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PB-06107 Revised 06/09

Hydraulic Power Brake (HPB) Catalog

PageAccumulator……………………………………………………………4Diagnostic and Test Equipment………………………………………10Electronic Control Unit (ECU)…………………………………………4HCU Accessories………………………………………………………6HCU Reservior………………………………………………………… 4Hydraulic Compact Unit (HCU) Assembly……………………………2Hydraulic Pump…………………………………………………………6Information Cross Reference………………………………………… 10Master Cylinder Assembly……………………………………………7Master Cylinder Travel Switch…………………………………………8Numerical Parts Listing……………………………………………… 11Parking Brake Switch…………………………………………………5Pressure Supply Valve…………………………………………………4Relay Valves……………………………………………………………5Right Angle (90°) Sensors…………………………………………… 9Sensor Clips……………………………………………………………9Sensor Extension Cables………………………………………………9Straight Sensors……………………………………………………… 9Tooth Wheels……………………………………………………………10

ECU and reservoir may be purchased individually. Mounting bracket is not included with the replacement assembly. Please see maintenance manual MM-0401 for service details.

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HYDRAULIC COMPACT UNIT (HCU) ASSEMBLY

HCU REPLACEMENT KIT

PART NO. SERVICE EXCHANGE

PART NO. APPLICATION INFORMATION S400 850 875 0 S400 850 875 7 HCU replacement kit (wet), 10 valves unit, w/ECU (10 coil), RWD, w/ATC, w/PB plug,

w/o brackets, w/reservoir (detached). S400 850 877 0 S400 850 877 7 HCU replacement kit (wet), 10 valves unit, w/ECU (10 coil), RWD, w/ATC,

w/Parking Brake, w/o brackets, w/reservoir (detached). S400 850 879 0 S400 850 879 7 HCU replacement kit (wet), 12V, 8 valves unit, w/o ECU (8 coil), w/o ATC, w/o brackets;

w/reservoir (detached). S400 850 878 0 S400 850 878 7 HCU replacement kit (wet), 10 valves unit, w/o ECU (10 coil), RWD, w/ATC, w/PB plug,

w/o brackets, w/reservoir (detached). S400 850 880 0 S400 850 880 7 HCU replacement kit (wet), 10 valves unit, w/o ECU (10 coil), RWD, w/ATC,

w/Parking Brake, w/o brackets, w/reservoir (detached). S400 850 876 0 S400 850 876 7 HCU replacement kit (wet), 12V, 8 valves unit, w/ECU (8 coil), w/o ATC, w/o brackets,

w/reservoir (detached).

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New Service Exchange New Service Exchange

HCU with ECU S400 850 875 0 S400 850 875 7 S400 850 876 0 S400 850 876 7HCU with ECU - Parking Brake S400 850 877 0 S400 850 877 7 not available not available

HCU without ECU S400 850 878 0 S400 850 878 7 S400 850 879 0 S400 850 879 7HCU without ECU - Parking Brake S400 850 880 0 S400 850 880 7 not available not available

HPB ECU w/ ATC S400 850 881 0 S400 850 881 7 not available not availableHPB ECU w/o ATC Front Wheel Drive not available not available S400 850 883 0 S400 850 883 7HPB ECU w/o ATC Rear Wheel Drive not available not available S400 850 882 0 S400 850 882 7

HPB ECU Hardware Kit S446 046 921 2 not available S446 046 921 2 not available

HCU Reservoir Kit S451 900 922 2 not available S451 900 922 2 not availableReservoir Rubber Grommet Kit S451 900 923 2 not available S451 900 923 2 not available

Accumulator Kit S458 501 924 2 not available S458 501 924 2 not available

Accumulator O-Ring Kit S458 501 923 2 not available S458 501 923 2 not available

Pressure Supply Valve Kit S476 901 920 2 not available S476 901 920 2 not availablePressure Supply Valve Coil Kit S476 901 920 2 not available S472 879 920 2 not availableParking Brake Switch - 2nd Generation S446 280 001 0 not available S446 280 001 0 not availableParking Brake Switch - 2nd Generation with Short Bracket S446 280 012 0 not available S446 280 012 0 not availableParking Brake Switch - 2nd Generation with Long Bracket S446 280 022 0 not available S446 280 022 0 not availableParking Brake Switch - 3rd Generation S446 280 002 0 not available S446 280 002 0 not availableParking Brake Switch - 3rd Generation with Short Bracket S446 280 013 0 not available S446 280 013 0 not availableParking Brake Switch - 3rd Generation with Long Bracket S446 280 023 0 not available S446 280 023 0 not available

