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

MODEL 451.3/4 

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

Courtesy of MERCEDES-BENZ USA

	Remove
	Risk of poisoning  from swallowing brake fluid. Risk of injury  from skin and eye contact with brake fluid	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-1010MCC
	Check
2	Clean automatic adjuster (4) and check for damage and ease of movement
	Install, remove automatic brake adjuster		AR42.10-P-0169MCC
		Use a commercially available brake cleaner. If necessary: ↓ Install new automatic brake adjuster (4), subject to separate repair order.
3	Check ease of movement and leaktightness of wheel brake cylinder (3) as well as condition and wear of brake shoes (1)
	Remove/install wheel brake cylinder		AR42.10-P-0167MCC
	Remove/install brake shoes at rear axle		AR42.10-P-0165MCC
		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: ↓ Install new wheel brake cylinder (3) or brake shoes (1), subject to separate repair order.
	Install
4	Install brake drum
	Remove/install brake drum		AR42.10-P-1010MCC