Electric Drum Brakes & Break-In

Adjustment, magnets, shoes and burnishing new brakes.

Lessons

1. 01Electric Brake AdjustmentManual starwheel adjustment and service intervals.
2. 02Magnets, Shoes & AmperageWear limits and the amperage test.
3. 03When Break-In Is RequiredNew axles, new shoes, or new magnets.
4. 04Standard Burnishing Procedure20–50 applications from 40 mph down to 20–25 mph.
5. 05Aggressive Method (Skilled Technician)Highway-speed drag for one-half mile.
6. 06Electrical Operation and Evidence-Based DiagnosisTrace electric brake actuation and use voltage and current measurements to distinguish controller, wiring, and magnet faults.
7. 07Inspection, Contamination Control, and Replacement DecisionsInspect shoes, magnets, and drum surfaces while controlling dust and identifying conditions that require replacement.
8. 08Shoe Replacement and Assembly VerificationUse component identity, adjuster type, and wiring checks to verify a balanced and correctly assembled shoe replacement.
9. 09Clearance Adjustment and Controller SynchronizationSeparate mechanical clearance adjustment from controller gain and timing adjustments, then verify coordinated braking by road test.
10. 10Break-In Methods and VerificationSelect the applicable documented burnishing method, manage its operating conditions, and verify seating without confusing break-in with routine braking.