.. Power Booster

• Loss of vacuum
• Ruptured diaphragm
• Defective check valve
• Excessive pedal effort

.. Master Cylinder

• Plugged compensating ports
• Dirt/sediment in reservoir
• External fluid leakage
• Pedal drops to floor
• Deteriorated cups/seals

.. Caliper

• Frozen/cocked piston
• External fluid leakage
• Defective mounting hardware
• Broken bleeder screw
• Will not slide or float

.. Rotor/Drum

• Beyond machinable limits
• Excessive rotor runout
• Drum warped/out-of-round
• Scored or grooved surface
• Improper surface finish

.. Hoses/Lines

• Deteriorated rubber hoses
• Rusted/corroded metal lines
• Improperly routed lines
• Air in system
• Leaks at fittings/connections

.. Shoes/Pads

• Normal wear
• Grease or oil on linings
• Glazed lining surfaces
• Uneven lining wear
• Excessively noisy