Kenworth T410, Driver'S Handbook Manual

Page: 179 / 418

CAT: 8612 November 2019 Page 153
OPERATING INSTRUCTIONS
DISC BRAKES
The air disc brakes are high performance, low weight, high efficiency brakes
designed for trucks and other commercial vehicles requiring between
10,000 and 23,000Nm of braking torque at each wheel.
Clamping force is produced by a globular cast iron caliper located above
the rotor and housing two lining pads. The pads are pushed against the
rotor by a dual piston actuating block connected to an eccentric shaft, which
is in turn driven by a lever operated by a standard air actuator (rotation
chamber).
The caliper is carried on a saddle which is a fixed support bolted to the
axle flange.
An equalised clamping action both on the inner and outer pads is generated
by allowing the caliper to float on the two slide pins fixed to the saddle. The
clamping force generated by the primary actuation is applied to the inner
pad which forces it into contact with the rotor. A reactive force through
the caliper body applies equal clamping force to the outer pad applying a
balanced clamping force to the rotor.
The slide pins also allow the caliper to freely position itself on the saddle
to compensate for the reduction in lining pad thickness due to wear. An
automatic self-adjuster mechanism is incorporated in order to maintain
constant clearance between pads and rotor.
The automatic adjuster operates on each clamping action to sense
excessive pad-rotor clearance, and reduces excessive clearance by a
fixed proportion with each actuation.
For brake adjustment and new lining installation, the brake incorporates
provision for manual adjustment, easily performed by using a standard
hexagonal wrench.
Brake actuation can be either clockwise or counterclockwise, depending
on how the rotation chamber has been installed on the brake unit.