6.44
9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual
© Copyright Polaris Inc.
6. Position the caliper over the piece of steel or wood
with the piece firmly against one of the retracted
pistons.
IMPORTANT
DO NOT PUSH ON THE CALIPER BORE PLUG
u
.
DOING SO WILL BREAK THE PLUG SEAL AND
REQUIRE CALIPER REPLACEMENT.
CAUTION
TO AVOID POSSIBLE INJURY, DO NOT PLACE
FINGERS BETWEEN PISTONS TO ATTEMPT TO
CATCH THEM WHEN APPLYING COMPRESSED AIR.
WEAR EYE PROTECTION WHEN APPLYING
COMPRESSED AIR TO CALIPER.
7. Insert a rubber-tipped air nozzle into the brake hose
inlet port and apply compressed air to push out the
piston
i
.
8. To remove the second piston, lay a rubber sheet on
the steel plate and position the caliper over the rubber
sheet to seal the open piston bore. Repeat step 7.
9. Using a plastic or wood pick, remove both piston
seals
o
from the caliper bores. Discard the seals.
10. Clean the caliper and pistons with denatured alcohol
and dry with either compressed air or a lint-free rag.
11. Inspect the caliper bores and pistons for pitting,
heavy scoring or corrosion. Replace parts if heavily
scored or pitted.
12. To assemble the caliper, lubricate two new piston
seals with new brake fluid. Install each seal by
inserting one point of the seal into the bore groove,
and then work the seal around the groove with your
index finger. Do not twist, or rip the seals.
13. Coat the piston thoroughly with new brake fluid.
Evenly insert each piston into the bores, working
each in by hand carefully and slowly. Push each
piston down until bottomed out.
14. Reinstall the brake caliper on to the chaincase. Install
new caliper fasteners and torque to specification.
TORQUE
Brake Caliper Mounting Fasteners:
40 ft-lbs (54 N·m)
15. Inspect both brake pads prior to installation. If they
are within the pad wear specification, reinstall into
caliper.
16. Install the brake line using the same routing and
orientation noted during removal. Torque fitting to
specification.
TORQUE
Brake Line Banjo Bolt:
240-260 in-lbs (27-30 N·m)
17. Follow the Brake Fluid Replacement and Bleeding
Procedure.
18. Test brake system prior to returning vehicle to
service.