Hisun HS500 Owner's Manual page 159

8-56 Periodic Maintenance and Adjustment
Table 2：Solution of Common Problems in Brake System
S/N Problems
1 Locked braking system
Brake performance
2
decreases
Grinding noises from front
brake or brake rotor
3
become red during
operation due to heat.
Grinding noises from front
brake or brake rotor
4
become red during
operation due to heat.
Solutions
1. Check whether brake disc plates deformed or damaged.
2. Check whether hydraulic cylinder is locked or brake clamp
assembly parts are deformed or damaged.
1. Check the disc brake pads for excessive wear.
2. Check the brake pads and rotor disc for excessive wear or
oil which might have gotten on either.
3. Check brake fluid and refill if necessary.
1. Check brake rotor for excess wear.
2. Check whether hydraulic cylinder is locked or brake clamp
assembly parts are deformed or damaged.
1. Check whether brake disc plates deformed or damaged.
2. Check whether hydraulic cylinder is locked or brake clamp
assembly parts are deformed or damaged.
3. Check if rear brake is locked and will not release. Check if
the parking brake is in the "ON" position.