Servicing

Minor scores should be removed with sandpaper. Grooves and large scores can only be removed by machining with special equipment, as long as the braking surface is within specifications stamped on brake drum outer surface. Any brake drum sufficiently out of round to cause vehicle vibration or noise while braking, or showing taper should also be machined, removing only enough stock to true up the brake drum.

After a brake drum is machined, wipe braking surface diameter with a cloth soaked in denatured alcohol. If one brake drum is machined, the other should also be machined to the same diameter to maintain equal braking forces.