Brake Problem-98 GMC Suburban

While driving home this evening, brake pedal went to the floor. Sounded like there was an air leak coming from the rod going into the firewall to the master cylinder. Seemed like it was affecting my engine idle, rpm needle kept dropping when applying pressure. My neighbor took the vacuum hose off the booster. Seemed like the pedal got a little more stiff. None the less, I have no braking power. Doc or White Lightning? You have helped me numerous times before. This doesn't sound like something I can fix if its the master cylinder. My neighbor is a pretty good mechanic. Thanks folks.

Reply to
Scott1966
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With hose off pedal should have been hard as a rock, worse than an old car with manual brakes. When booster really goes bad pedal gets hard, same as hose off. It is possible that because the pedal went to the floor the booster was damaged, very slight possibility, but possible none the less. you left out important info, like is there fluid in the master cylinder reservoir, is one end empty and if so which end? have you looked at the wheels, especially the inside of the rear ones for signs of leakage(blown wheel cylinders tend to soak the wheel/tire). also if it was low, but no signs of leakage at wheels look at the booster below the master, if the master has been leaking out the back it runs down the booster and the paint goes to snot. also unbolt master from booster and pull foreword, look for leakage on back side. If its been leaking long enough it will build up in the booster and can damage the diaphragm. This is more of a problem on Hondas and other ricers as they use a natural rubber diaphragm, and Honda says master leak, replace booster. sooo much fun to do on an Accord, not. Whitelightning

Reply to
Whitelightning

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