Honda TRX420FPM Owner's Manual page 160

Brakes
Worn brake pads should be replaced. If the pads are not worn, have your
brake system inspected for leaks.
Other Inspections
Make sure there are no fluid leaks.
Check for deterioration or cracks in the hoses and fittings. If the hoses
are worn or cracked, have them replaced by your dealer.
Servicing Your Honda
152