Parking Brake Knob S446 280 790 4 not available S446 280 790 4 not available

Relay Valve - ATC S478 407 929 2 not available S478 407 929 2 not available

Relay Valve - No ATC S478 407 930 2 not available S478 407 930 2 not available

Pump Replacement Kit S478 407 928 2 not available S478 407 928 2 not availableRelay Valve Bleeder Screw Kit S478 407 921 2 not available S478 407 921 2 not availableHCU Hardware Mounting Kit R950054 not available R950054 not availableHCU Mounting Bracket - Front S478 901 052 2 not available S478 901 052 2 not availableHCU Mounting Bracket - Rear S478 901 053 2 not available S478 901 053 2 not available

HYDRAULIC COMPACT UNIT (HCU) COMPONENTS

Hydraulic Power Brake (HPB) Quick Reference

Truck Applications (8 Coil)Bus Applications (10 Coil)

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ELECTRONIC CONTROL UNIT (ECU) ECU REPLACEMENT

KIT PART NO. SERVICE EXCHANGE

PART NO. APPLICATION INFORMATION

S446 046 921 2 ECU hardware kit. Contains two pressure seals and four

screws. For 8 coil and 10 coil applications S400 850 881 0 S400 850 881 7 ECU replacement kit, ABS with ATC, 10 coils ECU, 12V. Kit

contains ECU, 2 pressure sensor seals and 4 screws.

S400 850 883 0 S400 850 883 7 ECU replacement kit, ABS only, without ATC, 8 coils ECU, 12V; FWD. Kit contains ECU, 2 pressure sensor seals and 4 screws.

S400 850 882 0 S400 850 882 7 ECU replacement kit, ABS only, without ATC, 8 coils ECU, 12V; RWD. Kit contains ECU, 2 pressure sensor seals and 4 screws.

HCU RESERVOIR KIT PART NO.

SERVICE EXCHANGE PART NO. APPLICATION INFORMATION

S451 900 922 2 S451 900 922 7 Kit contains HCU reservoir, four screws, reservoir plug and four rubber grommets. For 8 coil and 10 coil application.

S451 900 923 2 Kit contains four rubber grommets. For 8 coil and 10 coil application.

ACCUMULATOR KIT PART NO. APPLICATION INFORMATION

S458 501 924 2 Kit contains two 750 ccm accumulators labeled with warning statement and two o-rings. For 8 coil and 10 coil application.

S458 501 923 2 Kit contains two o-rings. For 8 coil and 10 coil application.

PRESSURE SUPPLY VALVE KIT PART NO.

SERVICE EXCHANGE PART NO. APPLICATION INFORMATION

S442 879 920 2 Pressure Supply Valve Coil Kit contains coil, nut and o-ring. For 8 coil and 10 coil application.

S476 901 920 2 S476 901 920 7 Pressure Supply Valve Kit includes solenoid valve with coil, o-ring and nut. For 8 coil and 10 coil application.

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PARKING BRAKE SWITCH Mounted on the cab, not on the HCU

KIT PART NO. APPLICATION INFORMATION S446 280 001 0 Kit contains second generation switch (with new Deutsch connector). S446 280 790 4

(Dash Knob) not included. For 8 coil and 10 coil application.

S446 280 002 0 Kit contains third generation switch (with Deutsch connector and redundancy circuit). S446 280 790 4 (Dash Knob) not included. For 8 coil and 10 coil application.

S446 280 012 0 Kit contains second generation switch and short bracket. S446 280 790 4 (Dash Knob) not included. For 8 coil and 10 coil application.

S446 280 013 0 Kit contains third generation switch and short bracket. S446 280 790 4 (Dash Knob) not included. For 8 coil and 10 coil application.

S446 280 022 0 Kit contains second generation switch and long bracket. S446 280 790 4 (Dash Knob) not included. For 8 coil and 10 coil application.

S446 280 023 0 Kit contains third generation switch and long bracket. S446 280 790 4 (Dash Knob) not included. For 8 coil and 10 coil application

S446 280 790 4 Not included in the parking brake switch replacement kit. For 8 coil and 10 coil application.

RELAY VALVES KIT PART NO.

SERVICE EXCHANGE PART NO. APPLICATION INFORMATION

S478 407 929 2 S478 407 929 7 With Automatic Traction Control (ATC). Kit contains a relay valve and a seal plate. For 8 coil and 10 coil application.

S478 407 937 2 S478 407 937 7 Without ATC. Kit contains a relay valve and a seal plate. For 8 coil and 10 coil application.

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HYDRAULIC PUMP KIT PART NO.

