Lexus RX300 (MCU15). Service manual — part 173

F12077

BR06U–05

F13367

BR–44

–

BRAKE

REAR BRAKE CALIPER

LEXUS RX300 (RM785E)

REMOVAL

1.

REMOVE REAR WHEEL

2.

DISCONNECT FLEXIBLE HOSE

(a)

Remove the union bolt and 2 gaskets from the caliper,
then disconnect the flexible hose from the caliper.
Torque: 29 N·m (300 kgf·cm, 21 ft·lbf)

HINT:
At the time of installation, insert the flexible hose lock securely
in the lock hole in the caliper.
(b)

Use a container to catch the brake fluid as it drains out.

3.

REMOVE CALIPER

(a)

Remove the installation bolt.
Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)

(b)

Remove the caliper from the torque plate.

4.

REMOVE 2 PADS WITH 4 ANTI–SQUEAL SHIMS

5.

REMOVE 4 PAD SUPPORT PLATES

NOTICE:
At the time of installation, there should be no oil or grease
adhering to the friction surfaces of the pads or disc.

6.

REMOVE MAIN PIN

Remove the main pin.

Torque: 26 N·m (270 kgf·cm, 20 ft·lbf)

BR06V–04

R00520

–

BRAKE

REAR BRAKE CALIPER

BR–45

LEXUS RX300 (RM785E)

DISASSEMBLY

1.

REMOVE SLIDING BUSHING AND 2 DUST BOOTS

2.

REMOVE MAIN PIN DUST BOOT

NOTICE:
Ensure that the boots are secured firmly to the bushing and
caliper grooves.
3.

REMOVE BOOT RING AND PISTON BOOT
(See step 1 on page BR–35)

4.

REMOVE PISTON (See step 2 on page BR–35)

5.

REMOVE PISTON SEAL (See step 3 on page BR–35)

BR06W–05

F13369

BR–46

–

BRAKE

REAR BRAKE CALIPER

LEXUS RX300 (RM785E)

INSPECTION

1.

MEASURE PAD LINING THICKNESS
(See step 1 on page BR–36)
Standard thickness: 10.0 mm (0.394 in.)
Minimum thickness: 1.0 mm (0.039 in.)

2.

MEASURE DISC THICKNESS
(See step 2 on page BR–36)
Standard thickness: 10.0 mm (0.394 in.)
Minimum thickness: 8.5 mm (0.354 in.)

3.

MEASURE DISC RUNOUT
(See step 3 on page BR–36)
Maximum disc runout: 0.15 mm (0.0059 in.)

If the disc’s runout is maximum value or greater, check the bear-
ing play in the axial direction and check the axle hub runout
(See page SA–45). If the bearing play and axle hub runout are
not abnormal, adjust the disc runout or grind it on a ”On–car”
brake lathe.

4.

IF NECESSARY, ADJUST DISC RUNOUT

(a)

Remove the 2 bolts and torque plate.

(b)

Remove the hub nuts and the disc. Reinstall the disc ro-
tating 1/5 of a turn from its original position on the hub.
Install and torque the hub nuts.
Torque: 103 N·m (1,050 kgf·cm, 76 ft·lbf)

(c)

Remeasure the disc runout. Make a note of the runout
and the disc’s position on the hub.

(d)

Repeat (b) and (c) until the disc has been installed on the
3 remaining hub positions.

S

If the minimum runout recorded in (c) and (d) is less
than 0.15 mm (0.0059 in.), install the disc in that
position.

S

If the minimum runout recorded in (c) and (d) is
greater than 0.15 mm (0.0059 in.), replace the disc
and repeat step 3.

(e)

Install the torque plate and torque the mounting bolts.
Torque: 47 N·m (475 kgf·cm, 34 ft·lbf)

BR06X–02

–

BRAKE

REAR BRAKE CALIPER

BR–47

LEXUS RX300 (RM785E)

REASSEMBLY

Reassembly is in the reverse order of disassembly (See page BR–45).
NOTICE:
Apply lithium soap base glycol grease to the parts indicated by the arrows (See page BR–43).