Remove/install ETS/ASR/ESP hydraulic unit - AR42.40-P-0816RK

MODEL 231

Fig 1: ETS/ASR/ESP Hydraulic Unit Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	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
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
1	Switch off ignition and remove transmitter key (A8/1) or KEYLESS-GO start/stop button (S2/3) from electronic ignition lock control unit (N73)	KEYLESS-GO start/stop button (S2/3) only with code (889) KEYLESS-GO.
2	Open engine hood
3	Remove engine air intake duct (7)
4	Unhook line (1)
	Clean
5	Clean traction system hydraulic unit (A7/3) in the area of the brake line connections	Before opening the hydraulic system, thoroughly clean the area surrounding the separation point. Otherwise minute particles of dirt in the hydraulic components can result in malfunctions and total failure of the hydraulic system. Only use clean, lint free rags and cleaner free of mineral oil. Do not use any compressed-air for cleaning when the brake system is open. Assembly cleaner	*BR00.45-Z-1028-04A
6	Disconnect electrical connection (4) on Electronic Stability Program control unit (N30/4)	Model 231 with code 233 (DISTRONIC PLUS)	AR42.45-P-0820-02EWD
		Model 231 except code 233 (DISTRONIC PLUS)	AR42.45-P-0820-02EW
		The work instructions for disconnecting the electrical connection (4) must be followed. Otherwise damage can be caused to the locking mechanism. Do not touch, deform or damage contacts of electrical connection (4) and of jack on Electronic Stability Program control unit (N30/4). Do not allow any foreign objects, dirt or fluids to enter the jack or the electrical connection (4). Otherwise the Electronic Stability Program control unit (N30/4) may be damaged or may malfunction. Unlocking tool	Fig 3
7	Identify brake line (3) relative to the corresponding connection on the traction system hydraulic unit (A7/3)
8	Detach brake lines (3) from traction system hydraulic unit (A7/3)	Seal brake lines (3) and connections on traction system hydraulic unit (A7/3). Otherwise the traction system hydraulic unit (A7/3) may be damaged by the entry of foreign objects. Pay attention to stress/chafe-free routing of brake lines (3).
		Retaining screw, brake line to hydraulic unit	*BA42.10-P-1004-04L
		Box wrench bit	Figure
		Adapter coupling	Fig 4
		Record plug	Figure
		Box wrench bit	Fig 2
9	Unhook heater circulation pump (6) and place to one side with lines connected
10	Unscrew screws/bolts (2) and remove traction system hydraulic unit (A7/3)	Bolt/nut, bracket for hydraulic unit to body	*BA42.45-P-1004-01M
11	Install in the reverse order
12	Perform calibration of Electronic Stability Program control unit (N30/4) with Star Diagnosis	When installing a new traction system hydraulic unit (A7/3).	AD00.00-P-2000-04A
13	Bleed brake system		AR42.10-P-0010RK
14	Read out and erase fault memory		AD00.00-P-2000-04A