Automobile & Light Truck Certification Test A5 BrakesDrum Brake Diagnosis and RepairMedium
A technician is replacing the brake shoes on a drum brake system. They notice that the hold-down springs are severely corroded and have lost much of their tension. What problem could this condition lead to if not corrected?
- AReduced parking brake effectiveness.
- BPremature wear of the wheel cylinder cups.
- CBrake shoes rattling or shifting within the assembly.
- DIncreased brake fluid consumption.
Show answer & explanationAnswer & explanation
Correct answer: C. Brake shoes rattling or shifting within the assembly.
Hold-down springs are designed to keep the brake shoes securely against the backing plate, preventing them from rattling or shifting. If these springs are corroded and lose tension, the shoes can vibrate or move out of position, leading to noise, uneven wear, or even complete brake failure in severe cases.
Why the other options are wrong
- A. Parking brake effectiveness is primarily affected by the parking brake cable, levers, and shoe adjustment, not hold-down springs directly.
- B. Wheel cylinder cup wear is related to hydraulic pressure and seal integrity, not hold-down springs.
- D. Increased brake fluid consumption is typically a sign of a leak in the hydraulic system, unrelated to hold-down springs.
Hold-Down Spring Function
Hold-down springs secure the brake shoes against the backing plate, preventing them from rattling, shifting, and ensuring proper alignment with the drum.
- Prevents shoe movement
- Maintains alignment
- Reduces noise
Memory trick: Hold-down springs keep the shoes in their place, preventing a noisy race.