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I am helping a friend with a problem similar to this. No obvious leaks and the brake pedal settles to the floor. I refilled the brake fluid reservoir and when he restarted the engine on the truck, roughly half of the brake fluid was pulled in out of the reservoir. I checked the vacuumn line from the brake booster and it appeared dry, so is it reasonable to assume that the master cylinder leaked fluid into the booster – on the other side of the diaphragm from the vacuum line? I plan to replace the master cylinder. What, if anything, should I do about the brake fluid in the booster? (This is a 1995 Ford F150 w/4.9L)
I am helping a friend with a problem similar to this. No obvious leaks and the brake pedal settles to the floor. I refilled the brake fluid reservoir and when he restarted the engine on the truck, roughly half of the brake fluid was pulled in out of the reservoir. I checked the vacuumn line from the brake booster and it appeared dry, so is it reasonable to assume that the master cylinder leaked fluid into the booster – on the other side of the diaphragm from the vacuum line? I plan to replace the master cylinder. What, if anything, should I do about the brake fluid in the booster? (This is a 1995 Ford F150 w/4.9L)