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How can you check the slack adjuster? Park on level ground, turn off parking brakes, pull hard on each slack adjuster. It shouldn't move more than one inch. Park on level ground, turn off parking brake and press brake pedal.

Truck Tips: Mark-and-Measure Brake Adjustment - YouTube YouTube Start of suggested clip End of suggested clip Released. Then with the brakes fully applied measure the distance the Mark is from the face of theMoreReleased. Then with the brakes fully applied measure the distance the Mark is from the face of the brake. Chamber. In this case I placed a piece of tape on the push rod at the face of the chamber.

The most common type of air brake chamber used on trucks and trailers is the Type 30. These chambers have a maximum available stroke of 2½ inches (65 mm).

With service brakes in the released position, mark the push rod even with the brake chamber. Make a full brake application and mark the push rod again. Measure between the two marks to determine the length of push-rod travel (stroke).

The most reliable method for inspecting brake adjustment is to measure the applied pushrod stroke.

To have one brake out of adjustment means an unbalanced system and the loss of 10% of the braking or stopping ability of the entire rig. Two out of adjustment means 20% loss, and at this point, the DOT Regulations put the rig out-of-service.

Use the pivot method for proper braking position. The ball of your foot should comfortably reach the center of the brake pedal (if not, you may need to adjust your seat position). From there, simply keep your heel planted and pivot your right foot forward to apply pressure to either pedal.