Update: sinking brake pedal (not stinking)...
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Elder User
Joined: May 2008
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Update: sinking brake pedal (not stinking)...
for a long time I've been wrestling with a slowly sinking brake pedal. No leaks anywhere, all relatively new components, lines, MC, WC's, and calipers. So I've been looking at the fluid levels in the MC and found the problem. It looks like over time, fluid moves from the larger reservoir for the front brakes (the one closest to firewall) to the smaller reservoir for the rear brakes. So the MC must have some internal valve failure. It's not an air thing - there is no air in my system. Interesting - this was a new Raybestos MC from less than three years ago, and fresh fluid.
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Elder User
Joined: May 2008
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I don't think the vacuum booster shouldn't have anything to do with a sinking pedal. It gives symptoms of a hard pedal (when not working), because the 'assist' isn't there all the time. My experience with them...
Cargo Master
Joined: Apr 2009
Posts: 3,038
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From: South west Idaho
A couple of my 79s had the power unit go bad and do that. But it sounds like you have a master cylinder problem,fluid should not transfer from one bowl to the other. The cheap parts made now days can go bad right after you instal them. I think you have a cylinder problem.
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