Instruction/ maintenance manual of the product W211 Mercedes-Benz
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1 Sensotronic Brake Control (SBC) 327 HO 09 SBC (WJB) 03 - 05 - 04 R230 and W211: Starting MY2003.
2 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.
3 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.
4 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 As.
5 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 b.
6 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” t.
7 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 i.
8 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 • t.
9 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 .
10 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”, b.
11 Warning Display Complete ESP control module failure - Instrument cluster will scroll through failure displays.
12 Warning Display SBC control module failure Certain faults will trigger audible signal.
13 SBC Components • Brake Operating Unit (BOU) • Wheel speed sensors • Traction System Hydraulic Unit (A7/3).
14 W211 System Overview SBC control module (A7/3n1) Circuit 30 Circuit 87 Circuit 31 Wheel speed sensors L6/1, L6/2, L6/3, L6/4 Stop lamp switch (S9/1) SBC pedal travel sensor (B37/1) Rear SAM (N10/2).
15 R230 System Overview SBC control module (A7/3n1) Circuit 30 Circuit 87 Circuit 31 Wheel speed sensors L6/1, L6/2, L6/3, L6/4 Stop lamp switch (S9/1) SBC pedal travel sensor (B37/1) Diagnostic conne.
16 X11/4 Diagnosis Connection X11/4 Pin 9 Z6/33 R230 W211 A7/3n1 SBC N47/5 ESP N15/5 ESM N51/2 ABC X11/4 Pin 9 A7/3n1 SBC N47/5 ESP Z70/4 N10/1 L.F.SAM.
17 Brake Operating Unit - (BOU).
18 Brake Operating Unit The Brake Operating Unit (BOU) consists of the following: • Brake fluid reservoir (Do not overfill!) • SBC pedal value sensor • Tandem master cylinder • Brake pressure .
19 Master Cylinder • Fluid return line • Supply hose to SBC • Do not overfill • Fluid level sensor • Hydraulic lines to SBC.
20 Fluid Reservoir Cover • Ultraviolet protection (211 only).
21 Pedal Value Sensor - (B37/1) • Contains two hall effect sensors • Converts pedal travel value to an electrical signal • Provides input to SBC control module A7/3.
22 BOU Tandem Master Cylinder Fluid reservoir Floating piston Primary piston Brake pressure simulator Fill valves GF42.46 - P - 4200 - 03SL A7/3 y1 y2 A7/3 - Traction system hydraulic unit with separa.
23 Normal Braking - Light Pressure A7/3 y1 y2 GF42.46 - P - 4200 - 03SL • Driver applies pressure to the brake pedal • Pedal travel sensor sends a signal to A7/3 • Fill valves close • y1 and y.
24 Normal Braking - Increased Pressure A7/3 y1 y2 • Increasing pedal travel causes the larger spring to compress, providing harder pedal feel.
25 Normal Braking - Strongest Feedback A7/3 y1 y2 • Further pedal travel causes piston to compress rubber bumper, providing greatly increased pedal pressure.
26 Emergency Operation A7/3 y1 y2 Left front Right front GF42.46 - P - 4200 - 03SL GF42.46 - P - 3000SL • All electrical functions canceled • Hydraulic pressure created with NO power assist • Pressure directed through A7/3 y1 and y2 to .
27 Traction System Hydraulic Unit (A7/3) Consists of: • SBC control module (A7/3n1) • High pressure charge pump (A7/3m1) • Pressure reservoir.
28 Traction System Hydraulic Unit A7/3 GF42.50 - P - 4000 - 03S.
29 Legend 1 Brake Operating Unit 2 Brake pressure simulator 3 Pressure reservoir 7 Left front media separator (dividing piston) 8 Right front media separators (dividing piston) A7/3 Traction system hy.
30 Emergency Operation Circuit GF42.46 - P3000SL • Pressure applied directly to front calipers • y1 and y2 not energized • b1, b3, and b4 pressure sensors may provide information to SBC control .
31 Brake Pressure Supply GF 42.50 - P - 4000 - 04S GF42.46 - P - 0001SL • pressure reservoir charged to 160 bar • the high pressure charge pump runs as needed • pressure blocked by y6, y8, y10, .
