Step 3 » GENERAL learning environment Category B (B, B1)

For answer  A 

The heating of the wheel drums while driving is caused by the seizing of the wheel cylinders and pistons, which causes continuous friction between the brake shoes and drums, even when the brake is not applied. This continuous friction generates high temperatures and can lead to premature wear of the braking system.

For answer  B 

If the braking system runs out of fluid, the braking system will no longer function, because the pressure needed to operate the pads or shoes cannot be transmitted. In this case, there is no contact between drums and shoes, so their heating cannot occur.

For answer  C 

The breaking of the parking brake cable does not affect the service brake, because these are two independent braking systems. The parking brake (the handbrake) is used to keep the vehicle stationary, while the service brake is operated by the brake pedal. Thus, the failure of one of them does not influence the functioning of the other.

The correct answer is: A

Recommendations:

Mechanics course (knowledge of main elements) --> Mechanics course