Gotta problem, I need HELP!
My 01 2500hd has a brake issue. My ABS and brake light came on awhile back. Soon after that I pressed the pedal extremely hard. The pedal went to the floor!!! I replaced the master cylinder and blead the lines twice. THe pedal STILL can be pressed to the floor. Any idea why???

 

Have you checked for any leaks along the lines and fittings?

 

Yes, I have checked all the lines. Depressed the pedal and looked for bubbled lines, Nothing!

 

How about your caliper piston seals, have you checked if they are any good?

 

W/the ABS light on i would check out codes before buying anymore parts.

 

If your brake pedal goes to the floor then you definitely have a problem. If it were an older car, the brake master cylinder ora leaking system (a puddle of fluid under the carwillcertainly indicatea leaky system) might be the cause. Because it's not an old car I would think about properly bleeding the system. If it still goes to the floor I would have it looked at by a trained mechanic, you don't want tofiddle aroundwith your braking system unless you have the technical know-how.
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Satified Chevrolet Trailblazer owner