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Tom · 11-30-2006

The first one that I had leak, leaked at the booster but on mine the fluid ran down the front of the booster and I could see the fluid level dropping in the reservoir and the trail of brake fluid down. The second one that I had leak had the fluid coming out around the switch on the valve as well as the fluid level dropping in one reservoir and increasing in the other. I didn't bother rebuilding the first one, just replaced it, the second one failed shortly after I installed it so it was still under warrany so it was just replaced as well.

I work with hydraulic components in my current job and sometimes it takes a lot of work to find why a part is leaking. Small, tiny flaws on the seal surfaces that can cause leaks are sometimes very difficult to find. Putting the surface you are inspecting under tension while inspecting the seal usually helps. On some seals I have had to use a microscope at 10 to sometimes 30 magnification to find the flaws in a seal.

Flaws in the bores of small diameter cylinders can be even worse since you don't have very good access to look at the surface. If you have no plans to ever do anything with the leaking cylinder you can cut it in half lengthwise so you can find the problem. I have done this with cylinders where I couldn't find the problem any other way.

11-30-2006	#9
Tom Join Date: Jan 2004 Location: Southern CA Posts: 108	Re: master cylinder for 90 ZR1 The first one that I had leak, leaked at the booster but on mine the fluid ran down the front of the booster and I could see the fluid level dropping in the reservoir and the trail of brake fluid down. The second one that I had leak had the fluid coming out around the switch on the valve as well as the fluid level dropping in one reservoir and increasing in the other. I didn't bother rebuilding the first one, just replaced it, the second one failed shortly after I installed it so it was still under warrany so it was just replaced as well. I work with hydraulic components in my current job and sometimes it takes a lot of work to find why a part is leaking. Small, tiny flaws on the seal surfaces that can cause leaks are sometimes very difficult to find. Putting the surface you are inspecting under tension while inspecting the seal usually helps. On some seals I have had to use a microscope at 10 to sometimes 30 magnification to find the flaws in a seal. Flaws in the bores of small diameter cylinders can be even worse since you don't have very good access to look at the surface. If you have no plans to ever do anything with the leaking cylinder you can cut it in half lengthwise so you can find the problem. I have done this with cylinders where I couldn't find the problem any other way.