SERVICE EXCHANGE PART NO. APPLICATION INFORMATION

S478 407 928 2 S478 407 928 7 Kit contains pump and seal plate. For 8 coil and 10 coil application.

HCU ACCESSORIES KIT PART NO. APPLICATION INFORMATION

R950054 Kit includes four bushings, and four 10 mm screws. For use with front (S478 901 052 2) and rear (S478 901 053 3) mounting brackets. For 8 coil and 10 coil application.

S478 407 921 2 Kit contains two relay valve bleeder screws and two protective caps. For 8 coil and 10 coil application.

S478 901 052 2 Front mounting bracket. Mounting hardware not included. Order Kit R950054 for mounting hardware. For 8 coil and 10 coil application.

S478 901 053 2 Rear mounting bracket. Mounting hardware not included. Order Kit R950054 for mounting hardware. For 8 coil and 10 coil application.

HPB MASTER CYLINDER ASSEMBLY

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New Service Exchange New Service Exchange

Master Cylinder/Reservoir Assembly with Travel Switch S468 411 005 0 not available S468 411 005 0 not availableReservoir with Fluid Level Switch S468 413 020 2 not available S468 413 021 2 not availableReservoir Kit - No Cap R950055 not available R955421 not availableMaster Cylinder Kit R950056 not available R950056 not availableReservoir Cap S451 900 474 2 not available S451 900 474 2 not availableMaster Cylinder Bracket S478 901 054 0 not available S478 901 057 2 not availableTravel Switch Kit S468 411 923 2 not available S468 411 923 2 not availableFluid Level Switch S468 413 921 2 not available S468 413 921 2 not availableRoll Pin Kit R950057 not available R950057 not availableRubber Grommet Kit S451 900 924 2 not available S451 900 924 2 not availableClevis Pin Kit S451 900 925 2 not available S451 900 925 2 not available

Bus Applications

MASTER CYLINDER/RESERVOIR ASSEMBLY COMPONENTS

HPB Master Cylinder Quick Reference

Truck Applications

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MASTER CYLINDER ASSEMBLY KIT PART NO. APPLICATION INFORMATION

R950055 Kit contains master cylinder reservoir, fluid level switch, 2 rubber grommets and washers. Cap not included. For bus applications only.

R955421 Kit contains master cylinder reservoir, travel switch and screw, 2 rubber grommets and washers. Cap not included. For medium duty truck applications only.

R950056 Kit contains master cylinder, screws, 2 rubber grommets and washers, 2 roll pins.

S451 900 474 2 Master cylinder cap. Fits all master cylinder reservoirs. For bus and medium duty truck application.

S478 901 054 0 Use with master cylinder 468 411 005 0 & reservoir 468 413 020 2. For bus applications.

S478 901 057 2 Use with master cylinder 468 411 005 0 and reservoir 468 413 021 2. For medium duty truck applications.

MASTER CYLINDER TRAVEL SWITCH KIT PART NO. APPLICATION INFORMATION

S468 413 921 2 Kit contains fluid level switch.

S451 900 925 2 Kit contains one master cylinder clevis pin.

S468 411 923 2 Kit contains travel switch, gasket and 2 screws. For vehicles built prior to 2005.

R950057 Kit contains two roll pins.

S451 900 924 2 Kit contains two rubber grommets.

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STRAIGHT SENSORS CABLE LEAD

KIT NUMBER SENSOR FEET METERS APPLICATION INFORMATION R955431

S941 032 263 0 2.72 0.83

R955430 S441 032 346 0 3.74 1.14

Typically installed in heavy front axle applications (16,000 - 20,000 GAWR) at wheel ends to measure the motion of a sensed wheel in ABS applications. Sensor kits include sensor with cable leads, spring clip, lubricant and instruction sheet. When replacing a sensor you must also replace the spring clip.

RIGHT ANGLE (90°) SENSORS CABLE LEAD

KIT NUMBER SENSOR FEET METERS APPLICATION INFORMATION R955432 S941 032 261 0 2.50 0.70 R955436 S941 032 262 0 2.80 0.86 R955434 S941 032 266 0 3.10 0.90 R955437 S941 032 265 0 3.20 0.99 R955438 S941 032 267 0 3.30 1.00 R955433 S941 032 264 0 3.50 1.07 R955439 S941 032 269 0 4.47 1.46 R955435 S941 032 268 0 4.60 1.40

Installed at wheel ends to measure the motion of a sensed wheel in ABS applications. Sensor kits include sensor with cable leads, spring clip, lubricant and instruction sheet. When replacing a sensor you must also replace the spring clip.

