Daewoo Nubira. Service manual - part 58
4E – 2
I
REAR DISC BRAKES
DAEWOO V–121 BL4
DIAGNOSIS
LINING INSPECTION
1. Raise and suitably support the vehicle.
2. Remove the rear wheels. Refer toSection 2E, Tires
and Wheels.
3. Visually check the linings for minimum thickness
and wear.
4. Measure the thickness.
Important : The minimum thickness of the lining is 0.2 mm
(0.08 inch).
5.
Install the shoe and linings in axle sets only.
6.
Install the rear wheels. Refer toSection 2E, Tires
and Wheels.
7.
Lower the vehicle.
ROTOR INSPECTION
Brake rotors are manufactured with close tolerances for
thickness variation, flatness, and lateral runout. However,
pits and grooves are created in the rotors during usage.
The lack of uniformity of the braking surfaces of the rotor
can cause inadequate braking and a pulsating pedal dur-
ing braking. The surface finish of the rotor is also important
because an unsuitable surface finish can cause pulling
and rapid wear of the brake shoe lining.
If a rotor does not meet specifications, it should be refin-
ished to specification or replaced. Refinishing of the rotor
should only be done with precision equipment.
Thickness variation can be checked by measuring the
thickness of the rotor at four or more points around the cir-
cumference of the rotor. All measurements must be made
at the same distance from the edge of the rotor. A rotor that
varies by more than 0.10 mm (0.004 inches) can cause
pedal pulsations and/or front end vibration during braking.
Thickness can be measured with a commercially available
micrometer.
Light scoring of the rotor surfaces is acceptable if it does
not exceed 0.40 mm (0.016 inches) in depth. Scoring mea-
surements can be made with a commercially available
brake micrometer.
Lateral runout cannot exceed 0.10 mm (0.004 inches). If
lateral runout exceeds the specification, make sure there
is no dirt between the rotor and the hub and that hub–to–
rotor contact surfaces are smooth and free from burrs.
Use a commercially available dial indicator to check the
lateral runout according to the following procedure:
1. Position the transaxle in NEUTRAL and raise the
vehicle.
2. To preserve wheel balance, mark the relative posi-
tions of the wheel and the hub, and remove the
front wheel.
3. Fasten the brake rotor to the wheel hub with two
wheel bolts.
4. Fasten a dial indicator to the brake caliper.
5. Place the gauge tip approximately 234 mm (9.2
inches) from the center of the rotor hole, perpendic-
ular to the disc and under slight preload. Observe
the gauge while rotating the rotor.
6. After the measuring is completed, remove the dial
indicator and wheel bolts.
7. If necessary, refinish the rotor with precision equip-
ment. Measure the runout again after refinishing. If
the runout exceeds 0.10 mm (0.004 inches) after
refinishing, the rotor should be replaced.
8. Align the marks that weremade before the wheel
was removed and install the front wheel.
9. Lower the vehicle.