Remove/Install Brake Booster - AR43.10-P-0350MFA

Model 118.### 1#, 177.### 1#, 247.### 1# 

Courtesy of MERCEDES-BENZ USA

Shown on model 177.0 except code ME08 (hybrid drive 75-84 KW VARIANT (INCLUDING PLUGIN)) 

Courtesy of MERCEDES-BENZ USA

Shown on model 177.0 except code ME08 (hybrid drive 75-84 KW VARIANT (INCLUDING PLUGIN)) 

Fig 1: Brake Booster Components Location - Model 118.### 1# (Shown On Model 177.0 Except Code ME08)

Courtesy of MERCEDES-BENZ USA

Shown on model 177.0 except code ME08 (hybrid drive 75-84 KW VARIANT (INCLUDING PLUGIN)) 

Shown on model 177.0 

Courtesy of MERCEDES-BENZ USA

	Risk of fire  due to ignition of R1234yf refrigerant on hot components. Risk of poisoning  caused by inhaling overheated refrigerant vapors. Risk of injury  to skin and eyes caused by contact with escaped R1234yf refrigerant and when working on pressurized parts. Risk of explosion  due to formation of ignitable refrigerant/air mixtures	Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated rooms. Carry out repair work on the air conditioning system circuit only after the system has been evacuated.	AS83.00-Z-0007-01A
	Risk of death  when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)	Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines. Model 177, 247 with engine 282 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))	AS00.00-Z-0035-01A
	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 the engine, actuate brake pedal several times until pressure is built up and maintained in the brake system.	AS42.50-Z-0002-01A
	Risk of poisoning  caused by inhaling overheated refrigerant vapors from an air conditioning system containing R134a. Risk of injury  to skin and eyes caused by contact with liquid R134a refrigerant and when working on pressurized parts	Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated rooms. Carry out repair work on the air conditioning system circuit only after the system has been evacuated.	AS83.00-Z-0006-01A
	Risk of injury  . Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
	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
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Notice	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
Notice	General information on vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system as well as personal protective equipment	Model 177, 247 with engine 282 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))	AH00.00-Z-0300-01A
Notice	Brake fluid notes		AH42.50-P-0001-01A
Notice	Notes on repairs to brake system		AH42.00-P-0003-01A
Notice	Notes on externally invisible brake fluid loss		AH42.10-P-9406-02A
	Notes on safety-relevant components		AH00.00-Z-0019-01A
	Remove/install
1	Reduce vacuum in brake booster (1) by depressing brake pedal several times.
2	Clean area around brake fluid reservoir (17) thoroughly.	Assembly cleaner	*BR00.45-Z-1028-04A
3	Remove cap.
4	Remove sieve from brake fluid reservoir (17).
5	Extract brake fluid from brake fluid reservoir (17).
6	Install sieve into brake fluid reservoir (17).
7	Attach cap.
8	Remove brake lines (7) from hydraulic unit.		AR42.40-P-0816MFA
9	Remove battery carrier (2) with firewall support (3).		AR54.10-P-0028MFA
10	Remove holders for power electronics.	Model 177, 247 with engine 282 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN))
			AR08.00-P-0005MFH
11	Remove engine compartment pre-fuse box (F150/3).		AR54.15-P-1330MFA
12	Release and disconnect electrical connector (11) from brake vacuum sensor (B150).
13	Cover painted surfaces in the repair area.	Protect painted surfaces from brake fluid. Otherwise damage will be caused by escaping brake fluid.
14	Clean master brake cylinder (12) in area of connections of brake lines (7).	Thoroughly clean area around connecting points before opening the brake system. Otherwise minute dirt particles in the hydraulic components result in malfunctions and 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.
		Assembly cleaner	*BR00.45-Z-1028-04A
15	Remove brake lines (7) from master brake cylinder (12).
	Note on calculation of tightening torque when using insertion or socket tools with various effective lengths		AH00.00-P-0015-01CW
		Seal connections immediately. Otherwise damage can be caused by escaping brake fluid.
		Collect escaping brake fluid.
		Retaining screw, brake line to master brake cylinder	*BA42.10-P-1002-04Q
		Box wrench bit	Fig 4
		Record plug	Fig 2
16	Move brake lines (7) far enough into holders so that the installation space of the brake booster (1) is free.	Do not deform brake lines (7). Otherwise failure can occur to the brake system.
17	Detach vacuum line (13) from brake booster (1).	Ensure that seal is correctly seated.
		Record plug	Fig 2
18	Check seal of vacuum line (13) in brake booster (1) for damage.	If damage is found, ↓ Replace seal of vacuum line (13) in brake booster (1).
19	Release and disconnect electrical connection (16).
20	Remove electric line from brake booster (1).	Dismantling tool	Fig 3
21	Remove lower trim for instrument panel on driver's side.		AR68.10-P-1501MFA
22	Unscrew screw (14).	Bolt, brake pedal brake booster retaining bolt	*BA43.10-P-1002-01L
23	Remove nuts (15).	Nut, brake booster to front end	*BA43.10-P-1001-01L
24	Remove brake booster (1) forward.	Do not damage boot when removing/installing brake booster (1). Otherwise the brake booster (1) will fail.
25	Remove master brake cylinder (12) with brake fluid reservoir (17) from brake booster (1).	When replacing brake booster (1).
			AR42.10-P-0300MFA
26	Remove brake vacuum sensor (B150) from brake booster (1).	When replacing brake booster (1).
27	Install in the reverse order.
	Check
28	Perform brake test on roller brake test stand.
	Brake test		AP42.00-P-4290BA

Fig 2: Identifying Record Plug (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Dismantling Tool (000 589 95 63 00)

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Fig 4: Identifying Box Wrench Bit (140 589 00 03 00)

Courtesy of MERCEDES-BENZ USA