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Dragging Disc Brakes
have an (new to me w/29k mi.) '02 Liberty on which the front brakes
rotors seem VERY hot after long term run. The calipers are seemingly not unloading correctly. Questions: € Whats the best way to remove the friction in the disc brake system so that these can unload properly? .... removing the dust covers and applying a proper caliper grease? .... lubricating the piston seals? etc. € Can the old caliper piston dust covers be reinstalled or does one normally destroy them when removing? € What would the correct amount of piston 'preload' be so that there is 'enough' residual piston pressure to hold the brake pad 'close enough' to the rotor but NOT cause significant drag ..... dont want to get into brake vacuum booster preload - yet. Advice appreciated. Thanks for your reply. RichH |
Re: Dragging Disc Brakes
Usually you want to lube up the pins that the caliper slides on as well
as the slide bars it slides along with high temp brake grease. There should be a nylon sleeve in there. The parts 'shouldn't' be throw away, so the dust cover should go back on easy enough. If they both are doing it, then it might just be the nature of the pad material. Some drag is normal and most rotors get hot enough to burn your finger within a very few miles. There is no preset on the piston, it re-sets every time you hit the brakes. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Rich Hampel wrote: > > have an (new to me w/29k mi.) '02 Liberty on which the front brakes > rotors seem VERY hot after long term run. The calipers are seemingly > not unloading correctly. > > Questions: > € Whats the best way to remove the friction in the disc brake system so > that these can unload properly? .... removing the dust covers and > applying a proper caliper grease? .... lubricating the piston seals? > etc. > € Can the old caliper piston dust covers be reinstalled or does one > normally destroy them when removing? > € What would the correct amount of piston 'preload' be so that there is > 'enough' residual piston pressure to hold the brake pad 'close enough' > to the rotor but NOT cause significant drag ..... dont want to get into > brake vacuum booster preload - yet. > > Advice appreciated. Thanks for your reply. > > RichH |
Re: Dragging Disc Brakes
Usually you want to lube up the pins that the caliper slides on as well
as the slide bars it slides along with high temp brake grease. There should be a nylon sleeve in there. The parts 'shouldn't' be throw away, so the dust cover should go back on easy enough. If they both are doing it, then it might just be the nature of the pad material. Some drag is normal and most rotors get hot enough to burn your finger within a very few miles. There is no preset on the piston, it re-sets every time you hit the brakes. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Rich Hampel wrote: > > have an (new to me w/29k mi.) '02 Liberty on which the front brakes > rotors seem VERY hot after long term run. The calipers are seemingly > not unloading correctly. > > Questions: > € Whats the best way to remove the friction in the disc brake system so > that these can unload properly? .... removing the dust covers and > applying a proper caliper grease? .... lubricating the piston seals? > etc. > € Can the old caliper piston dust covers be reinstalled or does one > normally destroy them when removing? > € What would the correct amount of piston 'preload' be so that there is > 'enough' residual piston pressure to hold the brake pad 'close enough' > to the rotor but NOT cause significant drag ..... dont want to get into > brake vacuum booster preload - yet. > > Advice appreciated. Thanks for your reply. > > RichH |
Re: Dragging Disc Brakes
Usually you want to lube up the pins that the caliper slides on as well
as the slide bars it slides along with high temp brake grease. There should be a nylon sleeve in there. The parts 'shouldn't' be throw away, so the dust cover should go back on easy enough. If they both are doing it, then it might just be the nature of the pad material. Some drag is normal and most rotors get hot enough to burn your finger within a very few miles. There is no preset on the piston, it re-sets every time you hit the brakes. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Rich Hampel wrote: > > have an (new to me w/29k mi.) '02 Liberty on which the front brakes > rotors seem VERY hot after long term run. The calipers are seemingly > not unloading correctly. > > Questions: > € Whats the best way to remove the friction in the disc brake system so > that these can unload properly? .... removing the dust covers and > applying a proper caliper grease? .... lubricating the piston seals? > etc. > € Can the old caliper piston dust covers be reinstalled or does one > normally destroy them when removing? > € What would the correct amount of piston 'preload' be so that there is > 'enough' residual piston pressure to hold the brake pad 'close enough' > to the rotor but NOT cause significant drag ..... dont want to get into > brake vacuum booster preload - yet. > > Advice appreciated. Thanks for your reply. > > RichH |
Re: Dragging Disc Brakes
Usually you want to lube up the pins that the caliper slides on as well
as the slide bars it slides along with high temp brake grease. There should be a nylon sleeve in there. The parts 'shouldn't' be throw away, so the dust cover should go back on easy enough. If they both are doing it, then it might just be the nature of the pad material. Some drag is normal and most rotors get hot enough to burn your finger within a very few miles. There is no preset on the piston, it re-sets every time you hit the brakes. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Rich Hampel wrote: > > have an (new to me w/29k mi.) '02 Liberty on which the front brakes > rotors seem VERY hot after long term run. The calipers are seemingly > not unloading correctly. > > Questions: > € Whats the best way to remove the friction in the disc brake system so > that these can unload properly? .... removing the dust covers and > applying a proper caliper grease? .... lubricating the piston seals? > etc. > € Can the old caliper piston dust covers be reinstalled or does one > normally destroy them when removing? > € What would the correct amount of piston 'preload' be so that there is > 'enough' residual piston pressure to hold the brake pad 'close enough' > to the rotor but NOT cause significant drag ..... dont want to get into > brake vacuum booster preload - yet. > > Advice appreciated. Thanks for your reply. > > RichH |
