Master Cylinder Diaphragm
Thread Starter
Instructor
Joined: Jun 2005
Posts: 135
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Master Cylinder Diaphragm
Should the Master Cylinder Diaphragm be recessed (flat) or elongated when replacing the reservoir cap? When I took it off to check the fluid level, the two rubber "circles" were fully elongated although the fluid level was fine. The shop manual says nothing. I believe the diaphragm serves as a fluid level compensator when the brakes are applied. I also believe the mechanics pushed the diaphragm flat when re-installing the cover on other cars I have owned, but I'm not positive. What is the correct position for the diaphragm? Also, is there any way short of buying a new cover to regain the original cad plate finish to the cover?
