Brake Problems (2 wheel drive) on 2001 GMC Sierra 3500

Brake pedal goes to the floor when applying. I have new rotors and pads all away round the truck, new master cylinder, but the brake pedal still goes to the floor when applying the brake.

by in District Heights, MD on June 14, 2011
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2 answers 1 comment
ANSWER by , June 14, 2011
Everything - including the master cylinder itself - needs to be re-bled. Start with the master cylinder - bench bleed it. Then bleed each wheel. Then repeat each wheel to be sure.
COMMENT by , June 15, 2011
Already bleed brakes and master cylinder quite a few times and pedal still goes to the floor when applying the brakes.
ANSWER by , March 02, 2016
Having the same problem with my 2001 sierra 3500 . did all the same things , but same results. Checking to see if it something to do with the ABS system . If I find the problem their I will let you know . Need Help.