Brake Master Cylinder: Description and Operation

Brake Master Cylinder
The brake master cylinder is a dual piston type. The brake master cylinder operates as follows:
^ When the brake pedal is depressed, pressure is applied by mechanical linkage to the primary and secondary piston.
^ Brake master cylinder pistons apply hydraulic pressure to the 2 diagonal hydraulic circuits.
^ The brake master cylinder will not be overhauled, due to internal adjustments which require extensive special tools and fixtures. Repair is made by installing a new master cylinder only.

The brake master cylinder consists of:
^ brake master cylinder fluid reservoir.
^ brake master cylinder body.
^ two pins that secure the reservoir to the master cylinder (on vehicles equipped with ABS and traction control).

Brake Master Cylinder Reservoir

NOTE: Whenever the brake master cylinder reservoir is removed from the brake master cylinder, new grommets must be installed.

The brake master cylinder reservoir:
^ is mounted to the brake master cylinder.
^ holds fluid supply for each brake master cylinder hydraulic piston.
^ provides visual maximum fluid level marking.
^ contains the brake master cylinder fluid level sensor.