Polaris Sportsman 400 Service Manual page 313

BRAKES
MASTER CYLINDER DISASSEMBLY
1. Remove cover and diaphragm from master cylinder
and dispose of the fluid properly.
2. Be sure vents in cover are clean and unobstructed.
3. Remove brake lever.
4. Clean surfaces of the reservoir and master cylinder
body. Be sure supply port is clean before reassembly.
5. Remove outer dust seal. Be ready to catch piston
assembly. NOTE: The return spring may force piston
out when dust seal has been removed.
6. Remove piston assembly and return spring from
master cylinder. Replace piston assembly and spring.
9.10
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Supply Port
Vent Slots
Cover
Outer Dust Seal