1990 GMC Sierra lack of brake pressure

1990 GMC SIERRA
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DANS84
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Brakes problem
1990 GMC Sierra Four Wheel Drive Automatic

I have a friend who had a new master cylinder put on a year ago and he doesn't get enough pressure from his brakes to lock up his brakes while stopping anytime, not that he wants to lock up his brakes. . The brake lines were run so that the ABS system was bypassed. He needs the brakes so that when he pulls his trailer he can stop better. Can you help us figure out his problem?
Mar 7, 2010 at 7:11 PM
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JACOBANDNICKOLAS
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Are the rear brakes properly adjusted? Also, when you bypass the ABS, it does change the integrity of the system. I question if that has something to do with it.

Let me know about adjustment.
Mar 16, 2010 at 8:09 AM