Valor 18385, Owner'S Manual

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Brake Drum Inspection
Clean and inspect the brake drums whenever relining the brakes. To be suitable for further
service, the brake drum should pass the following checks:
1. The brake surface should be free of scoring, excessive heat checks and free of cracks.
2. The brake surface diameter should be within the maximum diameter stamped on the drum.
3. The mounting holes and pilot must be round and true.
4. The mounting surface must be clean and flat.
BRAKE SYSTEM SAFETY!
If any of the above conditions are not met, the brake drum should be replaced. Failure
to replace the brake drum will result in an unreliable braking system and may lead to an
accident.
It may be desirable to machine the braking surface to remove small heat checks or other
surface defects resulting from normal use. The following should be noted when turning the brake
drum:
1. The maximum diameter cast into the back-plate portion of the brake drum is the discard
diameter. If any portion of the brake drum exceeds the maximum diameter it must be
replaced.
2. When preparing to machine a drum, allow at least .040" under the maximum diameter for
further normal in-service wear. Failure to allow for service wear will result in a weakened
brake drum and may result in an accident.
Brake drums should be replaced in pairs to achieve the same braking power on both wheels
and maintain even braking load on the axle. Failure to replace both brake drums on an axle will result
in uneven braking load on the axle and may significantly reduce the performance, service life and/or
safety of your vehicle.
See the brake drum troubleshooting charts on the following pages for more information.