Coleman HS400UTV-2 Owner's Manual page 158

8-54 Periodic Maintenance and Adjustment
Table 2：Solution of Common Problems in Brake System.
S/N Problems
1 Brake system is locked up.
Brake performance is
2
diminished.
Check parking brake, make sure it is not set.
Check if the brake discs are deformed.
Check if the calipers' hydraulic cylinders are stuck or the
fixing parts of calipers are deformed.
Check if the brake discs are over-worn.
Check if the brake blocks in calipers are over-worn, or
contaminated by debris.
Check if there is any leakage in the brake system's brake fluid
lines or junctions.
Check if the post rod in the brake master cylinder is deformed.
Check if there is any air in the brake fluid lines. Bleed the lines
if necessary.
Check the brake fluid level in the master cylinders. Make sure
the level is above the low line.
Solutions