Damaged vacuum booster

Replace the vacuum booster.

Brake pedal linkage interference/binding

Repair/replace the brake pedal linkage.

Contaminated/improper brake fluid

Flush the brake system and repair the affected brake components.

Restricted passage in the vacuum booster

Locate and fix the source of the vacuum restriction in the vacuum booster.

Restricted brake fluid passage

Locate and fix the source of the brake fluid restriction.

Sticky caliper or caliper pistons

Repair/replace the caliper.

Parking brake not releasing

Malfunctioning parking brake lever or frozen parking brake cables.

Caliper to knuckle clearance

Repair as necessary.

Missing or weak pedal-return spring

Replace the pedal-return spring