Install, remove automatic brake adjuster - AR42.10-P-0169MCU

MODEL 451.3/4 

Fig 1: Identifying Automatic Brake Adjuster Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Remove/install
1	Remove left or right brake shoes (3) on the rear axle		AR42.10-P-0165MCU
2	Unhook fastening spring (1) on brake adjuster (2) and on brake shoes (3)
3	Unhook return spring (4) on brake shoes (3)
4	Unhook spring (5) on brake shoes (3)	Installation:  Observe curvature of teeth on adjusting wheel (8). They must curve away in the direction of adjustment (arrow).
5	Pull threaded union (6), spring (5) and adjustment wheel (8) out of the angle (7) in the brake adjuster (2)	The heat shield (9) must be located in the center of the angle cutout (7), as otherwise the drum brake function may be impaired. Installation:  Check the direction of the brake adjustment, in the process pressing against the elbow (7) and relieving the load again. Observe the installation position of the brake adjuster (2): Right side = Left-hand thread on brake adjuster (2) Left side = Right-hand thread on brake adjuster (2) The designations on the brake adjusters (2) are invalid.
6	Install in the reverse order
7	Adjust drum brake		AR42.10-P-1010-11SM