Final answer:
When performing a pre-trip inspection on your brakes and suspension system, it is important to ensure that the brake shoes are free of oil, grease, and brake fluid. A missing leaf spring and a cracked spring hanger can both compromise the safety of the vehicle. Brake shoes should not be coated in oil.
Step-by-step explanation:
When performing a pre-trip inspection on your brakes and suspension system, it is important to ensure that the brake shoes are free of oil, grease, and brake fluid as stated in option a. This is because oil, grease, and brake fluid can negatively affect the performance of the brakes and compromise their ability to stop the vehicle effectively. Option b is not true; a missing leaf spring can affect the suspension system and compromise the stability of the vehicle.
Similarly, option c is not true; a cracked spring hanger can also affect the suspension system and compromise the safety of the vehicle. Lastly, option d is incorrect; brake shoes should not be coated in oil as this would interfere with their friction against the brake drums or rotors.
Statement b) is not correct because even one missing leaf spring can significantly affect the suspension system and potentially cause dangerous driving conditions. Similarly, statement c) is incorrect because a cracked spring hanger can also lead to unsafe driving conditions. Statement d) suggests a dangerous situation because brake shoes should never be coated in oil as it would impair the brakes' ability to function properly.
Therefore the correct option is a)Brake shoes should be free of oil, grease, and brake fluid.