Air Brake Manual


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Brake adjustment

Slack adjusters

Slack adjusters are mechanical links between the brake-chamber push rod and the camshaft on cam type brakes. Slack adjusters are not used with wedge-type brakes.

Slack adjusters are used to manually (Fig. 51) or automatically (Fig. 53) maintain proper brake chamber stroke and lining-to-drum clearance during normal operation.

Slack adjusters are available in a variety of arm configurations, lengths, torque ratings and spline types.

The entire slack adjuster operates as a unit, rotating with the brake camshaft as brakes are applied or released. The most efficient braking occurs when push rod travel is held to a minimum, therefore it is important that brake adjustments are made often.

Trailer spring-brake valve
Figure 51. Manual slack adjuster

Disclaimer

Rev: 2018