After doing my motor mounts everything was fine,
till this evening.

When I back up at speed (or even rev the engine in
reverse with the brakes applied) the ABS pump comes on
and I can feel it in the brake pedal.

Never had that happen before. Didn't know the pump
would come on without the brakes being depressed or
when the wheels were static.

Gonna check in the morning to see if I knocked
something loose. But a quick glance doesn't indicate
anything wrong. I may have leaned on the ABS computer
connector and need to clean/reattach it. But that's a
long shot.

--
DougW

 

That is wierd. sorry I dont have an answer.
KH

"DougW" <post.replies@invalid.address> wrote in message
news:kYepd.102293$tU4.79603@okepread06...
> After doing my motor mounts everything was fine,
> till this evening.
>
> When I back up at speed (or even rev the engine in
> reverse with the brakes applied) the ABS pump comes on
> and I can feel it in the brake pedal.
>
> Never had that happen before. Didn't know the pump
> would come on without the brakes being depressed or
> when the wheels were static.
>
> Gonna check in the morning to see if I knocked
> something loose. But a quick glance doesn't indicate
> anything wrong. I may have leaned on the ABS computer
> connector and need to clean/reattach it. But that's a
> long shot.
>
> --
> DougW
>
>
>

 

That is wierd. sorry I dont have an answer.
KH

"DougW" <post.replies@invalid.address> wrote in message
news:kYepd.102293$tU4.79603@okepread06...
> After doing my motor mounts everything was fine,
> till this evening.
>
> When I back up at speed (or even rev the engine in
> reverse with the brakes applied) the ABS pump comes on
> and I can feel it in the brake pedal.
>
> Never had that happen before. Didn't know the pump
> would come on without the brakes being depressed or
> when the wheels were static.
>
> Gonna check in the morning to see if I knocked
> something loose. But a quick glance doesn't indicate
> anything wrong. I may have leaned on the ABS computer
> connector and need to clean/reattach it. But that's a
> long shot.
>
> --
> DougW
>
>
>

 

That is wierd. sorry I dont have an answer.
KH

"DougW" <post.replies@invalid.address> wrote in message
news:kYepd.102293$tU4.79603@okepread06...
> After doing my motor mounts everything was fine,
> till this evening.
>
> When I back up at speed (or even rev the engine in
> reverse with the brakes applied) the ABS pump comes on
> and I can feel it in the brake pedal.
>
> Never had that happen before. Didn't know the pump
> would come on without the brakes being depressed or
> when the wheels were static.
>
> Gonna check in the morning to see if I knocked
> something loose. But a quick glance doesn't indicate
> anything wrong. I may have leaned on the ABS computer
> connector and need to clean/reattach it. But that's a
> long shot.
>
> --
> DougW
>
>
>

 

I'm betting one of the ABS sensors or the wiring to the sensors was
damaged while installing the new motor mounts.... I'd look at the front
ABS sensors mounted onto each brake assembly very closely for any signs
of damage.

Jerry

Kevin in San Diego wrote:
> That is wierd. sorry I dont have an answer.
> KH
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:kYepd.102293$tU4.79603@okepread06...
>
>>After doing my motor mounts everything was fine,
>>till this evening.
>>
>>When I back up at speed (or even rev the engine in
>>reverse with the brakes applied) the ABS pump comes on
>>and I can feel it in the brake pedal.
>>
>>Never had that happen before. Didn't know the pump
>>would come on without the brakes being depressed or
>>when the wheels were static.
>>
>>Gonna check in the morning to see if I knocked
>>something loose. But a quick glance doesn't indicate
>>anything wrong. I may have leaned on the ABS computer
>>connector and need to clean/reattach it. But that's a
>>long shot.
>>
>>--
>>DougW
>>
>>
>>
>
>
>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/

 

I'm betting one of the ABS sensors or the wiring to the sensors was
damaged while installing the new motor mounts.... I'd look at the front
ABS sensors mounted onto each brake assembly very closely for any signs
of damage.

Jerry

Kevin in San Diego wrote:
> That is wierd. sorry I dont have an answer.
> KH
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:kYepd.102293$tU4.79603@okepread06...
>
>>After doing my motor mounts everything was fine,
>>till this evening.
>>
>>When I back up at speed (or even rev the engine in
>>reverse with the brakes applied) the ABS pump comes on
>>and I can feel it in the brake pedal.
>>
>>Never had that happen before. Didn't know the pump
>>would come on without the brakes being depressed or
>>when the wheels were static.
>>
>>Gonna check in the morning to see if I knocked
>>something loose. But a quick glance doesn't indicate
>>anything wrong. I may have leaned on the ABS computer
>>connector and need to clean/reattach it. But that's a
>>long shot.
>>
>>--
>>DougW
>>
>>
>>
>
>
>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/

 

I'm betting one of the ABS sensors or the wiring to the sensors was
damaged while installing the new motor mounts.... I'd look at the front
ABS sensors mounted onto each brake assembly very closely for any signs
of damage.

