Check automatic handbrake adjuster - AP42.20-P-4241MCU

MODEL 451.3/4 

Fig 1: Locating Brake Shoes, Dust Boot, Wheel Brake Cylinder And Automatic Adjuster

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Removing
	Risk of poisoning  caused by swallowing brake fluid. Risk of injury  caused by brake fluid coming into contact with skin and eyes.	Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.	AS42.50-Z-0001-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
1	Remove brake drum
	Remove/install brake drum		AR42.10-P-1010MCU
	Check
2	Clean automatic adjuster (4) and check for damage and ease of movement	Use commercially available brake cleaner If necessary: ↓ Replace automatic adjuster (4) subject to separate repair order.
		Install, remove automatic brake adjuster	AR42.10-P-0169MCU
3	Check ease of movement and leaktightness of wheel brake cylinder (3) as well as condition and wear of brake shoes (1)	Press the dust boots (2) carefully on both sides for checking the leaktightness of the wheel brake cylinder (3). If there is the slightest sign of brake fluid escape or sluggishness of the brake pistons in the wheel brake cylinder (3) this must be replaced. If necessary: ↓ Replace wheel brake cylinder (3) or brake shoes (1) subject to separate repair order.
		Remove/install wheel brake cylinder	AR42.10-P-0167MCU
		Remove/install brake shoes at rear axle	AR42.10-P-0165MCU
	Install
4	Install brake drum
	Remove/install brake drum		AR42.10-P-1010MCU