Brake Pedal Assembly

Brake Pedal Assembly - Hybrid

Hybrid vehicles are equipped with a brake pedal assembly that utilizes driver input and electronic components to apply the brakes. The brake booster push rod has an elongated slot that attaches to the brake pedal with a clevis pin. The elongated slot allows for a small amount of pedal travel (freeplay) to occur without the brake pedal applying pressure on the booster push rod. This freeplay allows regenerative braking to occur. To compensate for the freeplay, the pedal assembly is equipped with a hydraulic brake pedal feel simulator that provides the same feel and resistance as a conventional brake pedal. On light or normal brake applications, sensors attached to the brake pedal assembly measure brake pedal angle and the amount of pressure applied to the brake pedal. The sensors send signals to the ABS module which activates a solenoid inside the brake booster. The solenoid draws the booster push rod into the booster, applying pressure to the master cylinder piston which then applies hydraulic pressure to the brake system. On hard brake applications, the brake pedal will travel to the end of the elongated slot, eliminating the freeplay and physically engaging the booster push rod, operating the brakes similar to a conventional brake actuation system.

The brake pedal angle sensor is available as a serviceable part separate from the hybrid brake pedal and bracket assembly.