If the brakes don't pull or there is no excessive wheel lockup with the fuse out, look for signal dropout in one of the wheel speed sensors. I decided my Tahoe was a freak with a hidden lung by the time we were done. For example; losing control of your vehicle. I only drive the suburban a few miles a day right now and I am looking for the cheapest alternative. This mode displays and erases trouble codes. This unit maintains the appropriate hydraulic pressure when braking is needed; When your cars computer senses any particular wheel is spinning faster than another via traction and stability control signals. Just connect the meter at the sensor connector and rotate the wheel by hand.
Now that's a sobering thought, isn't it? Replaced pads and brake shoe, same problem. Could you please tell me what's wrong. J39177 to hold open the high-pressure accumulator bleed valves. Bleed all four wheels again using Steps 3 - 9. The resistance of this sensor should be between 900 and 2000 ohms.
The brake fluid which is present at each bleed screw should be clean and free of air. This testing includes the pump and the control valves. Removal of the rotor is required for replacement. When the brakes were applied, this vehicle pulled to the left so hard that the customer had it towed to a shop. Never bottom out the master cylinder or push caliper pistons back in during routine brake service. That means it may be days or even weeks after the fix that the customer returns with a spongy brake pedal complaint, not to mention one unhappy disposition.
If a brake pull is felt, suspect a problem in the conventional braking system. The vehicle in questions is our family's only transpo, so I have no choice. A scan tool will be required since flash codes are not available on these systems. Although some applications have four wheel speed sensors, if one rear wheel locks, hydraulic pressure to both rear wheels will be reduced. If the rear end ratio or tire diameter has been changed, the buffer should be replaced with one calibrated for these factors.
Hopefully I will have more success trying this route. Your vehicle's main computer will decide which of your four wheels need to be slowed down in order to bring the vehicle under control. Reconnect for 2 more seconds. I truly just need a diagram as to where the brake pressure modulator valve is located, I can handle the rest. Bleed the wheels in the following order: right rear, left rear, right front, left front.
While the pedal is depressed to its full extent, tighten the bleed screw. This mode provides a data list that includes wheel speed and solenoid states. Slowly depress the brake pedal. To begin, first make sure the brake pedal is released. If the pedal must be used, consider removing the master cylinder to clean the reservoir, then bench bleed it to flush out any debris. . Check the master cylinder fluid level every four to six strokes of the brake pedal in order to avoid running the system dry.
With motor off, pedal is about normal to a little low, with engine running pedal goes to the floor. I know it's frustrating cuz I have been there. The pump serves 2 purposes: - Transfers brake fluid from the brake calipers to the master cylinder reservoir during pressure decrease events - Transfers brake fluid from the master cylinder reservoir to the brake calipers during pressure increase events. Release the brake pedal and wait 10 - 15 seconds for the master cylinder pistons to return to the home position. As far as I know there are no leaks in the system. I have a 2005 Chevrolet express 3500 that needs to have the brake pressure modulator valve replaced according to a local Chevrolet dealer.
Best Regards I just a got a quote for my 2001 suburban with 153K miles on it for replacement of the Brake Pressure Modulator Valve error code C0268 and Electronic Brake Control Module error code C0265. A lab scope will nail this every time. Bleed the system as many times as necessary in order to obtain the appropriate feel of the pedal. This method of control is not as inefficient as it may seem, since the front wheels do as much as 80% of the work during heavy brake application. Brake Pressure Modulator Valve and Electronic Control Unit. I read another post about the possibility of the wheels locking up upon failure of the Brake Pressure modulator valve.
The manual I have access to at the moment does not have repair instructions for this in particular problem. Release the brake pedal between each test. Self-Tests Two different self-tests are performed whenever the vehicle is started. Snapshots can be very helpful when searching for intermittent problems. Attach special tools Kent-Moore No. Bleed the system at the right rear wheel first. I am respectfully requesting any advice or are there any special things I need to know for example: you must align the camshaft dot and the crankshaft dot with the number one piston up, I learned that the hard way at age 15 and had to take the top half of my small block Chevy all back apart.