BRAKES
·Incorrect brake adjustment
·Matching tractor&trailer brakes 
 to eliminate jack knifing
·Air system timing v's brake 
 force analysis
·Faulty slack adjuster/s - Cams
·Glazed or contaminated linings 
 oil, grease or brake fluid)
·Seized hydraulic wheel cylinders
·Badly worn S cam shaft bushings
·Faulty air compressor
·Worn or faulty brake pedal
·Faulty Treddle Valve
·Pedal effort to apply brakes
·Pedal to brake timing
·Air pressure to brake timing
·Measure braking to each 
 individual wheel
·Hot spots on the drum
·Drum out of round
·Sticky air valves
·Improper crack values
·Blocked air lines
·Improper brake balance between axles
·Leaking oil seals & worn 
 and damaged components
·Damaged air/hydraulic line&hoses
·Broken spring coils in park brake 
 chamber
·Worn brake linings or drums
·Incorrect brake lining to 
 drum radius
·Problems due to driving habits
·Stopping Distances

STEERING & SUSPENSION
·Worn Tied Rod Ends and Drag Links
·Worn King Pins
·Worn Spring Pins, Shackles & Hangers
·Worn Bushings
·Shock Absorbers
·Loose U Bolts
·Air Bag Integrity

WEIGHT
·Weigh each wheel to detect 
 bent frame
·Weigh vehicle
·Weigh each axle load to check 
 balance

FRAME	
·Loose Bolts
·Cracks in chassis and cross members
·Loose or worn engine&transmission
 mounts
·Loose or worn cab, sleeper mounts
 and bushings

OTHER
·Loose wheel bearings
·High rolling resistance
·Problems in drive line detected 
 through wheels resistance to turn 
·Worn yokes, center bearings
·Loose or worn exhaust