Tools Required
• | J 39544-KIT Torque-Limiting
Socket Set, or equivalent |
• | J 45101 Hub and Wheel
Runout Gage |
Caution: Refer to Brake Dust Caution in the Preface section.
Important:
• | Brake rotor assembled lateral runout (LRO) exceeding the maximum allowable
specification can cause thickness variation to develop in the brake rotor over
time, usually between 4 800-11 300 km (3,000-7,000 mi). |
• | Brake rotor thickness variation MUST be checked BEFORE checking for
assembled lateral runout (LRO). Thickness variation exceeding the maximum acceptable
level can cause brake pulsation. Refer to
Brake Rotor Thickness Variation Measurement
. |
- Matchmark the position of the brake rotor to the wheel studs if this
has not been done already.
Important: Whenever the brake rotor has been separated from the hub/axle flange, any rust
or contaminants should be cleaned from the hub/axle flange and the brake rotor mating
surfaces. Failure to do this may result in excessive assembled lateral runout (LRO)
of the brake rotor, which could lead to brake pulsation.
- Inspect the mating surface of the hub/axle flange and the brake rotor to ensure
that there are no foreign particles, corrosion, rust, or debris remaining. If the
wheel hub/axle flange and/or if the brake rotor mating surfaces exhibit these conditions,
perform the following steps:
2.2. | Using the J 42450-A
,
thoroughly clean any rust or corrosion from the mating surface of the hub/axle flange. |
2.3. | Using the J 41013
,
thoroughly clean any rust or corrosion from the mating surface of the brake rotor. |
2.4. | Clean the friction surfaces of the brake rotor with denatured alcohol,
or an equivalent approved brake cleaner. |
- Install the rotor to the hub/axle flange using the matchmark made prior
to removal.
- Hold the rotor firmly in place against the
hub/axle flange and install one of the J 45101-100
(1), and one lug nut (2) onto the upper-most wheel
stud.
- Continue to hold the rotor secure and tighten the lug nut firmly by
hand.
- Install the remaining J 45101-100
and lug nuts onto the wheel studs and tighten
the nuts firmly by hand in a star-pattern.
- Using the J 39544-KIT
,
or equivalent, tighten the lug nuts in a star-pattern to specification, in order
to properly secure the rotor. Refer to
Tire and Wheel Removal and Installation
in Tires and Wheels.
- If the brake rotor has been REFINISHED or REPLACED with a new rotor,
proceed to step 14.
- If the brake rotor meets the following criteria, proceed to step 10.
• | The rotor is within specifications and is being REUSED |
• | The rotor has NOT been refinished |
• | The rotor does NOT exhibit thickness variation exceeding the maximum
allowable level |
- Mount a dial indicator, J 45101
, or equivalent, to the steering knuckle and
position the indicator button so it contacts the brake rotor friction surface at
a 90 degree angle, approximately 13 mm (0.5 in) from the outer
edge of the rotor.
- Measure and record the assembled LRO of the brake rotor.
11.1. | Rotate the rotor until the lowest reading is displayed on the indicator
dial, then set the dial to zero. |
11.2. | Rotate the rotor until the highest reading is displayed on the dial. |
11.3. | Mark the location of the high spot relative to the nearest wheel stud,
or studs. |
11.4. | Measure and record the amount of LRO. |
- Compare the brake rotor assembled LRO to the following specification:
Specification
• | Front brake rotor maximum allowable assembled lateral runout: 0.06 mm
(0.002 in) |
• | Front brake rotor (J55) maximum allowable assembled lateral runout: 0.127 mm
(0.005 in) |
• | Rear brake rotor maximum allowable assembled lateral runout: 0.06 mm
(0.002 in) |
• | Rear brake rotor (J55) maximum allowable assembled lateral runout: 0.127 mm
(0.005 in) |
- If the brake rotor assembled LRO is within specifications, proceed to
step 18.
If the brake rotor assembled LRO exceeds the specification, refinish the rotor
to ensure true parallelism, refer to
Brake Rotor Refinishing
. After refinishing the rotor, proceed to step 14.
- Mount a dial indicator, J 45101
, or equivalent, to the steering knuckle and
position the indicator button so it contacts the brake rotor friction surface at
a 90 degree angle, approximately 13 mm (0.5 in) from the outer
edge of the rotor.
- Measure and record the assembled LRO of the brake rotor.
15.1. | Rotate the rotor until the lowest reading is displayed on the indicator
dial, then set the dial to zero. |
15.2. | Rotate the rotor until the highest reading is displayed on the dial. |
15.3. | Mark the location of the high spot relative to the nearest wheel stud,
or studs. |
15.4. | Measure and record the amount of LRO. |
- Compare the brake rotor assembled LRO to the following specification:
Specification
• | Front brake rotor maximum allowable assembled lateral runout: 0.06 mm
(0.002 in) |
• | Front brake rotor (J55) maximum allowable assembled lateral runout: 0.127 mm
(0.005 in) |
• | Rear brake rotor maximum allowable assembled lateral runout: 0.06 mm
(0.002 in) |
• | Rear brake rotor (J55) maximum allowable assembled lateral runout: 0.127 mm
(0.005 in) |
- If the brake rotor assembled LRO measurement exceeds the specification,
bring the LRO to within specifications. Refer to
Brake Rotor Assembled Lateral Runout Correction
.
- If the brake rotor assembled LRO measurement is within specification,
install the brake caliper and depress the brake pedal several times to secure
the rotor in place before removing the J 45101-100
and the lug nuts.