Remove/install electronic stability program (ESP) hydraulic unit - AR42.45-P-0817MCU

MODEL 451.3/4 with CODE 494 (US version)

Fig 1: Identifying Electronic Stability Program Hydraulic Unit Remove/Install Components

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
	Risk of death when touching components on vehicles with high-voltage on-board electrical system	Do not touch components and open lines of the high-voltage on-board electrical system. Persons who wear electronic implants (e.g. cardiac pacemakers), must not carry out any work on high-voltage on-board electrical systems.	AS54.00-Z-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Note on high-voltage on-board electrical system		AH54.00-P-0010-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Remove transmitter key and mains plug	Model 451.39/49 with code 494 (US version)
2.1	Perform disable for the high-voltage on-board electrical system	Model 451.391/491 with code 494 (US version) After completing the work, enclose initial startup log together with the power disable enable log with the vehicle file.	AR54.10-P-1160MEV
2.2	Connect Star Diagnosis and disable high-voltage on-board electrical system	Model 451.390/490 with code 494 (US version)
	Print the power disable event log and add to the vehicle file. : Put the high-voltage on-board electrical system into operation.		AD00.00-P-2000-04MCC
3	Remove maintenance flap
4	Unscrew cap of brake fluid expansion reservoir and extract brake fluid
	Risk of death caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
5	Raise vehicle with vehicle lift
6	Remove high-voltage battery	Model 451.391/491 with code 494 (US version)	AR54.10-P-1140MEV
		Model 451.390/490 with engine 780.993 with code 494 (US version)	AR54.10-P-1140MEX
7	Remove bulkhead wall	Model 451.431 with code 494 (US version)	AR61.25-P-6600MCU
8	Unscrew nut (2) and remove folding clamp (3) from screw bolt	Observe installation position of brake lines (4, 5) and electrical lines.
9	Unclip brake lines (4, 5) from bracket (6)
10	Unclip brake line (7) from bracket (8)
11	Loosen nuts (9), unscrew bolts (10) and remove bracket (11)	: Move guide pin (12) on hydraulic unit (1) into bracket (11). Screw/bolt, ESP hydraulic unit bracket to floor panel	*BA42.45-P-1008-01F
12	Support hydraulic unit (1) using telescopic lifter and removal fixture
	000 588 11 62 00 Major assembly mount		WS01.00-P-0092B
		Removal fixture	Figure
13	Check color coding of threaded connections of brake lines (13) to hydraulic unit (1)	: Label brake lines (13) accordingly.	AR42.10-P-0013-05MCC
14	Loosen and disconnect threaded connections of brake lines (13) to hydraulic unit (1)	Collect brake fluid in a suitable container. Seal connections using suitable plugs. : Use 12 mm plug-in open end wrench. Do not bend the brake lines (13); make sure that they are routed correctly, are leaktight and are clear of other components. Brake line to ESP hydraulic unit	*BA42.10-P-1010-04E
		If a brake line (13) with red marking has been released, this brake line (13) must be replaced. ↓ Remove/install brake line from the master brake cylinder to the ESP hydraulic unit	AR42.10-P-0034MCU
15	Carefully lower hydraulic unit (1) until brake lines (4, 5, 7, 14) are accessible
16	Check the bolted connections of the brake lines (4, 5, 7, 14) with the hydraulic unit (1) for color coding	: Mark brake lines (4, 5, 7, 14) accordingly.	AR42.10-P-0013-05MCC
17	Loosen bolted connections of brake lines (4, 5, 7, 14) with the hydraulic unit (1) and separate	Observe installation location of brake lines (4, 5, 7, 14). Collect brake fluid in a suitable container. Seal connections using suitable plugs. : Do not bend the brake lines (4, 5, 7, 14); pay attention to their routing, leaktightness and clearance. Brake line to ESP hydraulic unit	*BA42.10-P-1010-04E
		Socket wrench set	Figure
18	Unlock and separate electrical connector (15) on ESP control unit (N47-5)
19	Remove hydraulic unit (1)
20	Replace brake line (4, 5, 7, 14)	Only if a brake line (4, 5, 7, 14) with red color coding has been released. Remove/install left front brake line	AR42.10-P-0032MCU
		Remove/install right front brake line	AR42.10-P-0033MCU
		Remove/install brake line from the ESP hydraulic unit to the rear axle	AR42.10-P-0035MCU
21	Install in the reverse order
22	Bleed brake system		AR42.10-P-0010MCU
23	Connect STAR DIAGNOSIS, perform swap check and read out fault memory
			AD00.00-P-2000-04MCC