Practice question

What is the 'slack adjuster' in an S-cam drum brake system and what is its critical safety role?

  1. A device to adjust radio volume automatically with engine speed
  2. A mechanical link between the brake chamber pushrod and the S-cam shaft that adjusts for brake lining wear to maintain proper pushrod stroke
  3. A spring that cushions driver seat vibrations
  4. A valve that regulates windscreen washer spray pressure

Answer: B — A mechanical link between the brake chamber pushrod and the S-cam shaft that adjusts for brake lining wear to maintain proper pushrod stroke

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