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Car Fanatic. Technical Novice.
Brake Fluid Leak?
My car is currently up on a rack getting new coolant hoses installed. After removing the fuel tank cover, it's been discovered that something has eaten away the epoxy on the hidden side of the cover. It's all bubbled and eaten away. Has anyone else experienced this? I'm thinking the master cylinder is leaking, but I didn't have time to really look into it. Would this diagnosis make sense?
Previous Owner of 5875 - 1981/Grey/5-Speed/Grooved Hood
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Senior Member
Originally Posted by
pezzonovante88
My car is currently up on a rack getting new coolant hoses installed. After removing the fuel tank cover, it's been discovered that something has eaten away the epoxy on the hidden side of the cover. It's all bubbled and eaten away. Has anyone else experienced this? I'm thinking the master cylinder is leaking, but I didn't have time to really look into it. Would this diagnosis make sense?
Don't start thinking of the worst possible.
A PO or his service shop may have been spilling fluid while changing or filling up.
That happened on my car too.
If the bottom of the brake main cylinder is dry, suspect spilling.
Welmoed
Black D 1981-11 sold
Toyota Prius III 2009-07 (sold)
Mazda MX-30 (BEV) 2020-09
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Guy with a DeLorean
Last edited by Mark D; 05-08-2013 at 04:30 PM.
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If you are not losing fluid, ie, the level is not going down and you have to add brake fluid, this damage could be from an old leak and the cylinder was replaced already. If you do not see any brake fluid and you aren't leaking any, just remove all of the loose epoxy and repaint the frame and plate.
David Teitelbaum
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My friends think I'm nuts
It's so funny how all these cars have the same exact issues. On mine the only spot of rust the whole frame long is right in this exact spot, and it was clearly from an old leaking master as the vacuum booster has drip damage on it as well (under the brand new shiny master). One day I'll get around to cleaning this up too!
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Same here.
Spent some time under the car today. Discovered the brake leak same way, dropped the gas tank to clean, saw the destruction below. On mine it appears to be a resivoir leak. Res sits inside of 2 rubber grommets in the master. Only evident current leaking seems to have come from the front one of these. Res. slid in and out of the grommets much too easily for my taste. Just startin to research if and how these are replaceable, or does it require a new MC. Meantime- tommorrow its under the car again, this time with a putty knife to scrap off the bubbled frame paint. Anybody replaced these grommets before, and are they even avail.?---- Thanks.
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Rare for them to fail, they usually leak because they got damaged during installation. They can be replaced without replacing the master if you can get just the seals.
David Teitelbaum
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Brake res. rubber grommets
Only visible leakage was from below the res. at the front grommet. Resivoir pulled out much too easy, Should have been at least a bit of resistance. Car has been sitting inside garage for a long time. South Texas sun gets temps well over 100 almost every day in the summer in the garage. Guessing-- hoping, they shrunk or hardened from the climate. As I said drip pattern was directly under, any dampness remaining was right under the res. Now to try to find the replacements-- no luck so far.
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Guy with a DeLorean
DeLorTex, I've got two reservoir seals that I could remove from my old brake master and ship to you. I bought one of the new units from DMCH so my original master cyl is sitting on a shelf. I can't promise their condition is in much better shape than yours though. The master itself was pretty rusty and pitted inside which is why I replaced it. It didn't appear to be leaking from the connection points to the reservoir though. If you're interested the seals are yours at no charge.
Otherwise I always seem to have luck calling DMCMW for parts like this that aren't normally sold separately.
Last edited by Mark D; 05-09-2013 at 01:04 PM.
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Senior Member
Originally Posted by
pezzonovante88
...it's been discovered that something has eaten away the epoxy on the hidden side of the cover. It's all bubbled and eaten away. Has anyone else experienced this?
This is so commonplace that the question should almost be "has anyone NOT experienced this?" I had my fair share of it from a PO but it's been cleaned up since. Last month when I did a brake job, every drop I spilled tried to find its way back to this very spot...
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