italie |
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MAME owes italie many thank yous, hah
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Reged: 09/20/03
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Posts: 15246
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Loc: BoomTown
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Re: Another fine moment of "What the hell was someone thinking"
08/31/11 10:22 PM
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> So someone prior to you owning this sealed a leak with RTV? Looks like a trip to the
> junkyard is in order. I have never seen a brake booster fail before. I'll bet the one
> on the Yukon is the same for Chevy trucks too. You will have to check that out.
Nah, worse. They replaced the master cylinder, and in the process they must have lost the push rod that goes between the booster and the master cylinder. The booster has a hollowed out piston that the push rod sits in, and the push rod makes up for a small gap between the booster and master pistons. They RTV'd between the master and the booster, and the seal was tight enough for air to actuate the master piston before the booster piston made contact with it. The minute the booster piston hit the master you'd get a jerky increase in stopping power.
The car always had a spongy pedal in the first inch or so. Never could seem to bleed it out. Mystery solved on that one I guess.
The booster itself was bad, diaphragm ripped. You could hear the "Whoosh" every time the brake was stepped on, and the pedal turned to rock after that 1st inch.
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Re: Another fine moment of "What the hell was someone thinking"
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