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Home >> Mercedes Benz >> 2007 >> S550 Base >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes -- Testing & Repair -- S-Class (221) >> Testing & Repair >> Test brake system with pressure tester for leaks - AR42.10-P-0015SX

Test brake system with pressure tester for leaks - AR42.10-P-0015SX

MODEL 216 

MODEL 221 

Fig 1: Testing Brake System For Leaks
G07593494Courtesy of MERCEDES-BENZ USA
MODIFICATION NOTES

29.7.09 Value changed: bleed screw to brake caliper *BA42.10-P-1001-10M
INSPECT Checking     
DANGER Risk of poisoning  caused by swallowing brake fluid. Risk of injury  caused by brake fluid coming into contact with skin and eyes. 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
DANGER Risk of injury  to skin and eyes caused by handling hot or glowing objects. Wear safety gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
NOTES Brake fluid notes   AH42.50-P-0001-01A
NOTES Notes on externally invisible brake fluid loss   AH42.10-P-9406-02V
NOTES Notes on repairs to brake system   AH42.00-P-0003-01A
1 Deactivate easy entry/exit Vehicles with memory package (driver seat, steering column, mirrors) code 275 AR54.30-P-1000-02ESX
2 Connect brake fluid changing unit to expansion reservoir (1) IMPORTANT Observe manufacturer's operating instructions!  
3 Detach left front wheel Vehicles with engine 275 and engine 629 with top protection, code Z07  
REFER TO MAINTENANCE Remove/install wheels   AP40.10-P-4050SX
4 Remove the bleed screw on the left front brake caliper (2) and connect pressure tester (3) NOTES Pressure testers (3) for hydraulic oil systems must not be used for systems with brake fluid otherwise the brake fluid is mixed with mineral oil which can lead to brake failure!
NOTES Observe manufacturer's operating instructions in order to prevent measurement errors or incorrect operation!
 
5 Bleed pressure tester (3)    
6 Switch off brake fluid changing unit and release pressure    
HIGH PRESSURE TEST High-pressure 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 the engine as it is running Secure vehicle to prevent it from moving by itself.
Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.
AS00.00-Z-0005-01A
7 Allow the engine to run at moderate speed and release the accelerator pedal suddenly IMPORTANT To create the strongest possible vacuum in the BAS brake booster (A7/7).  
8 Immediately press down brake pedal as far as possible and SPECIAL TOOL insert brake pedal jack (010) with SPECIAL TOOL adapter between brake pedal and seat NOTES Protect brake pedal and seat against damage.
SPECIAL TOOL
Fig 3
    SPECIAL TOOL Fig 2
9 Read off and note brake pressure on high-pressure gauge of pressure tester (3)    
10 Read off and note brake pressure again after 5 minutes on the high-pressure gauge of the pressure tester (3) IMPORTANT During the 5 min duration of the test, the brake pressure may not drop more than 5 %.  
HIGH PRESSURE TEST Low-pressure testing     
11 Switch off engine and remove SPECIAL TOOL brake pedal jack (010) with SPECIAL TOOL adapter    
12 Push down brake pedal several times IMPORTANT In order to reduce the vacuum in the BAS brake booster (A7/7).  
13 Press down brake pedal as far as possible and insert SPECIAL TOOL brake pedal jack (010) with SPECIAL TOOL adapter between brake pedal and seat NOTES Protect brake pedal and seat against damage.  
14 SPECIAL TOOL Move back the brake pedal jack (010) slowly until a brake pressure of approx. 3 bar is displayed on the low pressure gauge of the pressure tester (3)    
15 Read off and note the brake pressure after 2 minutes on the low pressure gauge of the pressure tester (3) IMPORTANT The brake pressure must not drop during the 2 min duration of the test.  
16 SPECIAL TOOL Remove brake pedal jack (010) and SPECIAL TOOL adapter    
17 Detach pressure tester (3) and screw bleed screw into brake caliper (2) TORQUE SPECIFICATION Brake caliper *BA42.10-P-1001-10M
18 Bleed brake system   AR42.10-P-0010-02SX 
19 Mount left front wheel Vehicles with engine 275 and engine 629 with top protection, code Z07  
REFER TO MAINTENANCE Remove/install wheels   AP40.10-P-4050SX
20 Detach brake fluid changing unit    
21 Correct fluid level in expansion reservoir (1)    
REFER TO MAINTENANCE Brake system - inspect fluid level   AP42.10-P-4210SX
FRONT AXLE BRAKE CALIPER

Number Designation Model 216 except model 216.374/377/379 Model 221 except model 221.074/077/174 /177/179
BA42.10-P-1001-10M Bleed screw to brake caliper Nm 14 14
Fig 2: Identifying Brake Pedal Jack (000 589 18 31 00)
G07593495Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Adapter For Brake Pedal Jack (211 589 00 31 00)
G07593496Courtesy of MERCEDES-BENZ USA