Air in the brake system

Bleed the brake system.

Improper rear brake adjustment

Adjust the rear brake linings.

Leaking brake pipe/connection

Locate and fix the brake pipe/connection.

Leaking caliper piston seal

Replace the caliper piston seal.

Leaking master cylinder (internally)

Repair/replace the master cylinder.

Leaking rear wheel cylinder

Repair/replace the rear wheel cylinder.

Leaking proportioning valve

Replace the proportioning valve.

Contaminated/improper brake fluid

Flush the brake system and repair affected brake components.

Uneven lining material

Replace the linings as an axle set.

Front and/or rear brake assembly attachment loose

Locate and tighten loose brake components.

Excessive vehicle loading

See tire placard for vehicle capacity specification.