Remove/Install Electronic Stability Program (ESP ®) Hydraulic Unit - AR42.45-P-0817GQ

Model 166, 292

Fig 1: Electronic Stability Program (ESP ®) Hydraulic Unit Components Location - Model 166 (Shown On Model 166.057)

Courtesy of MERCEDES-BENZ USA

Shown on model 166.057

	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
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Remove/install
1	Connect vehicle diagnosis system and store basic data from ESP® control unit (N30/4)	Only when replacing the traction system hydraulic unit (A7/3).
			AD00.00-P-2000-04A
2	Switch off ignition and store transmitter key outside of transmission range (min. 2 m)
3	Open hood	Model 166	AR88.40-P-1000GQ
4	Remove left intake air duct	Model 166, 292 with engine 642
5	Clean traction system hydraulic unit (A7/3) in area of brake lines (1)	Before opening the brake system, the area around the separating point must be cleaned thoroughly. Even the smallest dirt particles, introduced into the hydraulic components, can lead to malfunctions and a total failure of the brake system.
6	Mark brake lines (1) for corresponding connection
7	Detach brake lines (1) from traction system hydraulic unit (A7/3)	Make sure that the routing of the brake lines (1) is unstressed and free of any chafing. Union nut, brake line to ESP® hydraulic unit	*BA42.45-P-1002-01J
		Box wrench bit	Fig 4
		Box wrench bit	Fig 2
8	Seal exposed lines immediately	Record plug	Fig 3
9	Remove screws (2)	Screw/bolt, ESP® hydraulic unit to bracket	*BA42.45-P-1003-01J
10	Disconnect electrical connector (3) from ESP® control unit (N30/4)	Model 166, 292 with code 233 (DISTRONIC PLUS)	AR42.45-P-0820-02EWD
		Model 166, 292 except code 233 (DISTRONIC PLUS) The work instructions for disconnecting the electrical connector (3) must be followed. Otherwise damage can occur on the locking mechanism. Do not touch, deform or damage contacts of electrical connector (3) and jack. Do not allow any foreign objects, dirt or fluids to enter into the electrical connector (3) or jack. Otherwise, damage and malfunction can occur.	AR42.45-P-0820-02EW
11	Remove traction system hydraulic unit (A7/3)
12	Check that elastomer bearing (4) on bracket (5) is in good condition and not damaged	Screw/bolt, bracket to body If a problem arises ↓ Replace elastomer bearing (4)	*BA42.45-P-1004-01J
13	Install in the reverse order
14	Bleed brake system		AR42.10-P-0010CW
	Commissioning
15	Perform SCN coding of ESP® control unit (N30/4)	Only when replacing the traction system hydraulic unit (A7/3).	AR54.21-P-0015X
16	Transfer previously stored basic data to ESP® control unit (N30/4)	Only when replacing the traction system hydraulic unit (A7/3).
			AD00.00-P-2000-04A
17	Perform commissioning of ESP® control unit (N30/4)	Only when replacing the traction system hydraulic unit (A7/3).