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Thread: Rear brake sticking on

  
  1. #1
    6 PSI Boost spt87a's Avatar
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    Apr 2020
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    Sandwich, MA
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    SVO's: 1986 1C, sunroof

    Rear brake sticking on

    Hi - been searching the forums for brake info and found some good stuff - but still have questions.

    Passenger side rear brake just started getting stuck on. Not all the time - started right after driving on a wet road. Next day it was fine. Randomly did it again today and then it resolved on its own after about 30 minutes (dry out and hot).

    After the first time - pulled the wheel and caliper. Everything looked ok but I removed the pads and rotor, wire brushed the guides that the pads slide on, put a thin layer of brake grease on the guides and reinstalled everything. It has SS braided brake lines already which are not too old and not many miles.

    I did notice that the locating pins which hold the caliper on slide thru rubber sleeves (referred to as an insulator in the service manual). These rubber insulators are badly deteriorated and are basically just a goo that has partially hardened on the pins with the rest a gooey mess in the caliper insulator/pin bores.

    I've ordered new rubber insulators for all 4 wheels (assuming they are all deteriorated - only looked at one wheel so far). Could this gooey rubber be the cause of the brake sticking? Doesn't really look like the caliper moves/slides on that pin but maybe this is a factor?

    Or maybe the caliper just has an internal problem. The parking brake does work and I use it regularly. Cable is in good shape but maybe the parking mechanism within the caliper is not releasing - is that possible/likely? Just wondering if I need to buy a caliper(s).

  2. #2
    OVER-BOOST!! svono50's Avatar
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    Apr 2002
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    Streamwood, IL
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    SVO's: 86 1C
    If the insulators are gone, then that could be part of the problem, where they just are not moving as much as they should and allowing the pads to release. One quick way to check if the insulators are causing movement issues is install the caliper w/o the pads and see how easily it slides back and forth on the pins moving it by hand (don't pump your breaks w/o the pads!). If the 'gooey' insulators do not allow the caliper to slide smoothly on the pins, then your replacements should help the situation. If they don't impede the sliding movement, then you may have a caliper that requires replacement/rebuild, likely due to corrosion on the piston. Personally, with the age of our cars/brakes, I would recommend replacement.
    Ted
    86 SVO Mustang
    17 Cooper S Clubman ALL4

  3. #3
    6 PSI Boost spt87a's Avatar
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    SVO's: 1986 1C, sunroof
    Ok, thanks Ted. I'd say in that case the insulators then are big factor so I'll replace them and see how it is without swapping more parts. I'll try your test when I have it apart again though.

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