Sierra 2001 ne freine pas du devant.

[Offtrack]

Gmc sierra 2001 4x4 4.8l
-Le véhicule freine tranquillement,
-la pédale est loin,
-on peux ententes galipers du derrière travailler,
-les galipers avant sont neuf
-tout les lignes ont été saigné du plus loin du master au plus proche,
-J'ai retirer la fuse abs et essayer et tout reste pareil,
-le véhicule ne baise pas du tout du devant en freinant,
J'ai effectué tout ces test et ils sont tous correcte:

[bobbylog]

essaye de bleeder au master directement en premier

Hydraulic Brake System Bleeding (Pressure)

Tools Required

• J 29532 Diaphragm Pressure Bleeder, or equivalent

• J 35589-A Brake Pressure Bleeder Adapter

Warning! Refer to Brake Fluid Irritant Caution in the Preface section.
Caution! Refer to Brake Fluid Effects on Paint and Electrical Components Notice in the Preface section.
Caution!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.

1. Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
2. With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve.
3. If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps:
   3.1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
   If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal.
   
   3.2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder.
   3.3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder.
   3.4. Reconnect the brake pipe to the master cylinder port and tighten securely.
   3.5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
   3.6. Loosen the same brake pipe to purge air from the open port of the master cylinder.
   3.7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.
   3.8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder.
   3.9. With the front brake pipe installed securely to the master cylinder, after all air has been purged from the front port of the master cylinder, loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8.
   3.10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened.
4. 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.Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
5. Install the J 35589-A to the brake master cylinder reservoir.
6. Check the brake fluid level in the J 29532 , or equivalent. Add Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container as necessary to bring the level to approximately the half-full point.
7. Connect the J 29532 , or equivalent, to the J 35589-A .
8. Charge the J 29532 , or equivalent, air tank to 175-205 kPa (25-30 psi).
9. Open the J 29532 , or equivalent, fluid tank valve to allow pressurized brake fluid to enter the brake system.
10. Wait approximately 30 seconds, then inspect the entire hydraulic brake system in order to ensure that there are no existing external brake fluid leaks. Any brake fluid leaks identified require repair prior to completing this procedure.
11. Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
12. Install a transparent hose over the end of the bleeder valve.
13. Submerge the open end of the transparent hose into a transparent container partially filled 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.
14. Loosen the bleeder valve to purge air from the wheel hydraulic circuit. Allow fluid to flow until air bubbles stop flowing from the bleeder, then tighten the bleeder valve.

[bobbylog]

La suite

1. With the right rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right rear hydraulic circuit, install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve.
2. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.
3. With the left rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the left rear hydraulic circuit, install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve.
4. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.
5. With the right front wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right front hydraulic circuit, install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
6. Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.
7. After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened.
8. Close the J 29532 , or equivalent, fluid tank valve, then disconnect the J 29532 , or equivalent, from the J 35589-A .
9. Remove the J 35589-A from the brake master cylinder reservoir.
10. 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.
11. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
12. If the brake pedal feels spongy perform the following steps:
    26.1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection .
    26.2. Using a scan tool, perform the antilock brake system automated bleeding procedure to remove any air that may have been trapped in the brake pressure modulator valve (BPMV). Refer to Antilock Brake System Automated Bleed Procedure .
13. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.ImportantIf the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
14. If the brake system warning lamp remains illuminated, refer to Symptoms - Hydraulic Brakes .

[Offtrack]

On viens de me parler de faire un ABS break bleed

[bobbylog]

On dirait bien que sa prend un scan tool... Tech 2

Antilock Brake System Automated Bleed Procedure

Two Person Procedure

Important

• Use the two-person bleed procedure under the following conditions:

- Installing a new Electro-Hydraulic Control Unit (EHCU) or new Brake Pressure Modulator Valve (BPMV)

- Air is trapped in the valve body

• Do not drive the vehicle until the brake pedal feels firm.

• Do not reuse brake fluid that is used during bleeding.

• Use the vacuum, the pressure and the gravity bleeding procedures only for base brake bleeding.

1. Raise the vehicle in order to access the system bleed screws.
2. Bleed the system at the right rear wheel first.
3. Install a clear hose on the bleed screw.
4. Immerse the opposite end of the hose into a container partially filled with clean DOT 3 brake fluid.
5. Open the bleed screw 1/2 to one full turn.
6. Slowly depress the brake pedal. While the pedal is depressed to its full extent, tighten the bleed screw.
7. Release the brake pedal and wait 10-15 seconds for the master cylinder pistons to return to the home position.
8. Repeat the previous steps for the remaining wheels. The brake fluid which is present at each bleed screw should be clean and free of air.
9. This procedure may use more than a pint of fluid per wheel. Check the master cylinder fluid level every four to six strokes of the brake pedal in order to avoid running the system dry.
10. Press the brake pedal firmly and run the Scan Tool Automated Bleed Procedure. Release the brake pedal between each test.
11. Bleed all four wheels again using Steps 3-9. This will remove the remaining air from the brake system.
12. Evaluate the feel of the brake pedal before attempting to drive the vehicle.
13. Bleed the system as many times as necessary in order to obtain the appropriate feel of the pedal.

[Terreur350]

check tes hoses à brake avant en caoutchout, la bage de retenu doit les comprimer par la rouille et ainsi reduire le debit d'huile transmis au galiper avant. Probleme récurant....

[Pokin]

Envoyé par Terreur350

check tes hoses à brake avant en caoutchout, la bage de retenu doit les comprimer par la rouille et ainsi reduire le debit d'huile transmis au galiper avant. Probleme récurant....

x2 ... sa arrive souvent ! toutes marques confondu...