Brake Controls Overview; Brake Noise Troubleshooting - Polaris 2014 Sportsman 570 EF Service Manual

BRAKES

Brake Controls Overview

All Models (Excluding Forest and Intl.)
The Sportsman brake system consists of a complete
hydraulic brake system. All-wheel braking is integrated
into the hand brake systems and rear-wheel braking may
be applied by pressing the auxiliary pedal. Either control
may be applied separately, or at the same time.
When the foot brake is applied, the rear brake caliper is
active, as braking pressure is routed from the foot brake
master cylinder through the line to the rear caliper.
When the hand brake is applied, all brake calipers are
active, as braking pressure is routed from the hand brake
master cylinder through the distribution block, exiting two
lines to the front calipers, while the other line feeds the
line to the rear caliper.
Forest / Intl.
The Sportsman brake system consists of a complete
hydraulic brake system. All-wheel braking is integrated
into the foot brake and hand brake systems and allows 4
wheel braking from either control separately, or at the
same time.
When the foot brake is applied, all brake calipers are
active, as braking pressure is routed from the foot brake
master cylinder through the proportioning valve and
distribution block, exiting one line to the front calipers,
while the other line exits the proportioning valve and
feeds the outer line of the rear calipers.
When the hand brake is applied, all brake calipers are
active, as braking pressure is routed from the hand brake
master cylinder through the distribution block, exiting one
line to the front calipers, while the other line feeds the
inner line of the rear calipers.
When servicing Polaris ATV brake systems, use only
Polaris DOT-approved brake fluid.
WARNING
Once a bottle is opened, use what is necessary and
discard the rest in accordance with local laws. Do not
store or use a partial bottle of brake fluid. Brake fluid is
hygroscopic, meaning it rapidly absorbs moisture. This
causes the boiling temperature of the brake fluid to
drop, which can lead to brake fade and the possible
loss of control.
9.6

Brake Noise Troubleshooting

Dirt or dust buildup on the brake pads and disc is the
most common cause of brake noise (squeal caused by
vibration). If cleaning does not reduce the occurrence of
brake noise, a product such as Permatex Disc Brake
Quiet can be applied to the back of the pads. Follow
directions on the package. This will keep pads in contact
with caliper piston (s) to reduce the chance of squeaks
caused by dirt or dust.
POSSIBLE CAUSE
Dirt, dust, or imbedded
material on pads or disc
Pad(s) dragging on disc
(noise or premature pad
wear)
Insufficient lever or pedal
clearance
Master cylinder reservoir
overfilled
Master cylinder
compensating port
restricted, Master cylinder
piston not returning
completely, Caliper piston
(s) not returning
Operator error (riding the
brake / park brake applied)
Loose wheel hub or
bearings
Brake disc warped or
excessively worn
Brake disc misaligned or
loose
Noise is from other source
(chain, axle, hub, disc or
wheel)
Wrong pad for conditions
9924871 R03 - 2014 Polaris Sportsman® 570 EFI Service Manual
© Copyright 2013 Polaris Sales Inc.
REMEDY
Spray disc and pads with
CRC Brakleen™ or
equivalent non-flammable
aerosol brake cleaner.
Remove pads and/or disc
hub to clean imbedded
material from disc or pads.
Adjust pad stop
Set to proper level
Check brake fluid level,
adjust as needed
Clean piston(s) seal
Educate operator
Tighten wheel, hub nuts or
replace bearings if worn
Replace disc
Inspect and repair as
necessary
If noise does not change
when brake is applied
check other sources.
Inspect and repair as
necessary
Change to a softer or
harder pad (if available)