Brake Fluid Leak

Q: Brake Fluid Leak

Last week I noticed my brake pedal almost hit the floor before I had any “pressure”. I didnt’ find any brake fluid leaks anywhere except a very small trace under this “unknown” assembly. Rebleed the brakes and found the front left had alot of air in it. Drove it a week, then noticed this a.m. that there was a small puddle under the car. Traced it back to this “unknown assembly” I have power disc and the car is a 1969 This part is mounted onto the bracket that holds the master cylinder to the booster. (note: the master was just rebuilt a few months ago). There is one brake tube from the front of the master to this “part” and then a brake tube off it to the proportioning valve (rectanglar part). The part is round 2.5 to 3 cm diameter (or 1.25 “) and about 6cm long (or 2.5”). There appears to be a rubber boot on the end facing the booster. Fluid is possibly leaking from the front.

A: I had a weird problem that went on for years until I finally stumbled onto the solution. Fluid was leaking out the top back of the reservoir, emptying the front disk brake section of the cylinder. My front disk brakes would fade every week and had to rebleed. I had the master rebuilt and replaced the cap but the problem continued. No fluid leakage was visible on any other assembly or hoses (which I also replaced). Finally I rebuilt the disk calipers and the problem stopped. Air was getting in through the wheel cylinders and somehow pushing fluid back out the master giving the appearnce of leak there. Go figure!

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