Re: Dragging Disc Brakes
As Mike said: check the caliper pins to make sure the calipers are "free
floating. Remove, clean, lube with the special high temp lube avialable in small tubes at the auto parts store. Rich Hampel wrote: > have an (new to me w/29k mi.) '02 Liberty on which the front brakes > rotors seem VERY hot after long term run. The calipers are seemingly > not unloading correctly. > > Questions: > € Whats the best way to remove the friction in the disc brake system so > that these can unload properly? .... removing the dust covers and > applying a proper caliper grease? .... lubricating the piston seals? > etc. > € Can the old caliper piston dust covers be reinstalled or does one > normally destroy them when removing? > € What would the correct amount of piston 'preload' be so that there is > 'enough' residual piston pressure to hold the brake pad 'close enough' > to the rotor but NOT cause significant drag ..... dont want to get into > brake vacuum booster preload - yet. > > Advice appreciated. Thanks for your reply. > > RichH |
Re: Dragging Disc Brakes
As Mike said: check the caliper pins to make sure the calipers are "free
floating. Remove, clean, lube with the special high temp lube avialable in small tubes at the auto parts store. Rich Hampel wrote: > have an (new to me w/29k mi.) '02 Liberty on which the front brakes > rotors seem VERY hot after long term run. The calipers are seemingly > not unloading correctly. > > Questions: > € Whats the best way to remove the friction in the disc brake system so > that these can unload properly? .... removing the dust covers and > applying a proper caliper grease? .... lubricating the piston seals? > etc. > € Can the old caliper piston dust covers be reinstalled or does one > normally destroy them when removing? > € What would the correct amount of piston 'preload' be so that there is > 'enough' residual piston pressure to hold the brake pad 'close enough' > to the rotor but NOT cause significant drag ..... dont want to get into > brake vacuum booster preload - yet. > > Advice appreciated. Thanks for your reply. > > RichH |
Re: Dragging Disc Brakes
As Mike said: check the caliper pins to make sure the calipers are "free
floating. Remove, clean, lube with the special high temp lube avialable in small tubes at the auto parts store. Rich Hampel wrote: > have an (new to me w/29k mi.) '02 Liberty on which the front brakes > rotors seem VERY hot after long term run. The calipers are seemingly > not unloading correctly. > > Questions: > € Whats the best way to remove the friction in the disc brake system so > that these can unload properly? .... removing the dust covers and > applying a proper caliper grease? .... lubricating the piston seals? > etc. > € Can the old caliper piston dust covers be reinstalled or does one > normally destroy them when removing? > € What would the correct amount of piston 'preload' be so that there is > 'enough' residual piston pressure to hold the brake pad 'close enough' > to the rotor but NOT cause significant drag ..... dont want to get into > brake vacuum booster preload - yet. > > Advice appreciated. Thanks for your reply. > > RichH |
Re: Dragging Disc Brakes
As Mike said: check the caliper pins to make sure the calipers are "free
floating. Remove, clean, lube with the special high temp lube avialable in small tubes at the auto parts store. Rich Hampel wrote: > have an (new to me w/29k mi.) '02 Liberty on which the front brakes > rotors seem VERY hot after long term run. The calipers are seemingly > not unloading correctly. > > Questions: > € Whats the best way to remove the friction in the disc brake system so > that these can unload properly? .... removing the dust covers and > applying a proper caliper grease? .... lubricating the piston seals? > etc. > € Can the old caliper piston dust covers be reinstalled or does one > normally destroy them when removing? > € What would the correct amount of piston 'preload' be so that there is > 'enough' residual piston pressure to hold the brake pad 'close enough' > to the rotor but NOT cause significant drag ..... dont want to get into > brake vacuum booster preload - yet. > > Advice appreciated. Thanks for your reply. > > RichH |
Re: Dragging Disc Brakes
Convert to four piston calibers like used on the old Mustang:
http://www.----------.com/68MustangCaliber.jpg Otherwise know stock calibers will always drag and create heat. God Bless America, Bill O|||||||O mailto:-------------------- Rich Hampel wrote: > > have an (new to me w/29k mi.) '02 Liberty on which the front brakes > rotors seem VERY hot after long term run. The calipers are seemingly > not unloading correctly. > > Questions: > € Whats the best way to remove the friction in the disc brake system so > that these can unload properly? .... removing the dust covers and > applying a proper caliper grease? .... lubricating the piston seals? > etc. > € Can the old caliper piston dust covers be reinstalled or does one > normally destroy them when removing? > € What would the correct amount of piston 'preload' be so that there is > 'enough' residual piston pressure to hold the brake pad 'close enough' > to the rotor but NOT cause significant drag ..... dont want to get into > brake vacuum booster preload - yet. > > Advice appreciated. Thanks for your reply. > > RichH |
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