Mercedes-Benz R230, W211 User Manual

4 (2)
Mercedes-Benz R230, W211 User Manual

Sensotronic Brake Control

(SBC)

1

R230 and W211: Starting MY2003

327 HO 09 SBC (WJB) 03-05-04

Objectives

At the end of this presentation, you should be able to:

1.Explain the function of and purpose for SBC

2.Describe the customer interface with SBC

3.List the hydraulic and electronic components used for SBC

4.Describe how the “normal” feel of the brake pedal is maintained

5.Explain emergency operation of the SBC braking system

6.Describe “temperature compensation”

7.Explain “Deactivation” and describe when it is necessary to do it

8.“Activate” the SBC system

9.Locate tools and the proper procedure for bleeding brakes

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 ref er 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, 2004 2

WIS document numbers shown apply to WIS Version USA/CDN at date of writing.

 

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.

Contents

Advantages of SBC

5

Driving with SBC

8

SBC components

13

Brake operating unit (BOU)

17

Traction system hydraulic unit

27

Three pressure stages

32

Temperature Compensation

38

Deactivation

39

System activation

42

Bleeding the system

49

3

SBC Incorporates these Functions:

ABS (Anti lock Brakes 1984)

+ASR (Automatic Slip Regulation 1991)

+ETS (Electronic Traction System 1995)

+ESP (Electronic Stability Program 1996)

+BAS (Brake Assist System 1998)

4

Advantages of SBC

Improves metering of required brake pressure

each wheel can be precisely controlled

Improved BAS function

monitors release of accelerator pedal and application of brake

maximum pressure available immediately

pre-filling of system (overcoming play)

when the BAS function is anticipated, slight pressure is applied

5

Advantages of SBC

Electronic Brake Proportioning: 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

6

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

7

Driving with SBC - Wake-Up

SBC is functional as soon as it is “wakened” by:

opening a door (via CAN)

operating the central locking system (via CAN)

depressing the brake pedal

turning key to position 1

operating parking brake

•The Wake-Up may be followed by a Pre-Drive self

 

Check performed by SBC

8

Driving with SBC – Pre-Drive Check (PDC)

When SBC performs a PDC after a "wake-up", the following are checked:

Warning! Pressure is applied to brake calipers (~60 bar)

reservoir pressure (if low, it will be corrected by running the high pressure charge pump in the hydraulic unit)

pressure sensors

control valves

leak tests

operational checks

Note: self-tests are constantly conducted during driving (~ once every 16

brake applications)

9

 

Driving with SBC – Delayed Off Function

Time that SBC remains operational after use:

with vehicle stationary and was locked = 20 seconds

with vehicle stationary and ignition in “0”,

brake pedal not operated = 2 minutes

• with vehicle stationary, ignition in “0”,

brake pedal operated in delayed off phase and released again = 4 minutes

10

Warning Display

Complete ESP control module failure -

Instrument cluster will scroll through failure displays

11

Warning Display

SBC control module failure

Certain faults will trigger audible signal

12

SBC Components

Brake Operating Unit (BOU)

Wheel speed sensors

Traction System Hydraulic Unit (A7/3)

13

W211 System Overview

Circuit 30

 

Brake lights

Rear SAM

Circuit 87

 

 

(N10/2)

 

SBC

 

 

 

 

Circuit 31

SBC

CAN

ESP control

Wheel speed sensors

control

Wheel

module (N47/5)

module

speeds

 

 

 

L6/1, L6/2, L6/3, L6/4

(A7/3n1)

Wake up

 

 

 

Front

Stop lamp switch

 

Brake lights

 

Speed status

SAM

(S9/1)

 

Diagnostics

(N10/1)

SBC pedal travel

 

Diagnostic connector

sensor (B37/1)

 

 

 

(X11/4)

 

 

 

14

R230 System Overview

Circuit 30

 

Brake lights

Rear SAM

 

 

(N10/8)

Circuit 87

 

 

 

 

 

Circuit 31

SBC

Diagnostic connector

 

(X11/4)

 

control

 

Wheel speed sensors

 

 

module

SBC

 

L6/1, L6/2, L6/3, L6/4

(A7/3n1)

CAN

ESP control

 

Stop lamp switch

 

Wheel

module (N47/5)

 

speeds

 

(S9/1)

 

 

 

SBC pedal travel

 

Wake up

Passenger side

 

Brake lights

sensor (B37/1)

 

Speed status

SAM (N10/11)

15

X11/4 Diagnosis Connection

R230

 

W211

A7/3n1

 

A7/3n1

 

SBC

SBC

 

 

 

N47/5

 

X11/4

ESP

 

N10/1

 

 

 

X11/4

L.F.SAM

 

Z70/4

 

 

N15/5

 

Pin 9

ESM

 

 

Z6/33

 

 

 

Pin 9

N47/5

N51/2

 

 

ESP

ABC

 

 

 

16

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