Question about 1999 GMC Envoy
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Posted on Jan 02, 2017
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
ALL YOU CAN DO IS FLUSH WITH CLEAN FLUID PUMP AND BLEED NOTE: ALWAYS START FROM THE FURTHEST WHEEL FROM THE MASTER CYLINDER AND WORK YOU WAY BACK. SOME TIMES YOU CAN OPEN THE LINES WITH COMPRESSED AIR WHEN YOU DISCONNECT ALL THE LINES FROM THE CYLINDERS
Posted on Aug 16, 2009
SOURCE: tried to bleed brakes after
Usually, its not the master cylinder, but you may have air in the master cylinder. Get another person to help you bleed the brakes. Make sure the master cylinder is full of fluid and loosen the bleeder screw at the caliper. have the other person slowly depress the brake pedal. When the pedal is all the way to the floor then you need to tighten the bleeder screw and have the other person slowly let the brake pedal up. You will need to repeat this procedure several times before you will see any fluid coming out of the caliper.
Posted on Dec 18, 2010
SOURCE: Replaced all brake lines, rear
It sounds as though where the rear brake lines meet up with the master cylinder; there is probably a piece of dirt in the lines that could be blocking any fluid from getting in. To test this, I would remove the brake lines from the master cylinder and then remove the master cylinder. Once done, have the master cylinder cleaned inside out. This will remove the dirt particles that are clogging your lines.
Posted on Aug 22, 2011
SOURCE: Have a GMC 2004 XUV
Your truck is equipped with what is called an active ABS brake system, this means the brakes system is pressurized by a hydraulic brake control block that has a powerful electric motor that pump brake fluid into what is called a brake fluid pressure accumulator. The ABS system also contains a traction control system which is able to apply brake pressure to the individual wheels to stop wheel spin or skidding or release pressure. What this all means is the ABS/Traction Control System can apply the brakes without you ever touching the pedal, the pressure is applied through very strong pressure "POP-IT" valves, these valves can stick and this causes the brakes to be applied and burns up the brake pads and rotors very quickly. In order to correct this the ABS hydraulic control valve under the hood (block with all the brake lines connected to it) is defective and will need to be replaced to correct this problemin most cases. This problem may not set any codes or trun on any warning lights like the ABS or Traction control lights. The module requires special tools to replace and bleed out the air, so it must be done at a well equipped brake shop. The part comes in remanufactured form, here is the part number and the price of the ABS Hydraulic control unit (GM calls it the ABS Modulator valve). There are two parts to the system, the valve and the control unit, either may be the cause of the problem, its part number is also below.
I would replace both parts as one repair.
ABS Modulator Valve
ACDELCO Part # 89027152
VALVE,BRK PRESS MOD 4 WHEEL DRIVE; w/4 WHL DISC BRK(JF8)
VALVE,BRK PRESS MOD 2 WHEEL DRIVE; w/4 WHL DISC BRK(JF8); w/o Traction Control(NW7) $303.79 (price source is www.rockauto.com)
ABS Control Module
ACDELCO Part # 10356388
MODULE,ELEK BRK CONT 4 WHEEL DRIVE; w/4 WHL DISC BRK(JF8)
MODULE,ELEK BRK CONT 2 WHEEL DRIVE; w/4 WHL DISC BRK(JF8); w/o Traction Control(NW7) $232.89
Posted on Sep 17, 2011
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