Remove/Install Master Brake Cylinder - AR42.10-P-0300ME

Model 167

Fig 1: Master Brake Cylinder Components Location - Model 167

Courtesy of MERCEDES-BENZ USA

	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
Notice	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
Notice	Brake fluid notes		AH42.50-P-0001-01A
Notice	Notes on repairs to brake system		AH42.00-P-0003-01A
	Notes on safety-relevant components		AH00.00-Z-0019-01A
	Remove/install
1	Reduce vacuum in brake booster (5) by depressing brake pedal several times.
2	Remove brake fluid reservoir.		AR42.10-P-0308ME
3	Remove engine compartment pre-fuse box (F150/3) and place to one side with attached electric lines.		AR54.15-P-1330ME
4	Clean master brake cylinder (1) in the area of the connections of the brake lines (2, 3).	Thoroughly clean area around connecting points before opening brake system. Otherwise minute dirt particles in the hydraulic components result in malfunctions and total failure of the brake system. Use clean, lint-free rag only. Do not use any compressed air for cleaning when the brake system is open.
		Assembly cleaner	*BR00.45-Z-1028-04A
5	Mark brake lines (2, 3) with corresponding connections.
6	Remove brake lines (2, 3) from master brake cylinder (1) and seal openings using suitable stop plugs.	Seal connection fittings at master brake cylinder (1). Otherwise, foreign objects can enter and cause damage to the master brake cylinder (1).
		Brake pipe to master brake cylinder	*BA42.10-P-1003-04J
		Record plug	Fig 3
		Box wrench bit	Fig 2
7	Unscrew nuts (4).	Replace nuts (4).
		Nut, brake master cylinder to brake booster	*BA42.10-P-1001-05H
8	Guide master brake cylinder (1) out of brake booster (5) and remove.	Collect the brake fluid which runs out using an absorbent rag. Otherwise, the paint will be damaged.
		Do not tilt the master brake cylinder (1); pull it forward and in a straight line out of the brake booster (5). Otherwise the push rod is pushed out of its axial position.
		Replace seal (6).
9	Install in the reverse order.
	Concluding tasks
10	Bleed brake system.		AR42.10-P-0010ME
11	Check brake system for leak tightness.		AR42.10-P-0100-01ME
12	Perform brake test on test stand.