Remove/install brake fluid reservoir - AR42.10-P-0301T

MODEL 211 with Sensotronic Brake Control (SBC) 

MODEL 230 

Fig 1: Identifying Brake Fluid Reservoir Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Brake Fluid Reservoir Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Removing
	Risk of poisoning  caused by swallowing brake fluid. Risk of injury  caused by brake fluid coming into contact with skin and eyes.	Pour brake fluid only 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
1	Switch off ignition
2	Remove cover (1) from reservoir (7)
	Clean
3	Clean area surrounding reservoir (7) thoroughly	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.
		LU cleaner	*BR00.45-Z-1028-04A
4	Unlock and disconnect connector (5) of brake fluid indicator switch (S11)	Put the connector (5) in a safe and protected place; brake fluid must not be allowed to enter the connector.
5	Unscrew cap (2) and take strainer out of reservoir (7)	To prevent paint damage, immediately rinse off any escaped brake fluid using water.
			*BA42.50-P-1001-01D
6	Mark fill level on reservoir (7) and suction off brake fluid
7	Detach hydraulic lines (3a, 3b) from reservoir (7)	Seal connections immediately. Secure the hydraulic lines (3a, 3b) at a high position to prevent brake fluid from escaping and air from entering the hydraulic lines (3a, 3b).
			Figure
8	Detach hydraulic line (4) from reservoir (7)	Vehicles with transmission 716 except Sequentronic automated manual transmission (SEQ), code 424
		Seal off connection immediately. Secure the hydraulic line (4) at a high position to prevent brake fluid from escaping and air from entering the hydraulic line (4).
9	Unscrew bolt (6)
10	Pull reservoir (7) out of brake operating unit (BOU) (8)	The brake fluid must always reach the edge of the openings of the brake operating unit (BOU) (8). Even the smallest particles of dirt, introduced into the hydraulic components, can lead to malfunctions and a total failure of the brake system.
	Install
11	Place reservoir (7) on brake operating unit (BOU) (8)	Installation:  The seals do not have a collar and, when installing the reservoir (7), may be pressed out of the brake operating unit (BOU) (8). Therefore, mount the reservoir (7) vertically on the brake operating unit (BOU) (8) and simultaneously press into the front and rear seals.
12	Fit bolt (6)		*BA42.46-P-1002-02A
13	Attach hydraulic line (4)	Vehicles with transmission 716 except Sequentronic automated manual transmission (SEQ), code 424
14	Fit hydraulic lines (3a, 3b)
15	Fill reservoir (7) up to 10 millimeters below the upper edge of the filler neck with brake fluid	Add brake fluid manually. Do not use a bleeder unit to ensure that air does not enter the brake system. Fill the reservoir (7) correctly as the overflows to the individual chambers are located right at the top of the reservoir upper shell.
16	Mount plug (5)
17	Push together approx. 5-times the hydraulic line (3b) on the SBC hydraulic unit (A7/3)	In order to push any air out of the hydraulic line (3b).
18	Push hydraulic line (4) down as far as possible approx. 5-times	Vehicles with transmission 716 except Sequentronic automated manual transmission (SEQ), code 424 In order to push any air out of the hydraulic line (4).
19	Top up fluid in reservoir (7) up to marking
	Checking
20	Check leaktightness of connecting points of hydraulic lines (3b, 4)	Connect the electric brake fluid change/bleeder unit and apply the maximum filling pressure (2.5 to 3.0 bar) constantly for 10 minutes. Then inspect the hydraulic lines (3b, 4) very closely  for leaks at the connecting points (use a paper tissue). Even the smallest drops of brake fluid are a sign of leakage!
		Visual inspection alone is not enough as even the smallest of leaks, which are not detectable at first glance, can lead to malfunctions in the brake system.
			*WH58.30-Z-1003-24A

Fig 3: Identifying Set Of Stop Plugs (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA