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I took all four wheels off myself and didn’t notice anything strange, no leaks, nothing wet, etc. So I brought the car to a local mechanic and he also can’t find an issue. So I figured maybe just replace the master cylinder and go from there? The car is a 1991 N/A non-ABS rx7. I still have pressure in the system and the car still stops. He said the brakes still had over 50% life left and would pass inspection and everything looks good there.
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[quote=”celticbhoy” post=52502]It’d be the master cylinder’s secondary cup seal on the primary piston that’s leaking onto the booster. The booster connects to the master cylinder by a pushrod. If you see fluid on the booster shell or even the appearance of the boosters paint eaten away then that’s the issue. Did you thoroughly check all of the line fittings going into the calipers or wheel cylinders? Really hope for your sake it’s not the ABS module.[/quote]
Yes we went through everything and there is no sign of leaks anywhere near or around the calipers. My car doesn’t have ABS.
[quote=”EricTheCarGuy” post=52492]I didn’t think you’d notice anything by removing the vacuum hose for that very reason. Personally, I’d unbolt the master from the booster and see if it’s leaking there. You don’t have to disconnect the brake lines, you can just unbolt the master and pull it forward to have a look. It wouldn’t be the booster that’s leaking anyway, it would be the master cylinder leaking INTO the booster. If it’s not leaking there it may be leaking into the ABS. I have seen some systems do this when a valve in the ABS goes bad. Keep us posted.[/quote]
We did remove the brake master and there was no signs of leaks there. We replaced the master cylinder and it still seems to be leaking but far less than before. It’s been well over a week and I’ve lost the smallest amount of fluid. Barely even noticeable. Car doesn’t have ABS.
You may not be loosing fluid. As the front brake pads wear the fluid level will drop in the master cylinder due to the fluid filling the space behind the caliper piston. If you’ve gone through all that and still haven’t found a leak I would suggest this very thing. Monitor the situation but I think you’re OK. Keep us posted.
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