Operation

OPERATION

When the brake pedal is pressed, the master cylinder primary and secondary pistons apply brake pressure through the proportioning valves (on non-ABS vehicles) and chassis brake tubes to each brake assembly. The brake fluid reservoir supplies the brake hydraulic system with the necessary fluid to operate properly.

The non-ABS master cylinder's primary outlet ports supply hydraulic pressure to the right front and left rear brakes while the secondary outlet ports supply hydraulic pressure to the left front and right rear brakes. ABS equipped master cylinder outlet ports supply hydraulic pressure to the ABS Integrated Control Unit (ICU) where it is distributed to the individual wheel brakes.

The master cylinder reservoir cap diaphragm is slit to allow atmospheric pressure to equalize on both sides of the diaphragm.