9.38
BRAKES
9924096 - 2013 RANGER RZR XP 900 / RZR XP 4 900 Service Manual
© Copyright 2012 Polaris Sales Inc.
REAR BRAKE DISC
Disc Inspection
1. Visually inspect disc for scoring, scratches, or
gouges. Replace disc if deep scratches are evident.
2. Use a 0-1” micrometer and measure disc thickness at
eight different points around the pad contact surface.
Replace disc if worn beyond service limit.
3. Mount a dial indicator and measure disc runout.
Slowly rotate the disc and read total runout on the dial
indicator. Replace the disc if runout exceeds
specifications.
Disc Replacement
1. Remove rear brake caliper (see “REAR CALIPER
SERVICE”).
2. Remove wheel hub cotter pin, castle nut and washers.
3. Remove the hub assembly from the vehicle and
remove the (4) bolts retaining the disc to the hub.
4. Clean the wheel hub mating surface and install new
disc on wheel hub.
5. Install new bolts and torque to specification.
Brake Disc Thickness
New: .188” (4.78 mm)
Service Limit: .170” (4.32 mm)
Brake Disc Thickness Variance
Service Limit: .002” (.051 mm)
Difference Between Measurements
Brake Disc Runout:
Service Limit: .010” (.254 mm)
Side
View
Front
View
Measure
Thickness
Always use new brake disc mounting bolts. The
bolts have a pre-applied locking agent which is
destroyed upon removal.
Brake Disc Mounting Bolts:
30 ft-lbs (41 Nm)
Cotter
Pin
Washers
Nut
(4) Bolts
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