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Thread: Stuck caliper and master cylinder piston

  1. #1
    Join Date
    Feb 2020
    Location
    US
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    57

    Stuck caliper and master cylinder piston

    Hey guys. I'm starting a revitalization project on my 85 200x. It sat mostly idle for 12 years in a shed on a friend's property. Digging into the brakes, and have stuck pistons on both front and rear calipers and the rear master cylinder. Any ideas from the gurus out there?

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  2. #2
    Join Date
    Jul 2009
    Location
    South Florida
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    6,722
    Can force them out by using a grease gun screwed into the banjo bolt hole .
    A little heat if needed .
    Their are special pliers for removing caliper pistons .
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  3. #3
    Join Date
    Apr 2011
    Location
    Mexico
    --
    9,003
    Compressed air can work too, but make sure to protect your eyes and wrap the caliper with a towel or rags before you blast air into them. I like to push them in a little with a C clamp to break them free first.

  4. #4
    Join Date
    Apr 2014
    Location
    Edmond, KS
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    2,531
    I just ran into this on a 1983 Goldwing. I did like El Camexican said and used a c clamp to push them a little bit first. I got the pistons to move out a little bit with compressed air. I sprayed a little WD-40 on them before I pushed them in again. Then I sprayed some inside the caliper through the banjo bolt hole. I did this thinking that it would help lube up the old, dry seals. It seemed to help. I worked them back and forth several times.

  5. #5
    Join Date
    May 2006
    Location
    The Open Road
    --
    4,729
    I loosened the bleeder on calipers, took a grease gun with and plugged the end right onto the nipple in the bleeder and pumped grease in there until the pistons popped out.... Then I cleaned the grease out of the caliper and reinstall new seals.

  6. #6
    Join Date
    Feb 2020
    Location
    US
    --
    57
    Quote Originally Posted by shortline10 View Post
    Can force them out by using a grease gun screwed into the banjo bolt hole .
    A little heat if needed .
    Their are special pliers for removing caliper pistons .
    Thanks for the tips.

    Sent from my SM-G960U using Tapatalk

  7. #7
    Join Date
    Feb 2020
    Location
    US
    --
    57
    Quote Originally Posted by El Camexican View Post
    Compressed air can work too, but make sure to protect your eyes and wrap the caliper with a towel or rags before you blast air into them. I like to push them in a little with a C clamp to break them free first.
    Thanks for the advice. I was able to push them in a bit with a clamp.

    Sent from my SM-G960U using Tapatalk

  8. #8
    Join Date
    Feb 2020
    Location
    US
    --
    57
    Quote Originally Posted by 350for350 View Post
    I just ran into this on a 1983 Goldwing. I did like El Camexican said and used a c clamp to push them a little bit first. I got the pistons to move out a little bit with compressed air. I sprayed a little WD-40 on them before I pushed them in again. Then I sprayed some inside the caliper through the banjo bolt hole. I did this thinking that it would help lube up the old, dry seals. It seemed to help. I worked them back and forth several times.
    Thanks for answering. I'll keep after it.

    Sent from my SM-G960U using Tapatalk

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