4D – 2 FRONT DISC BRAKES
DAEWOO M-150 BL2
DESCRIPTION AND OPERATION
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.
D17B001A
Important:
Replace all components included in the repair kits
used to service this caliper.
Lubricate the rubber parts with clean brake fluid to
ease assembly.
Do not use lubricated shop air on brake parts, as
damage to the rubber components may result.
If any hydraulic component is removed or discon-
nected, it may be necessary to bleed all or part of the
brake system.
Replace the pads in axle sets only.
The torque values specified are for dry, unlubricated
fasteners.
Perform the service operations on a clean bench, free
from all mineral oil materials.
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
FRONT DISC BRAKES 4D–3
DAEWOO M-150 BL2
COMPONENT LOCATOR
FRONT DISC BRAKES
D17B401A
1. Front Brake Caliper Assembly
2. Front Brake Boot Assemblies
3. Pins
4. Pin Boots
5. Front Brake Pads
6. Carrier
7. Pad Spring8. Piston Boot
9. Piston
10. Piston Seal
11. Cylinder
12. Bleeder Screw Cap
13. Bleeder Screw
4D –6 FRONT DISC BRAKES
DAEWOO M-150 BL2
REPAIR INSTRUCTIONS
ON–VEHICLE SERVICE
D107B501
SHOE AND LINING
Removal Procedure
1. Remove the front wheels. Refer to Section 2E, Tires
and Wheels.
2. Remove the brake pads.
Remove the pin bolt (1).
D107B502
Lift up the cylinder assembly (2).
D17B503A
Installation Procedure
1. Install the brake pads and the cylinder assembly with
the pin bolt.
Tighten
Tighten the pin bolt to 26 Nm (19 lb-ft).
2. Install the front wheels. Refer to Section 2E, Tires
and Wheels.
4D –10 FRONT DISC BRAKES
DAEWOO M-150 BL2
D17B708B
D17B707A
26
Assembly Procedure
Important: Clean all parts in denatured alcohol. Dry the
parts with unlubricated compressed air.
Important: Lubricate the piston with brake fluid.
1. Assembly the cylinder assembly.
Install the piston seal.
Push the piston inward until it is properly seated.
Install the piston boot.
Install the bleeder plug.
Tighten
Tighten the bleeder plug to 6 Nm (53 lb-in).
Install the bleeder plug cap.
2. Assemble the carrier.
Install the guide pin and boot.
Install the spring.
Install the pads.
3. Install the pin bolt connecting the cylinder assembly
and carrier.
Tighten
Tighten the pin bolt to 26 Nm (19 lb-ft).
4. Install the caliper assembly. Refer to “Caliper Assem-
bly” in this section.
