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Brake Burnishing
This is critical to ensure proper brake function after brake reline or other major brake maintenance is performed
APTA Recommended Procedure:
- 10 snubs
- From 20 to 5 MPH
- At approximately 32% decel or every 500' without stopping
- After the 10th snub, make 1 complete stop from 20 MPH
Better Methods:
- 20/20/20 - 20 stops from 20 MPH at 20 PSI, or 40 MPH to 20 MPH ten times
- The purpose is to gradually raise the brake temperatures, to properly seat all brake components, mate the lining to the brake drum to improve contact and to cure the material
- Measure brake drum temperature to ensure proper brake function
- Side to side on same axle should generally be within 25°F
- Steer to rear axle should be within approximately 50°F. This may vary more due to brake valve specifications, suspension component compatibility and retarder function