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Risk of injury
caused by body parts being jammed or crushed. Risk of injury
to skin and eyes caused by brake fluid spraying out at high pressure when working on the SBC brake system |
Deactivate SBC brake system using STAR DIAGNOSIS. |
AS42.46-Z-0001-01A |
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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 |
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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 |
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Notes on repairs to brake system |
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AH42.00-P-0003-01A |
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Brake fluid notes |
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AH42.50-P-0001-01A |
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Notes on self-locking nuts and bolts |
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AH00.00-N-0001-01A |
| 1 |
Unscrew the cap on the brake fluid expansion reservoir and suction off some brake fluid |
In order to prevent the expansion reservoir overflowing when pressing back the brake pistons. |
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*BA42.50-P-1001-01D |
| 2 |
Deactivate SBC brake system using STAR DIAGNOSIS. |
Vehicles with Sensotronic Brake Control (SBC) |
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The following steps should be run through in STAR DIAGNOSIS: |
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Select menu item "SBC-Sensotronic Brake Control"/"Deactivate 'SBC' system". |
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Then process all the individual steps from top to bottom. |
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| 3 |
Remove rear wheels. |
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Remove/install wheels, rotate if necessary |
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AP40.10-P-4050Z |
| 4 |
Remove brake pad contact sensor (S10/4) |
Installation:
Replace defective contact sensor (S10/4). |
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Notes on installing brake pad wear sensor contact sensors |
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AH42.10-P-0003-01A |
| 5 |
Detach brake pad contact sensor connector (S10/4x1) from fixed brake caliper (31) |
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*BA42.10-P-1002-12H |
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*BA42.10-P-1002-12B |
| 6 |
Drive out retaining pins (41) using punch and remove retaining spring (31d) |
Installation:
Knock retaining pins (41) all the way in. Ensure that retaining spring (31d) is correctly seated. |
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| 7 |
Pull brake pads (31g) out of fixed brake caliper (31) |
In order to prevent damage when pressing out the brake pads (31g) insert wedge between the 
lever and fixed brake caliper (31)
. |
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Brake pads (31g) are to be disposed of as special waste. The local authorities can provide information regarding whether disposal is also permitted as industrial waste similar to domestic waste. |
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Installation:
Only the brake pads (31g) approved by Mercedes-Benz may be built-in as a set. Install brake pads (31g) with
retaining spring (31d) ungreased. The marking on the retaining spring (31d) must point in the direction of rotation of the wheel when driving forwards. |
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Figure |
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Figure |
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Checking |
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| 8 |
Check brake lining thickness and brake disks |
Only replace brake pads (31g) and brake disks in complete sets if necessary. |
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Check brake lining thickness |
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AP42.10-P-4253A |
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Inspect condition of brake disks |
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AP42.10-P-4258R |
| 9 |
Check fixed caliper (31) for leaktightness and dust boots of brake pistons for damage and correct seating |
If the fixed brake caliper (31) is leaking or the dust boot is damaged or incorrectly seated: ↓ |
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Install new fixed brake caliper (31). |
AR42.10-P-0080RA |
| 10 |
Press back brake piston using pusher tool |
In each case secure an opposed pair of brake pistons beforehand with wedges to prevent l them from being pressed out. If the brake pads (31g) of several brake calipers are removed, also secure their brake pistons to prevent them from falling out. |
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Do not fit pusher tool on the brake disk but push back the opposite brake pistons simultaneously. If brake pistons are sluggish: ↓ |
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Install new fixed brake caliper (31). |
AR42.10-P-0080RA |
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Figure |
| 11 |
Install in the reverse order |
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Clean |
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| 12 |
If necessary, clean the perforation of brake disks |
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AR42.10-P-2260-01I |
| 13 |
Clean contact surfaces of brake pads (31g) |
Do not use any sharp-edged or pointed tools to prevent damage. |
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| 14.1 |
Activate SBC brake system using STAR DIAGNOSIS |
Vehicles with Sensotronic Brake Control (SBC) |
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The following steps should be run through in STAR DIAGNOSIS: |
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Select the menu item "SBC-Sensotronic Brake Control"/"Initial startup after repair"/"Remove/install brake pads". |
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Then process all the individual steps from top to bottom. |
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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 engine, actuate brake pedal several times until the pressure is built up and maintained in the brake system. |
AS42.50-Z-0002-01A |
| 14.2 |
Operate the brake pedal several times until the brake pads (31g) contact the brake disks |
Vehicles with Adaptive Brake (ABR) |
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Firm resistance should be noticeable at the brake pedal. |
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| 15 |
Inspect fluid level in expansion reservoir, adjust to correct level if necessary |
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Brake system - inspect fluid level |
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AP42.10-P-4210Z |