Practice question

What is the purpose of slack adjusters (reguladores de freno / matracas) on heavy vehicle S-cam drum brakes?

To loosen the wheel lug nuts
To adjust the mechanical clearance between the brake shoes and brake drum as the friction lining wears down, maintaining proper pushrod travel and braking efficiency
To adjust driver seat height
To change radio frequencies

Answer: B — To adjust the mechanical clearance between the brake shoes and brake drum as the friction lining wears down, maintaining proper pushrod travel and braking efficiency

The correct answer is shown above. Try the full quiz for additional practice.