General Operation

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The driver applies the pedal and thereby builds pressure in the primary chamber of the MC with the primary piston. The fluid from the primary chamber is transmitted from the MC via brake tube to the EHCU through the orifice and check valve and into the simulator chamber. With the SCB system active and working normally, the fluid from the primary MC chamber does not get applied to the wheel brakes but to the simulator. The pedal simulator spring, the orifice, and the check valve combine to affect a force/travel characteristic that feels smooth, normal, and controllable to the driver. A pressure transducer on the primary MC chamber/pedal simulator (MC Pressure), a pedal travel sensor on the input piston assembly, and the brake switch are inputs into the electronic control unit (EBCM). These inputs are used to determine the driver's braking intent which is used to control the torque applied to the wheels.