ABS System Operation

BASE BRAKE SYSTEM
The brake systems use conventional braking under normal operating conditions. The following components are necessary for operation of conventional braking:
- The brake pedal force
- The vacuum booster
- The compact master cylinder

ABS MODULATOR FLUID FLOW
Each front channel consists of the following components:
- A motor
- A solenoid
- An Expansion Spring Brake (ESB)
- A ball screw
- A piston
- A check valve

The following conditions exist under normal operating conditions (base brakes):
- The piston remains in the highest (home) position.
- The solenoid remains open (not energized).

The following actions permit the above conditions to exist:
- The motor turns the ball screw upward, which then drives the nut upward.
- The Expansion Spring Brake (ESB) holds the piston at the upmost position.