Remove/Install ETS/ASR/ESP® Hydraulic Unit - AR42.40-P-0816LF

Model 217, 222

MODIFICATION NOTES

04.04.2014	Operation steps added.	Operation steps 7 and 8
07.08.2014	Retaining screw, brake line to hydraulic unit	MODEL 217 except AMG	BA42.10-P-1004-04N
07.08.2014	Retaining screw, brake line to hydraulic unit	MODEL 217 AMG	BA42.10-P-1004-04N

Shown on MODEL 222.057

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA

Shown on MODEL 222.082

	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
Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Topical note	Brake fluid notes		AH42.50-P-0001-01A
Topical note	Notes on repairs to brake system		AH42.00-P-0003-01A
	Remove/install
1	Switch off ignition and remove transmitter key
2	Remove left front wheel well strut (1)		AR82.30-P-6400LF
3	Unscrew nuts (2), detach engine fuse and relay module (K40/8) and place to one side
	Clean
4	Clean traction system hydraulic unit (A7/3) around connections of brake lines (4)	Before the hydraulic system is opened, the area around the connections must be cleaned thoroughly. 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
5	Clean area surrounding cap of hydraulic fluid reservoir for brake fluid (7)	Model 222.004/057/104/157
		Assembly cleaner	*BR00.45-Z-1028-04A
6	Disconnect electrical connector (3) from ESP® control unit (N30/4)	The work instructions for disconnecting the electrical connector (3) must be followed. Otherwise damage can be caused to the locking mechanism. Do not touch, deform or damage the contacts of the electrical connector (3) and the jack at the ESP® control unit (N30/4). Do not allow any foreign objects, dirt or fluids to enter into the jack or the electrical connector (3). Otherwise the Electronic Stability Program control unit (N30/4) may be damaged or may malfunction.	AR42.45-P-0820-02EW
		Unlocking tool	Fig 2
7	Unscrew cap of hydraulic fluid reservoir for brake fluid (7) and extract brake fluid	Model 222.004/057/104/157
8	Detach feed hose (6) from hydraulic fluid reservoir for brake fluid (7)	Model 222.004/057/104/157 Protect painted surfaces from brake fluid. Otherwise damage can occur to the vehicle paint.
		Record plug	Fig 5
9	Mark brake lines (4) relative to corresponding connection at traction system hydraulic unit (A7/3)
10	Detach brake lines (4) from traction system hydraulic unit (A7/3)	Seal the brake lines (4) and connections on the traction system hydraulic unit (A7/3). Otherwise the traction system hydraulic unit (A7/3) may be damaged by the entry of foreign objects. : Ensure that brake lines (4) are routed free of tension and chafing.
		MODEL 217, 222 Retaining screw, brake line to hydraulic unit	*BA42.10-P-1004-04N
		Box wrench bit	Fig 3
		Record plug	Fig 5
		Adapter coupling	Fig 1
		Box wrench bit	Fig 4
11	Unscrew bolts (5) and remove traction system hydraulic unit (A7/3)
12	Install in the reverse order
13	Bleed brake system		AR42.10-P-0010LF
14	Read out and erase fault memory
			AD00.00-P-2000-04B