Master Cylinder

DESCRIPTION






A vehicle equipped with ABS uses a different master cylinder than a vehicle that is not equipped with ABS. Vehicles equipped with ABS use a center port master cylinder while vehicles not equipped with ABS use a compensating port master cylinder.
The brake tubes from the primary and secondary outlet ports on the master cylinder go directly to the Hydraulic Control Unit (HCU).
The power brake booster used on a vehicle equipped with ABS is the same as a vehicle not equipped with ABS.
Refer to Hydraulic Systems, Master Cylinder for further information and procedures on master cylinders.
When the brake pedal in depressed, the master cylinder primary and secondary pistons apply brake pressure through the chassis brake tubes, ABS hydraulic control unit, and proportioning valves to each brake assembly. On ABS master cylinders, the primary outlet port supplies hydraulic pressure to the right front and left rear brakes. The secondary outlet port supplies hydraulic pressure to the left front and right rear brakes.
Refer to the Brakes, Description and Operation for further information.

OPERATION
When the brake pedal in depressed, the master cylinder primary and secondary pistons apply brake pressure through the chassis brake tubes, ABS hydraulic control unit, and proportioning valves to each brake assembly. On ABS master cylinders, the primary outlet port supplies hydraulic pressure to the right front and left rear brakes. The secondary outlet port supplies hydraulic pressure to the left front and right rear brakes.
Refer to Brakes and Traction Control, Brakes, Description and Operation for further information.