A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. The brake pedal is firm when applied. While starting the engine with the brakes applied, the pedal does not go down slightly. Technician A says excessive brake pedal freeplay could be the cause. Technician B says air trapped in the hydraulic system could be the cause. Who is right?

ASE identifies brakes as an individual service area. The brakes service area involves these components: Hydraulic system: Components (such as the brake lines and master cylinder) that transfers power from the brake pedals to either disc or drum brakes. Mechanical Foundation System: Components (such as discs and pads or drums and shoes) that creates the friction required to stop the vehicle. Electronic system: Components that notify the driver of a failure in the brake system. In anti-lock brake (ABS) systems, electrical system components work to prevent tire skidding.