Master Cylinder, Brake: Installation
NOTE:
The master cylinder must be bled before installing it on the vehicle.
- Bench bleed the master cylinder. Refer to MASTER CYLINDER, BRAKE, STANDARD PROCEDURE .
- Wipe the face of the power brake booster clean where the vacuum seal on the rear of the master cylinder comes in contact when it's installed. Do not get any cleaner or debris inside the booster.CAUTION:
When installing a master cylinder on the vehicle, a NEW vacuum seal (2) MUST be installed on the master cylinder mounting flange (1).
- If the master cylinder does not have a new vacuum seal (2) on the mounting flange (1), remove it. Install a NEW vacuum seal (2) on the master cylinder mounting flange (1) making sure the seal fits squarely in its groove.
- Position master cylinder on studs of power brake booster (8), aligning booster push rod with master cylinder piston.
- Install two NEW
master cylinder mounting nuts (5). Tighten both the mounting nuts to the proper specifications. Refer to TORQUE SPECIFICATIONS .CAUTION:
When tightening primary and secondary brake tube nuts at master cylinder, be sure brake tubes do not contact any other components within vehicle and that there is slack in flexible sections of tubes. This is required due to movement between ABS ICU and master cylinder while vehicle is in motion.
- Thread primary and secondary (3) brake tubes into master cylinder primary and secondary ports. Brake tubes must be held securely when tightened to control orientation of flex section. Tighten the tube nuts to the proper specifications. Refer to TECHNICAL SPECIFICATIONS .
- Connect wiring harness connector (4) to brake fluid level switch mounted in brake fluid reservoir.
- Connect negative battery cable to battery post.
- Fill the master cylinder reservoir to the proper level.WARNING:
Be certain a firm brake pedal is achieved prior to attempting to operate the vehicle. If a firm brake pedal cannot be achieved, bleed the brake hydraulic system and check for leaks.
- Start engine and let idle for approximately 30 seconds, then turn off and wait about 1 minute. Fully stroke brake pedal to assure there are several strokes with assist prior to depletion of vacuum. If not, check for missing seal between master cylinder and booster.
- Road test the vehicle to ensure proper operation of the brakes.