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General Category => Maintenance => Topic started by: 427 chevelle on May 26, 2012, 02:57:59 PM

Title: caliper rebuild help needed
Post by: 427 chevelle on May 26, 2012, 02:57:59 PM
i am rebuilding the stock calipers on my 85,the problem is i cant get the pistons out with compressed air.any ideas?
Title: Re: caliper rebuild help needed
Post by: FJ111200 on May 26, 2012, 03:08:28 PM
Try your normal brake fluid action. Usualy works sooner or later after pumping.
Title: Re: caliper rebuild help needed
Post by: RichBaker on May 29, 2012, 10:00:25 PM
Bleeders closed and applying the air thru the banjo bolt hole?  I've seen grease from a grease gun used as a last resort, but it was a bitch to clean up....
Title: Re: caliper rebuild help needed
Post by: FeralJuggernaut on May 30, 2012, 11:04:12 PM
Had something like this once.   One comes out and the other was 'stuck'.  I put the loose piston back in.   Safety wired both pistons in and left a rag between them.    You'll likely see that the jammed one is in ever so slightly crooked.   Try to seat it back in squarely if you can.   up the air in 5 psi increments until you hear the 'PING' noise.   :D   Watch where you hold on and keep fingers clear!  My next step was going to be penetrating oil, but the air got it.
Title: Re: caliper rebuild help needed
Post by: Dr. Jay on June 03, 2012, 06:18:42 AM
My solution to a similar problem was like FeralJuggernaut's with one (in my case) important addition. I pushed the sticky piston all the way into the caliper using a big C clamp and then used ultra-fine bronze wool to clean the grunge out of the caliper which was above the seal on the poston, but previously hidden by the rim of the piston. At that point the air was able to push it out.

Good Luck!