i’m working on a 2000 chevy tahoe 4×4 4 wheel abs?

this truck came in about a month ago with low brake pedal found bad master cyl. installed remaned. fallowed all specs for bleeding brakes including it being done with scanner. about a week later the truck is back same symptoms. suspected faulty master cyl. and i hit the nail on the head. but this time i replaced it with a new master cyl. again i fallowed all specs again i got a very good pedal. again about week later he comes back same symptoms. i don’t under stand why the pedal keeps going away. first i should mention the truck sits on 38″ tires has a 6″ body lift and 6″ all brake hoses have been replaced due to lift suspension lift any help on this would be a big help i’m at my wits end with it please help

, , , ,

3 Responses to i’m working on a 2000 chevy tahoe 4×4 4 wheel abs?

  1. ray p June 8, 2009 at 11:58 am #

    if this is a drum brake vehicle,are the rears losing adjustment,or not adjusted up enough or is fluid have high enough DOT #,just a thought

  2. bangorpaguy June 8, 2009 at 11:58 am #

    You might need a different master cylinder. With the added length to the brake lines the original one might not be able to keep the pressure required because of the longer brake lines.

  3. Chev M June 8, 2009 at 11:58 am #

    i would say you need to different master cylinder and one that reqires higher brake pressure because of the lift uinstalledwith reqires more pressure and volume to go though cause what is happening is your blowing out the primary and possible secondary seals