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American Motors/79 CJ 7 master cylinder leaking...

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Expert: Kevin Pilotte - 7/28/2008


Question
I just bought a 79 cj7. My husband took the master cylinder cap off to check the fluid. Now, we have problems with the cap leaking.  We have tried the following: check seal, bar, and cap. All seem fine. Put a washer, fuel line hose, and heater hose between the cap and bar on top.  Finally, bought a reman cylinder and took the cap and gasket off. Put it on the old master cyl. Still leaks.  tried tweaking the bar even. still leaks out of the cap. Had several people look at it and everyone is clueless.  doesn't have too much fluid, only leaks when drive down road a ways. any suggestions?

Answer
Is the push rod aadjusted properly? If it too far out, it could prevent the master cylinder from releasing.
Also, is there any possible way the brake fluid is contaminated with something? Oil in the fluid would make the rubber gasket soften & swell.

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Kevin Pilotte

Expertise

I can answer many technical questions relating to AMC vehicles prior to 1979. I also have experience with Rambler & Nash vehicles.

Experience

I am a former AMC technician, service writer and service manager. I have worked in AMC dealers in Illinois in the 70's. After college, I was a Field Service Rep for American Motors Sales Corporation, working out of the Chicago Zone office. I traveled to AMC dealers assisting in the diagnosis and repair of AMC vehicles. I was also the Area Training Manager for DeLorean Motor Company. I have 10+ years as an Automotive Instructor. I have modified and restored
numerous AMC vehicles. I have been working on AMC vehicles for over 30 years.

Organizations
I have been an ASE Certified Master Technician since 1975. This includes L1. I am also currently a Toyota Certified Master Diagnostic Technician.

Publications
I have articles in "American Motoring", the official publication of the American Motors Owners Association. They are the largest AMC club in the world.

Education/Credentials
I have a certificate I printed out from a website.

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