10
9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
10.35
TROUBLESHOOTING
BRAKES SQUEAL / POOR BRAKE
PERFORMANCE
• Air in system
• Water in system (brake fluid contaminated)
• Caliper/disc misaligned
• Caliper dirty or damaged
• Brake line damaged or lining ruptured
• Worn disc and/or friction pads
• Incorrectly adjusted stationary pad
• Worn or damaged master cylinder or components
• Damaged break pad noise insulator
PEDAL VIBRATION
• Disc damaged
• Disc worn (runout or thickness variance exceeds
service limit)
CALIPER OVERHEATS (BRAKES DRAG)
• Compensating port plugged
• Pad clearance set incorrectly
• Parking brake lever incorrectly adjusted
• Brake pedal binding or unable to return fully
• Parking brake left on
• Residue build up under caliper seals
• Operator riding brakes
BRAKES LOCK
• Alignment of caliper to disc
• Caliper pistons sticking
• Improper assembly of brake system components
BRAKE WARNING SYSTEM (INTL
MODELS)
• This vehicle uses a brake monitoring system with full
plausibility check. This system uses a brake pedal
switch mounted to the pedal, and either one or two
brake pressure switches mounted on the master
cylinder.
• For this system to operate correctly. The Brake
Pressure Switch and Brake pedal switch need to close
within an acceptable amount of time.
• When the pressure switch or pedal switch changes
their status, the ECU waits 3 seconds to receive the
second signal.
– Example : When the brake pedal is depressed, the
Brake Pedal Switch changes status from closed to
open. The ECU then waits 3 seconds for the
pressure switch signal. If not received the Brake
Warning Light will be switched ON. Reverse
plausibility is monitored as well (system works in
opposite as well). If pressure switch changes status
first, the ECU waits 3 seconds for the status
change of the Brake Pedal Switch. If the signal is
not received, the Brake Warning Light will be
turned ON.
• If the Brake warning light is active, refer to Brake
Warning System Inspection (INTL Models) page 10.36
for testing procedures.
BRAKE SYSTEM
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