Lexus RX300 (MCU15). Service manual — part 171

BR0IR–04

F13378

F13275

F13276

F13277

BR–36

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BRAKE

FRONT BRAKE CALIPER

LEXUS RX300 (RM785E)

INSPECTION

1.

MEASURE PAD LINING THICKNESS

Using a ruler, measure the pad lining thickness.

Standard thickness: 11.0 mm (0.433 in.)
Minimum thickness: 1.0 mm (0.039 in.)

Replace the pad if the pad’s thickness is at the minimum thick-
ness or less, or if the pad has severe, uneven wear.

2.

MEASURE DISC THICKNESS

Using a micrometer, measure the disc thickness.

Standard thickness: 28.0 mm (1.102 in.)
Minimum thickness: 26.0 mm (1.024 in.)

Replace the disc if the thickness of the disc is at the minimum
thickness or less. Replace the disc or grind it on a lathe if it is
scored or is worn unevenly.

3.

MEASURE DISC RUNOUT

Using a dial indicator, measure the disc runout at a position 10
mm (0.39 in.) from the outside edge.

Eurpe:
Maximum disc runout: 0.035 mm (0.0020 in.)
Except Eurpe:
Maximum disc runout: 0.05 mm (0.0020 in.)

If the disc’s runout is at the maximum value or greater, check the
bearing play in the axial direction and check the axle hub runout
(See page SA–10). 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 from the knuckle.

(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 down of the run-
out and the disc’s position on the hub.

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BRAKE

FRONT BRAKE CALIPER

BR–37

LEXUS RX300 (RM785E)

(d)

Europe:
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 0.035 mm (0.0020 in.), install the disc in that
position.

S

If the minimum runout recorded in (c) and (d) is
greater than 0.035 mm (0.0020 in.), replace the disc
and repeat step 3.

(e)

Except Europe:
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 0.05 mm (0.0020 in.), install the disc in that
position.

S

If the minimum runout recorded in (c) and (d) is
greater than 0.05 mm (0.0020 in.), replace the disc
and repeat step 3.

(f)

Install the torque plate and torque the mounting bolts.
Torque: 107 N·m (1,090 kgf·cm, 79 ft·lbf)

BR0IS–02

BR–38

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BRAKE

FRONT BRAKE CALIPER

LEXUS RX300 (RM785E)

REASSEMBLY

Reassembly is in the reverse order of disassembly (See page BR–35).
NOTICE:
Apply lithium soap base glycol grease to the parts indicated by the arrows (See page BR–32).

BR0IT–04

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BRAKE

FRONT BRAKE CALIPER

BR–39

LEXUS RX300 (RM785E)

INSTALLATION

Installation is in the reverse order of removal (See page BR–34).
HINT:

S

After installation fill the brake reservoir with brake fluid, bleed brake system (See pageBR–4).

S

Check for leaks.