Having problems with your 2000 Chevrolet Tahoe ?

What causes brakes to be engauged at all times to the point of overheating wheels and causing a wobble the front end. this problem is happening on a 2000 tahoe

Posted / edited by AnonymousUser on : 13-08-2018

Answers :

This problem is caused by a defective ABS (anti0Lock Brakes) hydraulic control valve,this system is what is called "Active" ABS, this means the system has an electric pump that keeps the system pressurized all the time, and when needed the ABS computer opens up high pressure pop-it valves in the ABS hydraulic control block and send pressure to the appropriate wheel to control skidding and prevent uneven braking, the is the block with all the brake linen coming out of it under the hood, It is defective and leaking pressure to the brakes, to replace this and get the air bled out takes a special ABS bleeding tool at the dealer.
OK, there could be air in the system. Air and hydraulic fluid will cause bubbles that exert pressure on the brakes at all times:
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\015\012Bleeding the ABS System\015\012W/O JL4\015\012CAUTION
When adding fluid to the brake master cylinder reservoir, use only Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.
\015\012CAUTION
This procedure may be performed on all vehicles EXCEPT those equipped with option code JL4, Vehicle Stability Enhancement System (VSES).
\015\012CAUTION
The base hydraulic brake system must be bled before performing this automated bleeding procedure. If you have not yet performed the base hydraulic brake system bleeding procedure, refer to Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure) in Hydraulic Brakes before proceeding.
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  1. Install a scan tool to the vehicle. \015\012
  2. Start the engine and allow to idle. \015\012
  3. Depress the brake pedal firmly and maintain pressure on the pedal. \015\012
  4. Using the scan tool, begin the automated bleed procedure. \015\012
  5. Follow the instructions on the scan tool to complete the automated bleed procedure. Release the brake pedal between each test sequence. \015\012
  6. Turn the ignition OFF. \015\012
  7. Remove the scan tool from the vehicle. \015\012
  8. Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. \015\012
  9. Bleed the hydraulic brake system. \015\012
  10. With the ignition OFF apply the brakes 3-5 times, or until the brake pedal becomes firm, to deplete the brake booster power reserve. \015\012
  11. Slowly depress and release the brake pedal. \015\012
  12. If the brake pedal feels spongy, repeat the automated bleeding procedure. If the brake pedal still feels spongy after repeating the automated bleeding procedure, inspect the brake system for leaks. \015\012
  13. Turn the ignition key ON, with the engine OFF; check to see if the brake system warning lamp remains on. \015\012
  14. If the brake system warning lamp remains on, DO NOT allow the vehicle to be driven until it is diagnosed and repaired. \015\012
  15. Drive the vehicle to exceed 13 kph (8 mph) to allow ABS initialization to occur. \015\012
  16. Observe brake pedal feel. \015\012
  17. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake pedal is obtained.
\015\012W/ JL4\015\012CAUTION
When adding fluid to the brake master cylinder reservoir, use only Delco Supreme 11 GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.
\015\012CAUTION
The following procedures may be performed on vehicles equipped with option code JL4, Vehicle Stability Enhancement System (VSES).
\015\012Pre-charge Bleed\015\012The Pre-charge bleed procedure is to be performed when air may have been introduced into the precharge pump inlet hose, the precharge pump or the combination valve. Perform the procedure as follows.
\015\012CAUTION
If the brake system warning lamp is illuminated. DO NOT allow the vehicle to be driven until the concern is diagnosed and repaired. Refer to Symptoms - Hydraulic Brakes in Hydraulic Brakes.
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    \015\012
  1. Ensure that the master cylinder reservoir is filled to at least the minimum-fill level with Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid from a clean, sealed container. \015\012
  2. Ensure the master cylinder reservoir cap is ON. \015\012
  3. Install a scan tool. \015\012
  4. Turn the ignition ON. \015\012
  5. Select the VSES Special Functions menu on the scan tool. \015\012
  6. Select Pre-charge Bleed. \015\012
  7. Press the On key. The precharge pump runs for approximately 3 seconds. \015\012
  8. Evaluate the feel of the brake pedal. If the pedal feels spongy, bleed the hydraulic brake system. \015\012
  9. Ensure that the master cylinder reservoir is filled to at least the minimum-fill level with Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid from a clean, sealed container.
\015\012Automated Bleed\015\012The Automated Bleed procedure is to be performed when the Brake Pressure Modulator Valve (BPMV) is replaced. Perform the procedure as follows.
\015\012CAUTION
The base brake system must be bled before proceeding. Refer to Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure) in Hydraulic Brakes.
\015\012CAUTION
If the brake system warning lamp is illuminated, DO NOT allow the vehicle to be driven until the concern is diagnosed and repaired. Refer to Symptoms - Hydraulic Brakes in Hydraulic Brakes.
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    \015\012
  1. Ensure that the master cylinder reservoir is filled to at least the minimum-fill level with Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid from a clean, sealed container. \015\012
  2. Ensure the master cylinder reservoir cap is ON securely. \015\012
  3. Install a scan tool. \015\012
  4. Turn ON the ignition. \015\012
  5. Select the VSES Special Functions menu on the scan tool. \015\012
  6. Select Pre-charge Bleed. \015\012
  7. Press the On key. The precharge pump runs for approximately 3 seconds, circulating fluid from the master cylinder fluid reservoir, through the precharge pump and combination valve, then back to the master cylinder. \015\012
  8. Select Automated Bleed. \015\012
  9. Press the On key. The precharge pump and ABS pump run for approximately 6 seconds while air is purged from the BPMV. \015\012
  10. Ensure that the master cylinder reservoir is filled to at least the minimum-fill level with Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid from a clean, sealed container. \015\012
  11. Perform a base brake system bleed. Refer to Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure) in Hydraulic Brakes. \015\012
  12. Evaluate the feel of the brake pedal. If the pedal feels spongy, repeat steps 1-11. If the pedal feel is acceptable, proceed to the next step. \015\012
  13. Ensure that the master cylinder reservoir is filled to at least the minimum-fill level with Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid from a clean, sealed container.
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\015\012Other systems which may cause the symptoms you describer are the Brake Pressure Modulator Valve, Electronic Brake Control Module.
\015\012That's all there is to you system, bleeding, BPMV, and the EBCM.
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\015\012(besides the speed sensor and Toner (Exciter) Ring
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Repair Help & Product Troubleshooting for 2000 Chevrolet Tahoe

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