Air in the brake system

Bleed the brake system.

Improper rear brake adjustment

Adjust the rear brake linings.

Leaking brake pipe or connection

Locate and repair the brake pipe or the connection.

Leaking caliper piston seal

Replace the caliper piston seal.

Leaking master cylinder (internally)

Repair or replace the master cylinder.

Contaminated/improper brake fluid

Flush the brake system and repair the affected brake components.

Uneven lining material

Replace the linings as an axle set.

Loose front or rear brake assembly attachment

Locate and tighten loose brake components.

Excessive vehicle loading

Refer to tire placard for the vehicle capacity specification.