Question about 2000 GMC Envoy

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Front brakes I have had several issues with my brakes. The front brakes (especially driver side) gets hot and smokes but is not leaking anything. We have bled the brakes, replaced the brakes, replaced hose lines and calipers. Was told it could be master cylinder but with what I have found it does not seem like that. It seems like brake pressure wont release unless the car sits awhile and then is okay for a short distance then acts up again. Today i had to almost floor the gas just to get it up to 40 because it dropped from 55 to about 40 on its own and the rpms sky rocketed. I was also told it could be the abs proportioning valve but from what i have been reading they are for the rear brakes. can someone help me please?

Posted by brit s on

  • brit s Jun 25, 2013

    for some reason its like the brakes do what they want. if i remove my foot from gas on an incline it actually stops and sits there, i dont even have to touch the brake. any clue whats going on?



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john h

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If the proportioning clogs or damaged it can cause brake problems such as yours take pressure readings on all 4 calipers the proportioning valve is just as it says differentiates the pressure front to back also the abs unit itself can cause the same problem also

Posted on Jun 26, 2013

Testimonial: "thats kinda what we were thinking so we actually unplugged the abs to see if it made a difference and its still messing up. we are gonna flush the brake system and see what that does and plug the abs back in. i do believe the abs unit is a salvage part. its been wrote on with a yellow marking saying 2000 blazer and i know it wouldnt come out stock like that so maybe its already had issues with the abs before we bought it. ive dumped atleast the same amount of money into it as i paid and its costing me like $80 a week in gas to go to and from work which is only about 12 minutes away so its robbing the gas mileage bad"


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SOURCE: 1986 gmc sierra 1500 front rt brake locks up

check brake lines they may have gotten pinched very commonok new c/k trucks when you crank the torsion bars up to far you may have hit something and pinched the brake line check those before messing with the master cylinder those are a real pain

Posted on Sep 21, 2008



  • 266 Answers

SOURCE: replaced both front calipers, rotors,

The best way to bleed the brakes is to start with the master cylinder and work your way back. after you are sure all the air is out of the master, got to the rear and open one bleed screw. do not touch the brake pedal ,but let the fluid drain, keeping the master cylinder full, untill the fluid comes out clear,like new. Close that side and go to the other rear wheel and repeat. After the rear is done close all beed screws and pump the brakes at least 10 times .Then bleed the front in a normal fashion. Try to close the bleed screw before the brake pedal hits the floor.If you still have air in brake system then there has to be a leak letting it in. Gravity brake bleeding is the easiest way to remove air in system

Posted on Mar 23, 2011

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