Docstoc

Air disc brakes

Document Sample
Air disc brakes Powered By Docstoc
					Thomas Built Buses

C2 Air disc brakes




Portland, Feb.14th 2008
Presenter Name

Center for Education
                          Security Classification1Line
Air Disc Brakes

                       •Available   on C2 Front and Rear


                       •Bendix   model ADB22X
                               automatic brake
                       •Internal
                       adjustment allows the brakes to
                       always be in a state of optimum
                       adjustment.
                                stable stops due to
                       •Straight,
                       minimized brake force variation
                       between brakes.
                       •Reduced     part number complexity




Center for Education                         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   number of part numbers equal less
                       parts to stock
                       •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 rear
                       •Availablein a complete loaded caliper for LH
                       or RH for quicker replacements
                       •Replace   brake pads without removing the
                       caliper.




Center for Education                                    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 inspection.
•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 or cage the brakes and support the
vehicle with proper jack stands and chock all
wheels that remain on the ground
•Prior    to pad removal
•Pullof the adjuster cap (37) using the tab,
taking care to keep the shear adapter (61) in
position on the adjuster (23)
•Using  a box-end wrench or socket, fully wind
back the tappet and boot assemblies by
rotating the shear adapter in a counter-
clockwise direction




•Note     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   the clip (26) and washer (45),
                       depress the pad retainer (11) and remove the
                       pad retainer pin (44)
                       •Discard these four items – replacements are
                       included in the service kit (BW 802078)
                       •To remove the outer brake pad, slide the
                       caliper fully to the outboard position first.
                       •To remove the inner pad slide the caliper to
                       the inboard side.


                       •While you have the pads removed perform a
                       brake rotor inspection




Center for Education                                    Thomas Built Buses   8
Air Disc Brakes – Rotor Inspection

•Measure  the 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
Air Disc Brakes – Rotor Inspection




Center for Education                 Thomas Built Buses   10
Air Disc Brakes




Center for Education   Thomas Built Buses   11
Air Disc Brakes




                       Front   Rear


Center for Education                  Thomas Built Buses   12
Air Disc Brakes




 Service Manual
 BW7308
 SD-23-7541




Center for Education   Thomas Built Buses   13
Air Disc Brakes




 Parts Manual
 BW1114
 ADB-0408




Center for Education   Thomas Built Buses   14
Air Disc Brakes – special tools available




Center for Education                        Thomas Built Buses   15
Air Disc Brakes




                       • Questions?




Center for Education                  Thomas Built Buses   16

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:11
posted:10/16/2012
language:Unknown
pages:16