Disc Runout; Disc Inspection - Polaris ACE 900 2017 Service Manual

BRAKE SYSTEM
7. Field test unit for proper braking action before putting
into service. Inspect for fluid leaks and firm brakes.
Make sure the brake is not dragging when pedal is
released. If the brake drags, re-check assembly and
installation.
If new pads are installed, refer to "Brake Burnishing
Procedure" page 9.17.

DISC RUNOUT

1. Mount dial indicator as shown to measure disc
runout. Slowly rotate the disc and read total runout
on the dial indicator. Replace the disc if runout
exceeds specification.
NOTICE
Image for reference only.
MEASUREMENT
Brake Disc Runout)
Service Limit: .010" (.254 mm)
9.16
NOTE

DISC INSPECTION

1. Visually inspect disc for scoring, scratches, or
gouges. Replace the disc if any deep scratches are
evident.
2. Use a 0-1" micrometer and measure the disc
thickness at eight different points around the pad
contact surface. Replace disc if worn beyond service
limit.
MEASUREMENT
Brake Disc Thickness
New: .150-.165" (3.81-4.19 mm)
Service Limit: .135" (3.429 mm)
MEASUREMENT
Brake Disc Thickness Variance
Service Limit: .002" (.051 mm)
difference between measurements
9929422 R02 - 2017-2019 ACE 900 Service Manual
© Copyright Polaris Industries Inc.