Question about 1996 GMC Sierra
Step on brake pedal and air leaks out from the shaft that goes in through the fire wall to the master cylinder .
1. Check brake fluid level and look for leaks in the brake lines and at the calipers.
2. Bleed the brake fluid completely and replace with fresh fluid (google search: how to bleed brakes). Then bleed air by having someone press the brake pedal 4-5 times, then press and hold while you open the bleed valve and close when fluid streams out. start with the rear wheel (if 4wheel disc brakes) then move to the front.
3. Replace Master Cylinder (sorry, but if 1 or 2 didn't fix it, this is the last option) This is usually over $150, and will involve step 2 again when completed.
Good luck, hope this helps.
Posted on Sep 29, 2009
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Posted on Jan 02, 2017
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