Brake Master Cylinder - Operation

OPERATION

NOTE: The Electronic Stability Control (ESC) may also be referred to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain components may also reference ESP, ESC, or use the traction control symbol.

When the brake pedal is pressed, the master cylinder primary and secondary pistons apply brake pressure through the ABS Integrated Control Unit (ICU) and chassis brake tubes to each brake assembly. The brake fluid reservoir supplies the brake hydraulic system with the necessary fluid to operate properly.

ABS (ESC) equipped master cylinder outlet ports supply hydraulic pressure to the ABS 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.