Repair Procedure Overview

The brake bleed procedure consists of 5 main sections:

^ Section 1: Zero Down Accumulator Pressure (Zero Down)

This procedure is used to release the pressure from the accumulator prior to bleeding the brakes (or replacing the brake actuator). Techstream is used for this procedure.

^ Section 2: Disable Electronic Controlled Brakes (ECB Invalid)

This procedure using Techstream disables the ECB system temporarily to allow the front brakes to be bled manually. Using Techstream to disable brake control causes the master cylinder cut solenoid to turn OFF and the line from the master cylinder to front brake calipers to open allowing manual bleeding of the front brakes.

^ Section 3: Front Brake Bleed - Manual Process

This is a two-man process in which one technician pumps and holds the brake pedal while another technician opens the right front bleeder screw to remove air from the system. The same procedure is repeated for the left front.

^ Section 4: Rear Brake Bleed

^ Right Rear Brake Line Air Bleed

During this procedure Techstream opens the solenoid for the right rear brake line and then the accumulator pump runs during this process to push fluid and air out of the right rear caliper bleeder valve. During this process the brake pedal is NOT applied - the accumulator pump will automatically pump fluid out of the right rear caliper bleeder valve. This process bleeds the red brake line (suction line from the accumulator to the actuator) and passes air out through the right rear caliper bleeder.

^ Left Rear Brake Line Air Bleed

The left rear brake line is bled using a combination of the brake pedal being pressed-and-held and the accumulator pump.

^ Section 5: Reset Memory and Linear Valve Offset Calibration

The purpose of this step is to erase all previously memorized brake actuator linear valve calibration values and to re-calibrate the brake actuator linear valves after all brake bleeding procedures are finished. This procedure resets the memory of the skid control computer and then performs the Linear Valve Offset Learning Process. During the Linear Valve Offset Learning Process the skid control computer memorizes the characteristics of the actuator linear solenoids.