Jerry

Kevin in San Diego wrote:
> That is wierd. sorry I dont have an answer.
> KH
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:kYepd.102293$tU4.79603@okepread06...
>
>>After doing my motor mounts everything was fine,
>>till this evening.
>>
>>When I back up at speed (or even rev the engine in
>>reverse with the brakes applied) the ABS pump comes on
>>and I can feel it in the brake pedal.
>>
>>Never had that happen before. Didn't know the pump
>>would come on without the brakes being depressed or
>>when the wheels were static.
>>
>>Gonna check in the morning to see if I knocked
>>something loose. But a quick glance doesn't indicate
>>anything wrong. I may have leaned on the ABS computer
>>connector and need to clean/reattach it. But that's a
>>long shot.
>>
>>--
>>DougW
>>
>>
>>
>
>
>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.***.net/jerrypb/

 

Jerry Bransford did pass the time by typing:
> I'm betting one of the ABS sensors or the wiring to the sensors was
> damaged while installing the new motor mounts.... I'd look at the front
> ABS sensors mounted onto each brake assembly very closely for any signs
> of damage.

Gonna do those today as the wheels get rotated.

> Kevin in San Diego wrote:
>> That is wierd. sorry I dont have an answer.

Morning light and a fresh cup o joe later.......

I think it's the supercharger bumping up against the brake
booster when the engine torques in reverse. That in turn
transmits vibration to the ABS speed sensor mounted in the
same area and tricking the ABS into activating.

The old mounts had sunk about 1/4" and were rock hard. The
new ones haven't sunk under engine load yet and are still
nice and spongy.

Long story short, I should have replaced the transmission mount.
Crawled under the ZJ this morning (DANG COLD GARAGE FLOOR!!!)
and found out it's shot also. I think that replacing that mount
will level out the engine and give me better clearance.

...I hope..
...I hope..

Now off to track down parts.

--
DougW
(and his mostly fixed ZJ)

 

Jerry Bransford did pass the time by typing:
> I'm betting one of the ABS sensors or the wiring to the sensors was
> damaged while installing the new motor mounts.... I'd look at the front
> ABS sensors mounted onto each brake assembly very closely for any signs
> of damage.

Gonna do those today as the wheels get rotated.

> Kevin in San Diego wrote:
>> That is wierd. sorry I dont have an answer.

Morning light and a fresh cup o joe later.......

I think it's the supercharger bumping up against the brake
booster when the engine torques in reverse. That in turn
transmits vibration to the ABS speed sensor mounted in the
same area and tricking the ABS into activating.

The old mounts had sunk about 1/4" and were rock hard. The
new ones haven't sunk under engine load yet and are still
nice and spongy.

Long story short, I should have replaced the transmission mount.
Crawled under the ZJ this morning (DANG COLD GARAGE FLOOR!!!)
and found out it's shot also. I think that replacing that mount
will level out the engine and give me better clearance.

...I hope..
...I hope..

Now off to track down parts.

--
DougW
(and his mostly fixed ZJ)

 

Jerry Bransford did pass the time by typing:
> I'm betting one of the ABS sensors or the wiring to the sensors was
> damaged while installing the new motor mounts.... I'd look at the front
> ABS sensors mounted onto each brake assembly very closely for any signs
> of damage.

Gonna do those today as the wheels get rotated.

> Kevin in San Diego wrote:
>> That is wierd. sorry I dont have an answer.

Morning light and a fresh cup o joe later.......

I think it's the supercharger bumping up against the brake
booster when the engine torques in reverse. That in turn
transmits vibration to the ABS speed sensor mounted in the
same area and tricking the ABS into activating.

The old mounts had sunk about 1/4" and were rock hard. The
new ones haven't sunk under engine load yet and are still
nice and spongy.

Long story short, I should have replaced the transmission mount.
Crawled under the ZJ this morning (DANG COLD GARAGE FLOOR!!!)
and found out it's shot also. I think that replacing that mount
will level out the engine and give me better clearance.

...I hope..
...I hope..

Now off to track down parts.

--
DougW
(and his mostly fixed ZJ)