Page 13 - Bendix Air disc brake-01

3.4 Description of operation 4 Safety Instructions for service work
(Floating Caliper principle) (for “Axial- and Radial Disc Brake”)

3.4.1. Brake Actuation Please refer to the relevant safety instructions for
repair work on commercial vehicles, especially for
During actuation, the Push Rod of the Actuator (18/1 jacking up and securing the vehicle.
or 18/2) moves the Lever (19). The input forces are
transferred via the Eccentric Bearing (20) to the Use only Genuine Bendix parts.
Bridge (17). The force is then distributed by the
Bridge (17) and the two Threaded Tubes (16) to the
Tappets (13) and finally to the inboard Pad (12). WARNING!

After overcoming the running clearance between the Before starting repair work, block the
Pads and Rotor, the reaction forces are transmitted to wheels to ensure that the vehicle cannot
the outboard Pad (12). The clamping forces on the roll away, before releasing the park brake.
Pads (12) and the Rotor (46) generate the braking See Page 36 for full Safety Guidelines.
force for the wheel.
3.4.2. Brake release Please follow repair manual instructions and adhere
to the wear limits of the Pads and the Rotors - see
After releasing the air pressure, the two Return Section 5.3.
Springs (27/28) push the Bridge (17) and Lever (19)
back to the start position; this ensures a running Use only recommended tools - see Section 2.1.
clearance between Pads and Rotor is maintained.
Tighten bolts and nuts to the recommended torque
3.4.3 Brake adjustment (automatic) values - see Section 2.4.

To ensure a constant running clearance between After re-fitting the wheel according to the Vehicle
Rotor and Pads, the brake is equipped with a low Manufacturer’s recommendations, please ensure that
wearing, automatic adjuster mechanism. The there is sufficient clearance between the Tire Valve
Adjuster (23) operates with every cycle of actuation Stem, the Caliper and the wheel rim, to avoid dama-
due to the mechanical connection with Lever (19). As ge to the Valve.
the Pads and Rotor wear, the running clearance
increases. The Adjuster (23) and Turning Device (24) After service work:
turn the Threaded Tubes (16) by an amount neces- Check the brake performance and the system beha-
sary to compensate for this wear. The total running vior by actual road test.
clearance (sum of clearance both sides of Rotor)
should be between 0.03 and 0.04 in. (0.6 and
0.9 mm.; smaller clearances may lead to overheating
problems.

13
SD-23-7550: 000: US: Released: Wed Apr 09 01:32:27 CEST 2014: