag/...sults_support/
....
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
>
>L.W.(Bill) ------ III proclaimed:
>
>> That is so.... WRONG it's overwhelming! So I'll just eliminate the
>> maxies, for the others that may believe in this group, They use air
>> pressure to release the parking brakes they are not used in stopping! I
>> think that most people could tell by the number of gauges we have to
>> monitor that if a part like disk brakes could be used safely we would
>> have them on our half a million dollar tractors:
>> http://www.----------.com/kenworthdash.jpg
>> God Bless America, Bill O|||||||O
>> mailto:--------------------
>>
>> Simon Juncal wrote:
>>
>>>mabar wrote:
>>>
>>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>>semi-trucks use drum brakes?
>>>>
>>>>I also am curious - why do they use drums rather than disks?
[snip]
(Sorry to add into the thread at this point, but...)
Just found this web page stating that air disk brakes could be better
than drums:
http://trailer-bodybuilders.com/mag/...sults_support/
....
09-09-2006, 02:52 PM
#250
Guest
Posts: n/a
Re: Jeep Toad
On Sat, 09 Sep 2006 10:36:46 -0700, Lon <lon.stowell@comcast.net>
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
>
>L.W.(Bill) ------ III proclaimed:
>
>> That is so.... WRONG it's overwhelming! So I'll just eliminate the
>> maxies, for the others that may believe in this group, They use air
>> pressure to release the parking brakes they are not used in stopping! I
>> think that most people could tell by the number of gauges we have to
>> monitor that if a part like disk brakes could be used safely we would
>> have them on our half a million dollar tractors:
>> http://www.----------.com/kenworthdash.jpg
>> God Bless America, Bill O|||||||O
>> mailto:--------------------
>>
>> Simon Juncal wrote:
>>
>>>mabar wrote:
>>>
>>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>>semi-trucks use drum brakes?
>>>>
>>>>I also am curious - why do they use drums rather than disks?
[snip]
(Sorry to add into the thread at this point, but...)
Just found this web page stating that air disk brakes could be better
than drums:
http://trailer-bodybuilders.com/mag/...sults_support/
....
wrote:
>And of course the current system of truck brakes is so wonderful and
>reliable that all those emergency dump lanes full of sand are merely a
>figment of everyone [but Bill's] imagination.
>
>PS. Did I miss Bill's obligatory irrelevant link?
>
>L.W.(Bill) ------ III proclaimed:
>
>> That is so.... WRONG it's overwhelming! So I'll just eliminate the
>> maxies, for the others that may believe in this group, They use air
>> pressure to release the parking brakes they are not used in stopping! I
>> think that most people could tell by the number of gauges we have to
>> monitor that if a part like disk brakes could be used safely we would
>> have them on our half a million dollar tractors:
>> http://www.----------.com/kenworthdash.jpg
>> God Bless America, Bill O|||||||O
>> mailto:--------------------
>>
>> Simon Juncal wrote:
>>
>>>mabar wrote:
>>>
>>>>So far in this thread, nobody has answered Jeff's question: Why do
>>>>semi-trucks use drum brakes?
>>>>
>>>>I also am curious - why do they use drums rather than disks?
[snip]
(Sorry to add into the thread at this point, but...)
Just found this web page stating that air disk brakes could be better
than drums:
http://trailer-bodybuilders.com/mag/...sults_support/
....