Diagnstic Scanner And Sensotronic Brake Control

Mercedes Benz Sensotronic Brake Control (SBC) is an electro-hydraulic brake system.In normal operation the hydraulic link between brake pedal and wheel brakes is interrupted by separation valves.
In contrast to a conventional brake system, an electro-hydraulic control is thus actuated for each type of brake application.
· Improves metering of the necessary braking pressure more exactly and rapidly.· Shortens the stopping distance particularly during emergency brake applications (improved BAS function).
· Enhances the active vehicle dynamic safety as the vehicle dynamic control systems ABS and BAS as well as ASR and ESP can be applied more optimized.
· Leads to a timely and comfortable stabilization of the vehicle during ASR or ESP controls.
· Takes care of more uniform wear on the brake pads and improves response characteristics of the brakes as a result of optimal braking force distribution between front and rear wheels. In the partial braking range and when braking from a low speed, the braking force reserve of the rear wheels is used by enlarging the braking force portion.
· Results in more stable braking performance with optimal deceleration values when cornering as a result of the braking forces being shifted to the outer wheels.
· No reaction (vibration) at brake pedal during control cycles of the ABS.
1. SBC Hold
2. SBC Stop
3. Soft stop
Offers safety-relevant additional functions such as:
1. Dry braking of the brake disks under wet conditions
2. Pre-charging (overcoming play)
The system is operational as soon as it is "woken" i.e. as soon as signals from the door contact switches, the trunk switch, the stop lamp switch, or the remote control indicate that the driver may possibly apply the brakes.
In order to prevent the system switching off when the vehicle is rolling (e.g. rolling downhill or traffic jam situation) with the ignition switched off, in addition a signal is transmitted which displays the vehicle standstill.
After "waking" the SBC carries out the self-test (Pre-Drive Check). What is checked is the reservoir pressure and this is corrected, if necessary. In addition, the pressure sensors and the control valves are checked and various leak and operational checks performed. Constant and alternating self-tests are also carried out while driving.
Note:Pressure is built up in the brake system during the Pre-Drive Check, in order to prevent the pistons in the brake calipers moving out unintentionally (e.g. when changing the brake pads), the system must be deactivated using the diagnosis tool when working on the brake system.
The actuation of the brake by the driver is conveyed electronically to the SBC control units via two pedal value sensors. The brake pressures calculated are metered individually to the individual wheel brakes by the SBC hydraulic units. The hydraulic energy required for this is supplied by two high pressure reservoirs which are each supplied with pressure by a high-pressure charging pump.
If faults exist in the electro-hydraulic system, the hydraulic link between brake pedal and wheel is automatically restored.
The Sensotronic Brake Control (SBC) contains the following system relationships:
The ESP control unit takes priority over the SBC control units.
The three control units are interlinked by their own CAN data bus.
The SBC control units convey data on the braking of the driver requirement and on the pressures in the system to the ESP control unit. There, the specified pressures required are calculated and transmitted to the SBC control units. In the SBC control units the pressures for the braking control are then set and the actual pressures signaled back.
· A7/3 SBC left hydraulic unit
· n1 SBC left control module
· A7/4 SBC right hydraulic unit
· n1 SBC right control module
· B37/1 SBC pedal value sensor 1
· B37/2 SBC pedal value sensor 2
· L6/1 Left front rpm sensor
· L6/2 Right front rpm sensor
· L6/3 Left rear rpm sensor
· L6/4 Right rear rpm sensor
· S9/1 Stop lamp switch
· X11/4 Diagnostic data link connector
· Operating unit
· 5a1 Right front brake caliper, front
· 5a2 Right front brake caliper, rear
· 5b1 Left front brake caliper, front
· 5b2 Left front brake caliper, rear
· 6a Brake caliper, right rear
· 6b Brake caliper, rear left
· A7/3 SBC left hydraulic unit
· A7/4 SBC right hydraulic unit
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