Out-of-adjustment brakes and brake system violations combine to represent half of all out-of-service violations issued for commercial vehicles on the road. Brake systems that are improperly installed or poorly maintained can reduce the braking capacity and stopping distance of trucks or buses, a serious safety risk.
Drivers can inspect their brake systems every day. Even if you can’t go under the vehicle, you can listen for air leaks, check low air signals and look for component damage. If you can go under your vehicle, you can measure pushrod stroke the same way a CVSA-certified inspector does, and compare the results to the pushrod stroke limits set by regulation.
See regulation stroke limits here: http://www.cvsa.org/programs/op_airbrake_brake_systems.php#limit_1