32 Three Pressure Stages Same pressure stages as used with ABS functions: • Pressure apply • Pressure hold • Pressure release.
33 Pressure Apply - Rear Wheels GF42.50 - P - 4000 - 04S GF42.46 - P - 1000SL GF42.46 - P - 4500 - 02SL Reservoir pressure Brake pedal pressure • Brake pedal depressed • B37/1 and b1 report brake .
34 Pressure Apply - Front Wheels GF42.50 - P - 4000 - 04S GF42.46 - P - 1000SL Reservoir pressure Brake pedal pressure • y6 and y8 energized • pressure applied to left and right dividing pistons 7.
35 Pressure Apply - All Wheels GF42.50 - P - 4000 - 04S GF42.46 - P - 1000SL • Outlet control valves y7, y9, y11, y13 energized.
36 Pressure Hold - All Wheels GF42.50 - P - 4000 - 04S GF42.46 - P - 1000SL • y6, y8, y10, y12 de - energized.
37 Pressure Reduction - All Wheels GF42.50 - P - 4000 - 04S GF42.46 - P - 1000SL • y7, y9, y11, y13 de - energized.
38 Temperature Compensation During continuous brake use the fluid in the calipers expand, this: • creates high pressure • prevents valves 7 & 8 from moving To reduce this pressure, y1 and y2 a.
39 Deactivation Deactivating the system will: • empty the pressure reservoir (a lower pressure with no volume may be retained) • prevent the charge pump from operating • Note: the warning buzzer is deactivated when accessing SBC with the SDS. SBC must be deactivated with SDS before any work is performed on the system.
40 Deactivation SBC must be deactivated PRIOR to: • working on the hydraulic system • removing or installing brake pads • replacing rotors • replacing the pressure reservoir • replacing the .
41 Deactivation Charge pump disabled and accumulator fluid returned to the reser voir! Pressure at A7/3b2.
42 System Activation Activation must be performed anytime the system has been deactivated, BEFORE the engine is started! Failure to activate will prevent proper operation and create fau lt codes! Acti.
43 System Activation.
44 Activation - Left Front Caliper held with ~60 bar.
45 Activation - Right Front Caliper held with ~60 bar.
46 Activation - Right Rear Caliper held with ~60 bar.
47 Activation - Left Rear Caliper held with ~60 bar.
48 Activation - Recharge.
49 Bleeding the Brake System Proper system bleeding is critical! Follow directions in SDS • Bleeding must be performed using the SDS • Pressure at bleeder valves will exceed 100 bar (Hold the bleeder hose securely) • Bleeding may require ~1.5 hours • Bleeding may use ~ 1.
50 Equipment Required • Pressure bleeder • Adapters • Fluid receptacle • SDS - follow instructions carefully CAUTION: Extremely high pressure at bleeder! 211 589 01 91 00 AR42.
51 Bleeding the Brake System AR42.10 - P - 0012R Connect equipment and follow steps in SDS.
52 Acronym List (Used in This Handout.) ABS - Anti - lock Brake System ASR - Anti Slip Regulation BAS - Brake Assist System BOU - Brake Operating Unit CAN - Controller Area Network EBP - Electronic Br.
53 Appendix AR42.10 - P - 0010I Carrying out bleeding operation AR42.10 - P - 0012R Bleeding system with Star Diagnosis GF42.45 - P - 0001 - 04SL ESP driver information GF42.45 - P - 0001SL ESP function GF42.45 - P - 2000SL ESP brake moment co ntrol GF42.
An important point after buying a device Mercedes-Benz W211 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Mercedes-Benz W211 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Mercedes-Benz W211 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Mercedes-Benz W211 you will learn all the available features of the product, as well as information on its operation. The information that you get Mercedes-Benz W211 will certainly help you make a decision on the purchase.
If you already are a holder of Mercedes-Benz W211, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Mercedes-Benz W211.
However, one of the most important roles played by the user manual is to help in solving problems with Mercedes-Benz W211. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Mercedes-Benz W211 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
