Remove/Install Master Brake Cylinder - AR42.10-P-0300MFA

Model 118, 177, 247

MODIFICATION NOTES

15.01.2020

Document completely revised.

Courtesy of MERCEDES-BENZ USA

Shown on model 177.0 with engine 282 except code ME08 (Hybrid drive 755-84 KW VARIANT (INCLUDING PLUG-IN))

Fig 1: Master Brake Cylinder Components Location - Model 247 (Shown On Model 177.0 With Engine 282 With Code ME08)

Courtesy of MERCEDES-BENZ USA

Shown on model 177.0 with engine 282 with code ME08 (Hybrid drive 75-84 KW VARIANT (INCLUDING PLUG-IN))

	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 PLUG-IN))	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 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
Topical note	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 PLUG-IN))	AH00.00-Z-0300-01A
Topical note	Notes on repairs to brake system		AH42.00-P-0003-01A
Topical note	Brake fluid notes		AH42.50-P-0001-01A
	Notes on safety-relevant components		AH00.00-Z-0019-01A
	Remove
1	Reduce vacuum in brake booster by depressing brake pedal several times.
2	Remove battery carrier.		AR54.10-P-0028MFA
3.1	Remove holders for power electronics.	Model 177, 247 with engine 282 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUG-IN))
			AR08.00-P-0005MFH
3.2	Remove heat shield for firewall until the master brake cylinder (6) is accessible.	Model 118 with engine 282 Model 118, 177, 247 with engine 139 Model 118, 177, 247 with engine 260 Model 118, 177, 247 with engine 608 Model 118, 177, 247 with engine 654 Model 177, 247 with engine 282 except code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUG-IN))
		Model 118, 177, 247 with engine 260	AR49.10-P-0001MFC
		Model 118 with engine 282 Model 177, 247 with engine 282 except code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUG-IN))	AR49.10-P-0001MFD
		Model 118, 177, 247 with engine 608	AR49.10-P-0001MFE
		Model 118, 177, 247 with engine 654	AR49.10-P-0001MFF
		Model 118, 177, 247 with engine 139	AR49.10-P-0001MFG
4	Extract brake fluid from brake fluid reservoir (1).
5	Release and disconnect electrical connector (7).
6	Unclip electric line (4) from master brake cylinder (6).	Clip remover	Fig 5
7	Mark brake lines (2) relative to master brake cylinder (6).
8	Remove brake lines (2) from master brake cylinder (6).	Collect brake fluid which runs out with an absorbent rag. The paint will be damaged otherwise.
		Box wrench bit	Fig 4
		Adapter coupling	Fig 2
9	Seal exposed connections using suitable plugs.	Record plug	Fig 3
10	Unclip brake lines (2) from bracket and press lightly to one side.	Do not kink or crush brake lines (2). Otherwise damage will occur.
11	Remove nuts (5).
12	Remove master brake cylinder (6) with brake fluid reservoir (1).
13	Detach brake fluid reservoir (1) from master brake cylinder (6).	When replacing the master brake cylinder (6).
			AR42.10-P-0308MFA
	Install
14	Attach brake fluid reservoir (1) to master brake cylinder (6).	When replacing the master brake cylinder (6).
			AR42.10-P-0308MFA
15	Position master brake cylinder (6) with brake fluid reservoir (1) on brake booster.
16	Install nuts (5).	Nut, master brake cylinder to brake unit	*BA42.10-P-1001-05G
17	Remove stop plugs from connections.	Record plug	Fig 3
18	Clip brake lines (2) into holder and position on master brake cylinder (6).	Observe markings.
19	Attach brake lines (2) to master brake cylinder (6).
	Note on calculation of tightening torque when using insertion or socket tools with various effective lengths		AH00.00-P-0015-01CW
		Retaining screw, brake line to master brake cylinder	*BA42.10-P-1002-04Q
		Box wrench bit	Fig 4
		Adapter coupling	Fig 2
20	Clip electric line (4) onto master brake cylinder (6).
21	Connect and lock electrical connector (7).
22.1	Attach heat shield for firewall.	Model 118 with engine 282 Model 118, 177, 247 with engine 139 Model 118, 177, 247 with engine 260 Model 118, 177, 247 with engine 608 Model 118, 177, 247 with engine 654 Model 177, 247 with engine 282 except code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUG-IN))
		Model 118, 177, 247 with engine 260	AR49.10-P-0001MFC
		Model 118 with engine 282 Model 177, 247 with engine 282 except code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUG-IN))	AR49.10-P-0001MFD
		Model 118, 177, 247 with engine 608	AR49.10-P-0001MFE
		Model 118, 177, 247 with engine 654	AR49.10-P-0001MFF
		Model 118, 177, 247 with engine 139	AR49.10-P-0001MFG
22.2	Install holders of power electronics.	Model 177, 247 with engine 282 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUG-IN))
			AR08.00-P-0005MFH
23	Install battery carrier.		AR54.10-P-0028MFA
24	Bleed brake system.		AR42.10-P-0010MFA
	Check
25	Perform brake test on test stand.
			AP42.00-P-4290BA