Oct 26

HOLDEN COMMODORE VT–VZ FRONT HUB BEARINGS

METHOD OF INSPECTION:

1. After removing wheel, temporarily reinstall three, reversed wheel nuts with a flat washer under each to prevent damage to the nut thread.

2. Mount a dial indicator to a suitable magnetic stand and attach to the front strut tube. Position the dial indicator pointer at the outer diameter of the disc, as shown in drawing.

3. Apply an outward, 10kg (22lb) force to the outer brake disc diameter, in an opposite direction to the dial indicator. To maintain consistency a spring balance capable of measuring this force, must be used. With this force applied zero the dial indicator.

4. Apply an inward, 10kg (22lb) force to the outer brake disc diameter and note the dial indicator reading.

5. The reading obtained is the angular movement, (not end float); to determine the bearing’s serviceability, compare the measured result with the following specifications.

 

WHEEL BEARING ANGULAR FLOAT SPECIFICATION NEW BEARING
0.106mm (0.0042”)

MAXIMUM USED BEARING 0.213 mm (0.0085”) MAXIMUM
6. Should the inspection show that the wheel bearing assembly is outside the specified angular float dimension then the hub must be replaced.

WORN HUBS, CAUSE ROTOR RUN OUT, RESULTING IN DTV

Special care should be taken when machining these discs. Minimum run out should be achieved. After machining discs, index the rotors to the hub, to achieve minimum run out.

MAXIMUM LATERAL RUN OUT (front discs) .040mm
When tightening wheel nuts the torque specification is 100 – 125 Nm

Avoid over tightening with rattle guns.

 

Technical Support
Disc Brakes Australia