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Home >> Mercedes Benz >> 2018 >> SLC43 AMG >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - Pneumatic System - 172 Chassis >> Testing & Repair >> Remove/Install Brake Booster - AR43.10-P-0350W

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

Model 172 

MODIFICATION NOTES

06.04.2017 Retaining screw, brake line to master brake cylinder   BA42.10-P-1003-04L
06.04.2017 Retaining screw, brake line to hydraulic unit   BA42.10-P-1004-04L

Shown on engine 276 

G13842203Courtesy of MERCEDES-BENZ USA
G13842204Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
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
  Notes on self-locking nuts and bolts   AH00.00-N-0001-01A
1 Eliminate vacuum in BAS brake booster (A7/7) IMPORTANT To do this, press the brake pedal several times with the engine switched off.  
2 Remove air/water duct (1)   AR83.25-P-1402V
3.1 Remove front engine cover Engine 276  
3.2
REFER TO MAINTENANCE
Remove air filter element Engine 271 AP09.10-P-0980CWT
4 Remove oil dipstick    
5 Loosen refrigerant line (4) and secure to one side IMPORTANT To do so, unscrew nut (3) and retaining clip (5).  
6 Detach vacuum line from check valve (10) In vehicles with radiator shutters  
7 Pull check valve (10) out of BAS brake booster (A7/7) INSTALLATION IMPORTANT Replace rubber seal on BAS brake booster (A7/7). AR43.10-P-0355W 
8 Suction off brake fluid from brake fluid expansion reservoir (2)    
9 Remove brake line (7) TORQUE SPECIFICATION Retaining screw, brake line to master brake cylinder *BA42.10-P-1003-04L 
    TORQUE SPECIFICATION Retaining screw, brake line to hydraulic unit *BA42.10-P-1004-04L 
10 Unscrew brake line (6) from master brake cylinder (8) TORQUE SPECIFICATION Retaining screw, brake line to master brake cylinder *BA42.10-P-1003-04L 
11 Detach feed hose for clutch master cylinder (arrow) from brake fluid expansion reservoir (2) Vehicles with manual transmission
IMPORTANT Seal feed hose.
SPECIAL TOOL Record plug
Fig 1
12 Disconnect electrical connector from brake fluid level switch (S11)    
13 Remove cap from fuse box (11)    
14 Remove left cover below dashboard    
15 Disconnect electrical connector (12) from brake lamp switch (S9/1)    
16 Unscrew safety screw (14) and remove brake pedal from clevis (13) INSTALLATION IMPORTANT The safety screw (14) must  be replaced.
TORQUE SPECIFICATION Brake booster to brake pedal
*BA43.10-P-1002-01J 
17 Unscrew nuts (15) from BAS brake booster (A7/7) TORQUE SPECIFICATION Nut, brake booster carrier to front end *BA43.10-P-1001-01J 
18 Release fuse box (11) and pull out of bulkhead ENGINE 152, 276 AR54.15-P-1256-01W
19 Take out BAS brake booster (A7/7) NOTES Do not deform brake line (6).
Otherwise, the brake line (6) must be replaced.
NOTES Do not damage boot (16) when removing and installing BAS brake booster (A7/7).
Otherwise the BAS brake booster (A7/7) must be replaced.
IMPORTANT Carefully push brake line (6) to one side when removing BAS brake booster (A7/7).
 
20 Remove master brake cylinder (8) When replacing the BAS brake booster (A7/7) AR42.10-P-0300CW
21 Install in the reverse order    
22
REFER TO MAINTENANCE
Carry out brake test on the test stand   AP42.00-P-4290BA
BRAKE LINES, BRAKE HOSES

Number Designation Model 172
BA42.10-P-1003-04L Retaining screw, brake line to master brake cylinder Ø4.75 Nm 16
Ø6 Nm 16
Ø8 Nm 16
BRAKE LINES, BRAKE HOSES

Number Designation Model 172
BA42.10-P-1004-04L Retaining screw, brake line to hydraulic unit Ø4 75 Nm 16
Ø6 Nm 16
Ø8 Nm 16
PNEUMATIC BRAKE BOOSTER

Number Designation Model 172
BA43.10-P-1001-01J Nut, brake booster carrier to front end Nm 22
PNEUMATIC BRAKE BOOSTER

Number Designation Model 172
BA43.10-P-1002-01J Brake booster to brake pedal Nm 22
Fig 1: Identifying Record Plug (129 589 00 91 00)
G12078802Courtesy of MERCEDES-BENZ USA