Front Disc Brake Rotor Check; Brake Disc Thickness Check - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

35A-12

FRONT DISC BRAKE ROTOR CHECK

CAUTION
When servicing disc brakes, it is necessary to exercise caution to keep the disc brakes within
the allowable service values in order to maintain normal brake operation.
Before re-finishing or re-processing the brake disc surface, the following conditions should be checked.
Inspection items
Scratches, rust, saturated lining materials
and wear
Run-out or drift
Change in thickness (parallelism)
Inset or warping (flatness)
BASIC BRAKE SYSTEMS –
Remarks
If the vehicle is not driven for a certain period, the sections of
the discs that are not in contact with lining will become rusty, causing
noise and shuddering.
If grooves resulting from excessive disc wear and scratches are
not removed prior to installing a new pad assembly, there will
momentarily be inappropriate contact between the disc and the
lining (pad).
Excessive run-out or drift of the discs will increase the pedal depression
resistance due to piston knock-back.
If the thickness of the disc changes, this will cause pedal pulsation,
shuddering and surging.
Overheating and improper handling while servicing will cause inset or
warping.

BRAKE DISC THICKNESS CHECK

1. Using a micrometer, measure disc thickness at eight
2. If the disc is beyond the limits for thickness, remove it
On-vehicle Service
positions, approximately 45_ apart and 10 mm in from
the outer edge of the disc.
Brake disc thickness
Standard value: 24.0 mm
Limit: 22.4 mm
Thickness variation (at least 8 positions)
The difference between any thickness measurements
should not be more than 0.015 mm.
and install a new one. If thickness variation exceeds the
specification, replace the brake disc or turn rotor with on
the car type brake lathe ("MAD, DL-8700PF" or equivalent).
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