Subaru XT 1988 Service Manual page 978

BRAKES
4-4
INSPECTION
1)
Inspection of pad
Check the pad thickness through the inspection hole and
replace pads if not with in specification.
Thickness of pad (including back metal):
Standard value
15.0
mm
(0.591
in)
Service limit
Except
XT6: 6.5
mm
(0.256
in)
XT6: 8.0
mm
(0.315
in)
Replace the pads of the right and left wheels at the same time.
Also, replace the pad spring if deformed or strained.
2) Inspection of rotor
Check the rotor for wear and damage, and repair or replace if
defective.
Thickness of rotor:
Standard value
10.0
mm
(0.394
in)
Service limit
8.5
mm
(0.335
in)
INSTALLATION
1) Clean the cal iper body and piston end face, and push the
piston in the caliper body.
When the piston is difficult to put in place, loosen the air
bleeder, then push into place.
3) Turn the caliper body back to the original position, and
tighten the lower bolt.
Tightening torque:
22 - 31 N'm (2.2 - 3.2 kg·m, 18 - 23 ft·lb)
4)
Depress the brake pedal several times with usual braking
effort to adjust the relative position between the pad and
rotor. Also, make sure that the pedal has a proper stroke.
5) Put back tires and rotate them several times. Then, wind a
rope around the circumference of tire, and confirm that tire
can be rotated with a force of less than 39 N (4 kg, 9 Ib) at the
outside diameter of tire.
If wheel bearing is worn or disc rotor is not exactly perpen·
dicular to the counterpart, the surface of disc rotor runs out in
the axial direction during rotation. This causes disc rotor to be
pressed against lining, and rotational resistance increases.
When such trouble occurs, remove tire and measure the disc
rotor runout. If the runout exceeds the limit, check the
bearing and replace it if defective. If this does not correct the
runout, replace rotor.
Disc rotor runout:
Limit
0.10
mm
(0.0039
in)
Measure the disc rotor run out at a point less than 5 mm
(0.20 in) from the outer periphery of the rotor.
Caliper Assembly
REMOVAL
2) Install the pad spring taking care of its upper and lower
sides. Then install the pad. 1) Disconnect the brake hose from the caliper body.
Fig.
77
Fig.
78
31