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

MODEL 463.202 /222 /236 /237 /303 /306 /336 /340 / 341 /346

Shows model 463.303

Fig 1: Identifying Traction System Hydraulic Unit With Electrical Connector And Brake Lines

Courtesy of MERCEDES-BENZ USA

MODIFICATION NOTES

15.1.11	Clean area surrounding the electrical connector and brake lines, added	Operation step 3
	Box wrench bit 140 589 00 03 00, added	Step 5

	Remove/install
	Risk of explosion caused by escaping oxyhydrogen gas. Risk of injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte (contains diluted sulfuric acid) or metal spatter due to short circuit. Risk of burn injuries caused by short circuit. Risk of poisoning caused by swallowing battery electrolyte (contains diluted sulfuric acid) or absorption of lead over the skin or orifices	No fire, sparks, open flames or smoking. Wear acid-resistant gloves and clothing and safety glasses with side guards. Do not place any conductive objects on the battery and avoid any short circuit from battery positive to ground. Only fill liquid battery electrolyte (diluted sulfuric acid) into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
	Risk of poisoning caused by swallowing brake fluid. Risk of injury caused by brake fluid coming into contact with skin and eyes.	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 accident when commissioning the vehicle due to a lack of braking effect when the service brake is operated for the first time after repair work	Before starting engine, actuate brake pedal several times until the pressure is built up and maintained in the brake system.	AS42.50-Z-0002-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Brake fluid notes		AH42.50-P-0001-01A
1.1	Disconnect battery ground line	Except model 236 with code (979) Special protection version. Model 463.306/ 336/ 346	AR54.10-P-0003G
		Model 463.236 with code (979) Special protection version, with code (ZS6) Special protection version FB6, with code (E26) Additional battery 100 Ah incl. cutoff relay Model 463.236 with code (979) Special protection version, with code (ZS7) Special protection version FB7, with code (E26) Additional battery 100 Ah incl. cutoff relay	AR54.10-P-0003PM
	Notes on battery		AH54.10-P-0001-01A
1.2	Turn key in ignition lock to position "0"	Model 463.306/ 336/ 346
2	Suction off brake fluid from brake fluid reservoir
	Clean
3	Clean area surrounding electrical connector (1) and brake lines (2)	Before opening the brake system the area around the separation point should be cleaned thoroughly. Even the smallest particles of dirt, introduced into the hydraulic components, can lead to malfunctions and a total failure of the brake 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.
3		Cleaner from package	*BR00.45-Z-1028-04A
4	Mark brake lines (2) to connections on hydraulic unit traction system (A7/3)
5	Detach brake lines (2) from hydraulic unit (A7/3)	Seal off connections immediately using stop plugs to prevent large quantities of brake fluid reservoir leaking. Collect escaping brake fluid using a suitable container. Installation: note markings.
			*BA42.10-P-1004-04B
			Fig 2
			Fig 3
			Fig 5
			Fig 4
6	Release and disconnect electrical connector (1)
	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
7	Remove hydraulic unit (A7/3) from bracket.	Installation: Check all rubber grommets for signs of damage and correct seating, replace if necessary.
	Clean
8	Remove escaped brake fluid	Rinse contaminated parts immediately with water, as otherwise paint damage may occur.
9	Remove carrier from hydraulic unit (A7/3)	When replacing the hydraulic unit (A7/3)
10	Install in the reverse order
11	Bleed brake system	Except model 463.236 with code (979) special protection version.	AR42.10-P-0010GG
11	Bleed brake system	Model 463.236 with code (979) Special protection version	AR42.10-P-0010GS
	Checking
12	Check brake system in vicinity of ESP hydraulic unit (A7/3) for signs of leaks
13	Read out and erase the fault memory using Star Diagnosis		AD00.00-P-2000-04A
14	Conduct programming of ESP control unit
15	Carry out calibration of turn rate sensor with STAR DIAGNOSIS
16	Detach STAR DIAGNOSIS