Removing and installing electronic stability program (ESP) hydraulic unit - AR42.45-P-0817V

MODELS 171.442 /454 /456 /473 

Illustrated on model 171.442 

Fig 1: Identifying Electronic Stability Program (ESP) Hydraulic Unit Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of poisoning  caused by swallowing brake fluid. Risk of injury  caused by brake fluid coming into contact with skin and eyes.	Pour brake fluid only into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.	-
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
1	Ignition off and disconnect key from the electronic ignition switch control unit
	Risk of injury  caused by fingers being jammed or pinched  when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.	When moving components, ensure that no body parts or limbs are within the operating range of moving parts.	-
2	Open engine hood and raise to vertical position		AR88.40-P-1000V
3	Clean traction systems hydraulic unit (A7/3) around the line connections	Before opening the brake system, clean the area around the separation point thoroughly. Even the smallest dirt particles, introduced into the hydraulic components, can lead to malfunctions and a total failure of the hydraulic system
4	Detach brake lines (1) from traction system hydraulic unit (A7/3)	Before detaching, identify brake lines (1) relative to the corresponding line connection, in the process observe markings on the traction system hydraulic unit (A7/3) (arrow). Trace line routing to the corresponding wheel. Collect any brake fluid which runs out in a fluff-free, absorbent cloth. Seal the brake lines (1) and line connections on the traction system Traction system hydraulic unit (A7/3) immediately with stop plugs in order to prevent the ingress of foreign objects. Installation:  Do not mix up brake lines (1), observe markings.
			*BA42.45-P-1008-01B
		Ring wrench socket	Figure
		Ring wrench socket	Fig 3
		Set of plugs	Figure
5	Unlock electrical connector (2) and detach from ESP and BAS control unit (N47-5)
6	Pull the traction system hydraulic unit (A7/3) with bracket (3) out of the rubber support (4)	Flush off brake fluid which runs out in the area of the longitudinal frame member with water in order to avoid paint damage.
7	Detach bracket (3) from traction system hydraulic unit (A7/3); to do this, unscrew bolts (5)		*BA42.45-P-1010-01B
		Torx bit set	Fig 5
8	Install in the reverse order
9	Bleed brake system		AR42.10-P-0010V
	Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near engine	Secure vehicle to prevent it from moving. Wear closed and snug-fitting work clothes. Do not grasp hot or rotating parts.	-
10	Check brake system for leaks		-

ELECTRONIC STABILITY PROGRAM (ESP)

Number	Designation			Model 171
BA42.45-P-1008-01B	Union nut, brake line to traction system hydraulic unit	M10x1	Nm	18
		M12x1	Nm	18
BA42.45-P-1010-01B	Bolt, traction system hydraulic unit to bracket		Nm	8

Fig 2: Identifying Ring Wrench Socket (000 589 75 03 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Ring Wrench Socket (140 589 00 03 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Set Of Plugs (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Torx Bit Set (000 589 01 10 00)

Courtesy of MERCEDES-BENZ USA