Manual Brake Adjuster

A Manual Slack Adjuster - MSA (also called a Manual Brake Adjuster) is a mechanical component in the air brake linkage. This component is used to remove the slack created by wear on the friction element of the brake shoes that normally occurs during operation of the vehicle. This is done manually with the aid of a wrench while the vehicle is being serviced.

There are two varieties in this segment of Slack Adjuster:

Straight-arm slack adjusters are manual slack adjusters that feature a straight arm.

Offset arm slack adjusters are manual slack adjusters that feature an offset arm.