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Home >> Mercedes Benz >> 2007 >> SLK280 Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - 171 Chassis >> Testing & Repair >> Remove/install stepped tandem brake master cylinder - AR42.10-P-0310V

Remove/install stepped tandem brake master cylinder - AR42.10-P-0310V

MODELS 171.442 /454 /456 /473 

Fig 1: Identifying Stepped Tandem Brake Master Cylinder Components
G05027614Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install    
DANGER 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. -
NOTES Brake fluid notes   AH42.50-P-0001-01A 
NOTES Notes on repairs to brake system   AH42.00-P-0003-01A 
NOTES Notes on externally invisible brake fluid loss   AH42.10-P-9406-02V 
1 Reduce vacuum in BAS brake booster (A7/7) IMPORTANT To do this, press the brake pedal several times with the engine switched off.  
2 Open engine hood and raise to vertical position   AR88.40-P-1000V
3 Disconnect the electrical connector (20) from the brake fluid indicator switch (S11)    
4 Suction off brake fluid from the brake fluid expansion reservoir (10)    
5 Detach brake lines (6) from tandem master brake cylinder (1) IMPORTANTSPECIAL TOOL Seal off line connections using plugs.  
    TORQUE SPECIFICATION *BA42.10-P-1003-04A 
    SPECIAL TOOL Ring wrench socket Figure
    SPECIAL TOOL Set of stop plugs Figure
6 Disconnect the electrical connector from the ESP brake pressure sensor 1 (B34/1)    
7.1 Unscrew ESP brake pressure sensor 1 (B34/1) If the tandem master brake cylinder (1) is replaced. AR42.45-P-0816V 
    TORQUE SPECIFICATION *BA42.45-P-1007-01B 
8 Unscrew the pendulum support IMPORTANT On vehicles which have been involved in accidents with deformations in the front end area the pendulum support must be checked for unobstructed movement. AR42.10-P-0300-02V 
9.1 Detach feed hose (7) from clutch master cylinder Models with manual transmission
IMPORTANT Seal feed hose (7) with SPECIAL TOOL stop plugs.
AR25.20-P-0100-01V
    SPECIAL TOOL Set of stop plugs Figure
10 Unscrew nuts (19) on the top and bottom of the BAS brake booster (A7/7) TORQUE SPECIFICATION *BA42.10-P-1001-05A 
11 Pull tandem master brake cylinder (1) off threaded studs and turn to the side NOTES Do not tilt tandem master brake cylinder (1) but pull out forwards in a straight line otherwise the thrust rod will be pressed out of its axial position and may break out of the retaining lugs on the master control unit.  
12 Remove tandem master brake cylinder (1) IMPORTANTInstallation:  Replace gasket (17).  
13 Unscrew bolt (10a)    
14 Pull the expansion reservoir (10) for brake fluid out of the tandem master brake cylinder (1) NOTESInstallation:  Check reservoir plugs (9) and replace if necessary.  
15 Install in the reverse order    
16 Bleed brake system   AR42.10-P-0010V 
    FLUID SPECIFICATION Brake fluid *BF42.10-P-1001-01A 
INSPECT Check     
DANGER Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near engine Secure vehicle to prevent it from moving.
Wear closed and snug-fitting work clothes.
Do not grasp hot or rotating parts.
-
17 Check brake system for leaks   -
DANGER Risk of death  caused by body parts being pulled in by rotating vehicle wheels and roller dynamometer rollers Do not insert your hand into rotating parts.
Wear closed and snug-fitting work clothes.
Safeguard areas with rotating vehicle parts and dynamometer rollers against unauthorized access.
Safeguard roller dynamometer from unauthorized access.
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18 Perform a function test    
REFER TO MAINTENANCE Brake testing on test stand   AP42.00-P-4290V 
BRAKE LINES, BRAKE HOSES

Number Designation Model 171
BA42.10-P-1003-04A Brake pipe to master brake cylinder Nm 16
ELECTRONIC STABILITY PROGRAM (ESP)

Number Designation Model 171
BA42.45-P-1007-01B Brake pressure sensor to master brake cylinder Nm 25
BRAKE MASTER CYLINDER

Number Designation Model 171
BA42.10-P-1001-05A Nut, brake master cylinder to brake booster Nm 25
BRAKE FLUID

Number Designation Model 171
BF42.10-P-1001-01A Brake fluid Filling capacity Liters ≈ 0.45...0.6
Specifications for Operating Fluids Sheet BB00.40-P-0330-01A
Sheet BB00.40-P-0331-00A
Fig 2: Identifying Ring Wrench Socket (000 589 75 03 00)
G05027615Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Set Of Plugs (129 589 00 91 00)
G05027616Courtesy of MERCEDES-BENZ USA