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4D – 2 FRONT DISC BRAKES
DISC BRAKE CALIPER ASSEMBLY
This caliper has a single bore and is mounted to the
steering knuckle with two mounting bolts. Hydraulic
pressure, created by applying the brake pedal, is con-
verted by the caliper to a stopping force. This force acts
equally against the piston and the bottom of the caliper
bore to move the piston outward and to slide the caliper
inward, resulting in a clamping action on the rotor. This
clamping action forces the linings against the rotor,
creating friction to stop the vehicle.
Important:
D Replace all components included in the repair kits
used to service this caliper.
D Lubricate the rubber parts with clean brake fluid to
ease assembly.
D Do not use lubricated shop air on brake parts, as
damage to the rubber components may result.
D If any hydraulic component is removed or discon-
nected, it may be necessary to bleed all or part of the
brake system.
D Replace the pads in axle sets only.
D The torque values specified are for dry, unlubricated
fasteners.
D Perform the service operations on a clean bench, free
from all mineral oil materials.
DESCRIPTION AND OPERATION
D17B001A
CLEARANCE CALIBRATION
When the hydraulic pressure is applied to the piston, the
piston moves leftward. The piston seal, which extent
considerable pressure against the piston, moves with
cylinder.
However, as a part of the piston seal is fixed into a grove
in the cylinder shape of the seal is as shown in below
figure, distorted toward the piston moving direction.
When the pressure is taken off from the brake pedal and
the hydraulic pressure is released from the piston, a re-
storing elastic force is generated at the seal and pushes
the piston rightward and back it in original position.
As the pads wear away and the clearance between rotor
and pads becomes larger, the piston moves larger.
The seal then could change in shape further, but since
end of the seal is fixed into the groove in the cylinder, the
distortion is limited to the same amount as previously
described.
The piston moves further to cover the distance of clear-
ance. As the piston returns by the same distance and
the rubber seal recovers its original shape, the clear-
ance between the rotor and pads is maintained in origi-
nal condition.
1. Piston
2. Piston Seal
3. Pads
a. Clearance
D107B002
DAEWOO M-150 BL2
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