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Brake help 88 GMC sierra

Was leaking brake fluid from rear cylinder. Changed that. Bled brakes. But now the pedal goes to floor and can't even pump them up while driving. As I pump, the reservoir bubbles. Please help to find what I can do.

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There is a leak in the system and air is being introduced. if you cant find the leak in line with the plumbing or at one of the calipers or wheel cylinders then a faulty brake booster or torn boot could be the issue. it is also possible you didnt properly bleed all the air out. bleed each wheel until new clear fluid with no spurts or air bubbles comes out to be sure

Posted on Oct 15, 2013

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There's still air on you system!

Posted on Oct 15, 2013


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Posted on Jan 02, 2017

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SOURCE: 1998 chevy s10- brake pedal goes to the floor-

Did you put fresh fluid in the master cylinder? I really think you still have air in the lines. To bleed manually, start with the bleeder the greatest distance from the master cylinder, car running, helper pushing down about half way on brake pedal and releasing 3 times, on 3rd time, holding pedal down to half way depressed point while you open the bleeder valve. Repeat until you are sure all air has been flushed out. Check master cyl reservoir level often, because if it gets low and you **** air into the system, you have to start all over again. Go to wheel next greatest distance from master cyl, repeat above, working your way to wheel closest to master cyl last.

Posted on Apr 12, 2009

emissionwiz
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SOURCE: brake pedal dropping to floor

do u have the antilock brake bleeding tool? if not you will need to have the dealer bleed the brakes, the ABS control valve must be electricaly held open to bleed the brakes there of course is a special tool for this.

Posted on Oct 18, 2009

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SOURCE: I Hanve 1996 GMC 1500

did you try a brake booster ?

Posted on Oct 10, 2010

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