I have done everything atleast dozen times and 2 gallons of brake fluid.No leaks.No loss of fluid.3 new m/c's.It good for about 2 miles and then the brakes become soft.And there's air in the front resev.Back brake are good.
Air in m/c
- Thread starter jwej1965
- Start date
Molson02536
New member
To bleed the brakes and ABS properly you will need a scan tool with bidirectional controls such as a Tech2. I'm not sure if a Snap On will do it or not. If you don't have access to one, you will need to take it to a technician.
Automated Bleed 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.
Two Person Procedure
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 resent 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 (all except diesels above 15,000 GVW) once, or run the Function Test (diesels above 15,000 GVW) four times. 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.
Bleed the system as many times as necessary in order to obtain the appropriate feel of the pedal.
Here is a TSB about the ground:
TECHNICAL
Bulletin No.: 04-05-25-002E
Date: March 11, 2009
Subject:
ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground)
Models
Supercede:
This bulletin is being revised to add step 2 to the procedure and update the Parts and Warranty Information. Please discard Corporate Bulletin Number 04-05-25-002D (Section 05 - Brakes).
Condition
Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module.
Cause
A poor connection at the EBCM ground is causing unnecessary replacement of brake modules.
Important:
The EBCM ground is different for each application. Refer to the list below for the proper ground reference:
^Midsize Utilities = Ground 304
^SSR = Ground 400
^Fullsize Trucks and Utilities = Ground 110
Correction
Important:
Do not replace the brake module to correct this condition. Perform the following repair before further diagnosis of the EBCM.
Perform the following steps to improve the connection of the EBCM Ground:
1. Remove the EBCM Ground. The EBCM Ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire.
2. If the original fastener has a welded on nut, remove the nut from the frame, and if required, enlarge the bolt hole to accommodate the new bolt and nut.
3. Clean the area, front and back, using a tool such as a *3M™ Scotch-Brite Roloc disc or equivalent.
4. Install the ground, then the washer and then the bolt to the frame.
Important:
It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish.
5. Install a washer and nut to the back side of the frame.
Tighten
Tighten the nut to 9 Nm (79 lb in).
6. Cover the front and back side of the repair area using Rubberized Undercoating.
An additional check can be made to ensure a good connection for the battery cable to frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above.
I had this problem but I simply cleaned the grounding point and sealed it from the elements. The problem hasn't returned since.
Hope this helps, and keep us posted.
