Recommended Practice

Transit Bus Air Disc Brake Wheels-Off Inspection and Reline


This Recommended Practice provides guidelines for performing complete brake maintenance on a bus with disc brakes. It includes disassembly, cleaning, inspection and assembly. This document is to be used in conjunction with the manufacturer’s service manual. It is recommended that all components be replaced
equally on both wheel ends of the axle. Failure to do so may affect braking performance.

Document History
Document Number Version Publication Date Publication Related Information
APTA BTS-BC-RP-007-17 01/26/2017 Published Current


ABS tone ring, boot, bridge, bushing, caliper, carrier, disc, disc brake maintenance, hub, pads, pin, potentiometers, retaining strap, rotor, seal, slide pins, spring clips, torque plate, wear indicator, wear sensors, wheel seals


This document establishes a recommended practice for transit bus front/rear axle disc brake inspection and reline. Individual operating agencies should modify these guidelines to accommodate their specific equipment and mode of operation. The recommended practices and guidelines in this document
assume that the end users have sufficient skills and knowledge to repair and maintain the related systems at a journeyman level. This must include a fluent understanding of safe shop working practices, not only for the agency but also OSHA/CCOHS/provincial/federal/state and local safety standards. A familiarity with applicable industries, component/system suppliers and vehicle manufacturers is also assumed.

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