Rockwell Disc Parking Brake; Park Brake Caliper; Removal - Komatsu 830E Shop Manual

A park brake assembly is mounted to each wheel
motor on each outboard disc and is intended for
parking only. The park brake caliper is a dual piston,
spring applied, hydraulically released type brake
designed for petroleum base fluid.
NOTE: Some trucks may be equipped with TWO (2)
Park Brake Calipers per wheel. Service and
adjustment for these calipers are the same as
presented here.
The parking brake housing contains two spring
loaded, lining faced, pistons. The spring preload is
controlled by an adjustment bolt. A yoke, which fits
over the housing, contains the adjustment bolt and is
secured to the housing with a clamping bolt.
The springs are held in place by spring retainers. The
spring retainers are grooved to receive the inside
diameter of the piston dust boot, and the housing is
grooved to receive the outside diameter of the piston
dust boot.
FIGURE 7-1. PARK BRAKE ASSEMBLY (SCL-70)
1. Parking Brake Caliper
2. Capscrew
3. Mounting Bracket
J07013

ROCKWELL DISC PARKING BRAKE

4. Jam Nut
5. Adjustment Bolt
6. Clamping Capscrew
Rockwell Parking Brake

PARK BRAKE CALIPER

Removal

The park brake caliper may be removed from wheel
without disassembling other brake components.
1. Securely block truck to prevent movement.
Do not loosen or disconnect any hydraulic brake
line or component until engine is stopped, key
switch is "Off" and drain valves on brake accu-
mulators are opened and steering accumulators
are bled down.
Hydraulic fluid escaping under pressure can
have sufficient force to enter a person's body by
penetrating the skin and cause serious injury and
possibly death if proper medical treatment by a
physician familiar with this injury is not received
immediately.
2. Disconnect brake line connected to caliper.
3. Loosen jam nut (4, Figure 7-1) on adjustment
bolt (5). Loosen clamping capscrew (6) one turn
and back out adjustment bolt (5) six turns to
release park brake linings from outer disc.
4. Support park brake caliper and remove cap-
screws (2) securing caliper to mounting bracket
(3).
5. Remove caliper from disc and set aside for
repairs or replacement.
J7-1