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Home >> Mercedes Benz >> 2017 >> GLS350d >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Hydraulic & Mechanical System - 166 Chassis 1 Of 2 >> Testing & Repair >> Remove/Install Stepped Tandem Master Brake Cylinder - AR42.10-P-0310GZ

Remove/Install Stepped Tandem Master Brake Cylinder - AR42.10-P-0310GZ

Model 164, 166, 292 

Shown on model 164 

Fig 1: Stepped Tandem Master Brake Cylinder Components Location - Model 166 (Shown On Model 164)
G14138775Courtesy of MERCEDES-BENZ USA

Shown on model 164 

G14138776Courtesy of MERCEDES-BENZ USA
CAUTION 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 
Notes on externally invisible brake fluid loss   AH42.10-P-9406-02A 
Brake fluid notes   AH42.50-P-0001-01A 
Notes on repairs to brake system   AH42.00-P-0003-01A 
REMOVINGINSTALLING Remove/install     
1 Switch off ignition and store transmitter key outside of transmission range (min. 2 m)    
2 Push down brake pedal several times IMPORTANT In order to reduce the vacuum in the BAS brake booster.  
3 Open hood Model 164 AR88.40-P-1000GZ
    Model 166 AR88.40-P-1000GQ
4 Detach rubber seal (1) in the left section area of the partition wall (4) Model 164  
5 Unscrew bolt (2) Model 164  
6.1 Detach left section of partition wall (4) from retaining clips (3) Model 164  
6.2 Remove cover over left suspension strut tower Model 166, 292  
7 Release and disconnect the electrical connector (5) from the brake fluid indicator switch    
CLEAN Clean     
8 Clean area surrounding brake line connections on master brake cylinder (10) NOTES Before opening the brake system, the area around the separating point must be cleaned thoroughly.
Even the smallest dirt particles, introduced into the hydraulic components, can lead to malfunctions and a total failure of the brake system.
 
9 Mark brake line (6) relative to the connection on master brake cylinder (10) Model 164  
    IMPORTANT To prevent a mix-up when installing.  
10 Detach brake lines (6) from master brake cylinder (10) TORQUE SPECIFICATION Brake pipe to master brake cylinder *BA42.10-P-1003-04J 
    SPECIAL TOOL Box wrench bit Fig 2
11 Collect escaping brake fluid using rags and seal exposed connections NOTES Seal connections immediately.
Otherwise, escaping brake fluid may damage adjacent components.
SPECIAL TOOL Record plug
Fig 3
12 Unscrew nuts (7) TORQUE SPECIFICATION Nut, brake master cylinder to brake booster *BA42.10-P-1001-05H 
INSPECT Check     
13 Check master brake cylinder (10) for leakage at rear primary piston If a problem arises

Replace master brake cylinder (10)
 
14 Pull brake master cylinder (10) off threaded studs and turn slightly to the side. NOTES Do not tilt master brake cylinder (10), instead pull it out straight forwards.
Otherwise, the push rod can be pushed out of its axial position and broken out of the retaining lugs on the controller.
 
15 Disconnect electrical connector (8) from ESP®/BAS brake pressure sensor (17) Model 164  
16 Remove master brake cylinder (10) INSTALLATION IMPORTANT The O-ring (16) must be replaced.  
17 Remove screw (12) TORQUE SPECIFICATION Screw/bolt, brake fluid reservoir to master brake cylinder *BA42.10-P-1003-05H 
18 Pull brake fluid reservoir (11) out of master brake cylinder (10)    
INSPECT Check     
19 Check condition of seals (15) If a problem arises

Replace seals (15)
 
20 Remove bolts (13) Model 164
TORQUE SPECIFICATION Screw/bolt, impact deflector plate to master brake cylinder
*BA42.10-P-1002-05H 
21 Remove impact deflector plate (14) Model 164  
22 Remove ESP®/BAS brake pressure sensor (17) Model 164  
    TORQUE SPECIFICATION Brake pressure sensor to master brake cylinder *BA42.45-P-1001-01J 
23 Use water to rinse off any escaped brake fluid    
24 Install in the reverse order    
25 Bleed brake system Model 164 AR42.10-P-0010GZ
    Model 166, 292 AR42.10-P-0010CW 
INSPECT Check     
26 Check brake system for leaks   AR42.10-P-0100-01GZ 
27 Carry out brake test on the test stand    
REFER TO MAINTENANCE     AP42.00-P-4290BA
MASTER BRAKE CYLINDER

Number Designation Model 164.1/8 Model 166
BA42.10-P-1001-05H Nut, brake master cylinder to brake booster Nm 10 23
MASTER BRAKE CYLINDER

Number Designation Model 292
BA42.10-P-1001-05H Nut, brake master cylinder to brake booster Nm 23
MASTER BRAKE CYLINDER

Number Designation Model 164.1/8
BA42.10-P-1002-05H Screw/bolt, impact deflector plate to master brake cylinder Nm 14
BRAKE LINES, BRAKE HOSES

Number Designation Model 164.1/8 Model 166
BA42.10-P-1003-04J Brake pipe to master brake cylinder Nm 18 18
BRAKE LINES, BRAKE HOSES

Number Designation Model 292
BA42.10-P-1003-04J Brake pipe to master brake cylinder Nm 16
MASTER BRAKE CYLINDER

Number Designation Model 164.1/8 Model 166
BA42.10-P-1003-05H Screw/bolt, brake fluid reservoir to master brake cylinder Nm 4 4
MASTER BRAKE CYLINDER

Number Designation Model 292
BA42.10-P-1003-05H Screw/bolt, brake fluid reservoir to master brake cylinder Nm 8
ELECTRONIC STABILITY PROGRAM (ESP)

Number Designation Model 164.1/8
BA42.45-P-1001-01J Brake pressure sensor to master brake cylinder Nm 35
Fig 2: Identifying Box Wrench Bit (140 589 00 03 00)
G07449671Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Record Plug (129 589 00 91 00)
G07473018Courtesy of MERCEDES-BENZ USA