Thomas Built Buses C 2 Air disc brakes

Thomas Built Buses C 2 Air disc brakes Portland, Feb. 14 th 2008 Presenter Name Center for Education Security Classification 1 Line

Air Disc Brakes • Available • Bendix on C 2 Front and Rear model ADB 22 X • Internal automatic brake adjustment allows the brakes to always be in a state of optimum adjustment. • Straight, stable stops due to minimized brake force variation between brakes. • Reduced Center for Education part number complexity Thomas Built Buses 2

Air Disc Brakes • FMVSS 121 is the minimum standard for the stopping distance of a commercial vehicle. Center for Education Thomas Built Buses 3

Air Disc Brakes • Reduced • Same components equals easier to work on • Same rotors all the way around • Same pads front and rear • Same caliper kits left and right for the front and re • Available • Replace Center for Education number of part numbers equal less parts in a complete loaded caliper for LH or R brake pads without removing the caliper. Thomas Built Buses 4

Air Disc Brakes – Wear Indicator • Visual Inspection of wear indicator • Visually inspect every 3 months • Inspect the notch in the caliper and carrier if they line up it is time to remove the wheel for further • Notches that line up do not constitute “out of service” criteria Center for Education Thomas Built Buses 5

Air Disc Brakes – Pad Replacement • Easy replacement brake pads • No need to remove caliper or rotor • Recommended to replace in axle sets Center for Education Thomas Built Buses 6

Air Disc Brakes – Pad Replacement • Release • Prior • Pull or cage the brakes and support the vehicle with proper jack stands and chock all wheels to pad removal of the adjuster cap (37) using the tab, taking care to keep the shear adapter (61) in position o • Using • Note a box-end wrench or socket, fully wind back the tappet and boot assemblies by rotating the do not use an open-ended wrench as this may damage the adapter Center for Education Thomas Built Buses 7

Air Disc Brakes – Pad Replacement • Remove • Discard these four items – replacements are inclu • To remove the outer brake pad, slide the caliper fu • To remove the inner pad slide the caliper to the in • While Center for Education the clip (26) and washer (45), depress th you have the pads removed perform a brak Thomas Built Buses 8

Air Disc Brakes – Rotor Inspection • Measure thickness of the rotor at the thinnest point • Replace the rotor when the minimum thickness of 1. 46 inches or 37 mm. • Turning the rotors is not normally necessary. In the case of severe grooving of the entire friction surface, however, turning could be useful, and may increase the load bearing surface of the pads. • The minimum thickness after turning must be greater than 1. 53 inches or 39 mm. Center for Education Thomas Built Buses 9