Bendix Commercial Vehicle Systems SB-7 AIR DISC BRAKE - Manual (Page 13)

13
4 Safety Instructions for service work
(for “Axial- and Radial Disc Brake”)
Please refer to the relevant safety instructions for
repair work on commercial vehicles, especially for
jacking up and securing the vehicle.
Use only Genuine Bendix parts.
Please follow repair manual instructions and adhere
to the wear limits of the Pads and the Rotors - see
Section 5.3.
Use only recommended tools - see Section 2.1.
Tighten bolts and nuts to the recommended torque
values - see Section 2.4.
After re-fitting the wheel according to the Vehicle
Manufacturer’s recommendations, please ensure that
there is sufficient clearance between the Tire Valve
Stem, the Caliper and the wheel rim, to avoid dama-
ge to the Valve.
After service work:
Check the brake performance and the system beha-
vior by actual road test.
3.4 Description of operation
(Floating Caliper principle)
3.4.1. Brake Actuation
During actuation, the Push Rod of the Actuator (18/1
or 18/2) moves the Lever (19). The input forces are
transferred via the Eccentric Bearing (20) to the
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).
After overcoming the running clearance between the
Pads and Rotor, the reaction forces are transmitted to
the outboard Pad (12). The clamping forces on the
Pads (12) and the Rotor (46) generate the braking
force for the wheel.
3.4.2. Brake release
After releasing the air pressure, the two Return
Springs (27/28) push the Bridge (17) and Lever (19)
back to the start position; this ensures a running
clearance between Pads and Rotor is maintained.
3.4.3 Brake adjustment (automatic)
To ensure a constant running clearance between
Rotor and Pads, the brake is equipped with a low
wearing, automatic adjuster mechanism. The
Adjuster (23) operates with every cycle of actuation
due to the mechanical connection with Lever (19). As
the Pads and Rotor wear, the running clearance
increases. The Adjuster (23) and Turning Device (24)
turn the Threaded Tubes (16) by an amount neces-
sary to compensate for this wear. The total running
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
WARNING!
Before starting repair work, block the
wheels to ensure that the vehicle cannot
roll away, before releasing the park brake.
See Page 36 for full Safety Guidelines.
problems.