push rod for master cylinder may be a few mm too long, thus when booster applies vacuum brakes are applied lightly and this causes heat and subsequent fluid boil over. you rule out sicking caliper but at the age of your truck it may be worth a second and closer look, hoses may be collapsing internally. you may want to consider replacing calipers and flushing the entire system with fresh fluid.
88 RRC Brake Failure
Driving along after say 30min and brake peddle went to floor, was able to pump it up after 5 to 8 pumps, to to pull to left. No leaks and full of fluid. Changed master cylinder (original) and felt fine. Went for drive 30min (longest drive since rr master cyl) and peddle went to floor, was able to pump up and no leaks. Cooled off 45min then was OK again until after about 15 to 30 min no peddle again. Same as before with original master cyl. If piston was sticking it would pull to one side but still have hard peddle. And why only when it gets warm. Is it possible barke line getting hot? Please help its dangerous to drive... Thanks
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I would look for a vacuum leak engaging the brakes slightly while driving. Mine has similar issues. I hear it’s not uncommon for 1988.
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Brilliant. I will try shortening rod and see what happens. Thanks
Good brakes again. Thanks a million
Did you shorten the rod? Any pics of the process?
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the rod has a short thread which can be adjusted, a turn yields vast results. be careful if too long you may end up with locked brakes when hot or high revs due to vacuum boost or no brakes at all due rod too short. test before road testing and make sure your emergency brake is working and well adjusted before a road test and have an emergency stopping plan, do not panic.Did you shorten the rod? Any pics of the process?
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FIXED
It was the right front caliper seizing up
It was the right front caliper seizing up
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