New Brake Master Cylinder Leaking from Cap
#1
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Location: Eastern Long Island, NY
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Year: 1996
Model: Cherokee
Engine: I6 Cyl / 4L
New Brake Master Cylinder Leaking from Cap
I installed a new brake master cylinder 2 months ago and now it is leaking from the cap, I think. I also changed the proportioning valve with a new one from the dealer, and I also did a new booster.
The new master cylinder had been sitting in my basement for the past 5 years, as I took a long time to get to this fix.
The brakes feel great. I have a smooth brake pedal with range and good incremental stopping power. But now I am leaking brake fluid. Any suggestions? Thanks.
The new master cylinder had been sitting in my basement for the past 5 years, as I took a long time to get to this fix.
The brakes feel great. I have a smooth brake pedal with range and good incremental stopping power. But now I am leaking brake fluid. Any suggestions? Thanks.
#2
Old fart with a wrench
I would suggest the neoprene seal in the cap has dried out and has a crack in it. There is a squirt of brake fluid every time you hit the pedal before the pistons seal off the relief ports that can be forceful and hit the top of the reservoir. A small crack can allow some fluid to leak out then. Problem is, I have no idea where to get a new seal. I'm surprised the piston seals are still good after sitting for 5 years!
Last edited by dave1123; 03-09-2020 at 08:58 PM.
The following users liked this post:
318SixPack (03-10-2020)
The following users liked this post:
318SixPack (03-10-2020)
#4
CF Veteran
I do know if you don't remove the cap when pushing in the calipers, it will push out.
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