GUARD AS 1845135 - Caterpillar

Illustration 1 g00894307
Slack adjuster for the front brakes
Illustration 2 g00893584
Slack adjuster for the rear brakesOperation of the slack adjuster keeps the timing constant between the pushing of the service brake pedal and the stopping of the machine. Because of the slack adjuster, the same brake application will work with new brakes or with worn brakes. A slack adjuster is in the oil systems for the front brakes and for the rear brakes. The slack adjuster is full of oil. The slack adjusters are located between the service brake/retarder relay valves and the brakes.When the operator depresses the service brake pedal or the operator engages the retarder system the pilot oil flows into the relay valve for the service brake. Reduced pressure oil then flows from the relay valve for the service brake to the two slack adjusters and the two brake control valves. The relay valve for the service brake initially provides the