Sensotronic Brake Control (W211 SBC)


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Sensotronic Brake Control (W211 SBC)
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319 HO SBC (WJB) 9-30-02

These technical training materials are current as of the date noted on the materials, and may be revised or updated without notice. Always check for revised or updated information. To help avoid personal injury to you or others, and to avoid damage to the vehicle on which you are working, you must always refer to the latest Mercedes-Benz Technical Publication and follow all pertinent instructions when testing, diagnosing or making repair. Illustrations and descriptions in this training reference are based on preliminary information and may not correspond to the final US version vehicles. Refer to the official introduction manual and WIS when available. Copyright Mercedes-Benz USA, LLC, 2002
WIS document numbers shown apply to WIS Version G.05.05 05/02 USA/CDN
Reproduction by any means or by any information storage and retrieval system or translation in whole or part is not permitted without written authorization from Mercedes-Benz USA, LLC or it's successors. Published by Mercedes-Benz USA, LLC Printed in U. S.A.
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Index

Introduction

4

Advantages

5

Components

10

Overview

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X11/4

12

Warning Displays

13

Brake Operating Unit (BOU)

16

Pedal Value Sensor

19

Hydraulic Unit (A7/3)

26

Emergency Operation

29

Pressure Supply

30

Temperature Compensation

38

Wake up

39

Predrive Check (PDC)

40

Delayed Off

41

Deactivation

42

Activation

45

Warning Buzzer

52

Bleeding the System

54

Acronyms

57

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Evolution!
ABS (Anti lock Brakes 1984) + ASR (Automatic Slip Regulation 1991) + ETS (Electronic Traction System 1994) + ESP (Electronic Stability Program 1996) + BAS (Brake Assist System 1998) = SBC (Sensotronic Brake Control 2002)
SBC = Sensotronic Brake Control, the next level of brake control !
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GF42.45-P-0001SL

ABS Function
ABS - prevents the wheels from locking up during braking, maintaining steerability and directional control during deceleration
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GF42.45-P-0001SL

ASR, EBR and ESP Functions
ASR (braking moment) - prevents drive wheel from spinning while driving. EBR - reduces brake slip at the drive wheels during deceleration to ensure
directional control. ESP - prevents the vehicle from breaking away when oversteering or
understeering.
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GF42.45-P-0001SL

Advantages of SBC
• Improves metering of required brake pressure – each wheel can be precisely controlled
• Improved BAS function – monitors release of accelerator pedal – application of brake – maximum pressure available immediately – Pre-filling of system (overcoming play) – when the BAS function is anticipated (identified by the rapid release of the gas pedal), slight pressure is applied

GF42.46-P-0001SL

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GF42.46-P-2000SL

Advantages of SBC
• Optimal brake force distribution front to rear and side to side (EBP) – allows brake proportioning front to back and side to side
• No pedal vibration during ABS operation – eliminates “distraction” to the driver during critical moments – indicator light in instrument cluster signals traction loss
• Improved driving dynamics: ABS, ASR, and ESP – faster response to brake request inputs

GF42.46-P-0001SL

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GF42.46-P-2000SL

Advantages of SBC
• Pressure reduction at standstill – reduces stress on components
• Dry braking function • wiper input via CAN • ~every 7 to 14 minutes • brake actuation changes time interval

GF42.46-P-0001SL

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GF42.46-P-2000SL

SBC Components
• Brake Operating Unit (BOU) • Wheel speed sensors • Traction System Hydraulic Unit A7/3
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Sensotronic Brake Control (W211 SBC)