SENSOR EXTENSION CABLES LENGTH

PART NUMBER FEET METERS APPLICATION INFORMATION S449 711 015 0 4.9 1.5 S894 590 058 2 9.8 3.0 S449 711 031 0 10.0 3.1 S449 711 050 0 16.4 5.0 S449 711 065 0 21.3 6.5 S449 711 080 0 26.4 8.0 S449 711 100 0 32.8 10.0

S449 711 120 0 39.4 12.0

Features blunt cut cable. Two-wire cable that connects the wheel end sensors to the ECU. Do not splice cable wires. Cut cables from the blunt cut end. Splicing wires will void the warranty.

SENSOR CLIPS PART NUMBER I.D. O.D. LENGTH APPLICATION INFORMATION

R955458 Chrome nickel sensor clip. Contains sensor clip and grease packet. Holds sensor in place.

R955459

0.63" / 16.0 mm

0.71" / 18.0 mm

1.18" / 30.0 mm

Copper-beryllium sensor clip. Includes sensor clip and grease packet. Holds sensor in place.

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TOOTH WHEELS PART

NUMBER I.D. O.D. NO. OF TEETH

INSERT DIA. APPLICATION INFORMATION

3237-L-1260 5.01" 6.78" 100 3237-D-1070 5.11" 6.45" 100 3237-Q-1031 5.12" 7.50" 100 3237-R-1032 5.43" 7.68" 100 3237-G-1047 5.99" 7.28" 100 6.31" 3237-Y-1195 6.30" 7.26" 100 3237-K-1051 6.43" 7.06" 100 3237-V-1192 6.44" 7.56" 100 09-001867 6.49" 7.05" 100 3237-T-1242 6.50" 8.37" 80 3237-H-1256 6.51" 7.30" 100 3237-V-1062 6.87" 7.91" 100

3237-P-1056 7.79" 8.62" 100

Before replacing a tooth wheel, contact either the OEM or the hub manufacturer to see if the wheel and hub are sold as one unit. Part numbers listed are for tooth wheels manufactured by ArvinMeritor.

DIAGNOSTIC AND TEST EQUIPMENT APPLICATION INFORMATION

TOOLBOX™ Software is a PC-based diagnostics program for use with Meritor WABCO HPB. With this program the technician can display system faults and wheel speed data, test individual components, perform brake bleed procedures, verify wiring installation and more. TOOLBOX version 8.0 or higher is recommended for HPB diagnostics. Software part number is TOOLBOX. Contact SPX at 1-800-328-6657 to order.

INFORMATION CROSS REFERENCE MERITOR WABCO PART NO.

ON WHITE LABEL DESCRIPTION WABCO PART NUMBER

ON BLUE LABEL SERVICE PART

NUMBER APPLICATION 478 407 132 0 12V, 4x4 400 850 606 0 12V, FWD 478 407 114 0 478 407 136 0

12V, RWD

478 407 112 0 S400 850 876 0 8 coil

478 407 113 0 478 407 135 0

12V, RWD, w/ATC 478 407 111 0

478 407 116 0 12V, RWD, w/PB 478 407 133 0 12V, RWD, w/PB, 4x4 478 407 126 0 478 407 134 0 478 407 137 0

12V, RWD, w/PB, w/ATC

478 407 125 0

S400 850 875 0 10 coil

NUMERICAL PARTS LISTING

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PART NUMBER PAGE

PART NUMBER PAGE

PART NUMBER PAGE 09-001867 10 3237-Q-1031 10 3237-R-1032 10 3237-G-1047 10 3237-K-1051 10 3237-P-1056 10 3237-V-1062 10 3237-D-1070 10 3237-V-1192 10 3237-Y-1195 10 3237-H-1256 10 3237-L-1260 10 R950054 6 R950055 8 R950056 8 R950057 8 R955421 8 R955430 9 R955431 9 R955432 9 R955433 9 R955434 9 R955435 9 R955436 9 R955437 9 R955438 9 R955439 9 S400 850 881 0 4 S400 850 881 7 4 S400 850 882 0 4 S400 850 882 7 4 S400 850 875 0 2,10 S400 850 875 7 2 S400 850 876 0 2,10 S400 850 876 7 2 S400 850 877 0 2 S400 850 877 7 2 S400 850 878 0 2 S400 850 878 7 2 S400 850 879 0 2 S400 850 879 7 2 S400 850 880 0 2 S400 850 880 7 2 S400 850 883 0 4 S400 850 883 7 4 S441 032 346 0 9 S442 879 920 2 4 S446 046 921 2 4 S446 280 001 0 5 S446 280 002 0 5 S446 280 012 0 5 S446 280 013 0 5 S446 280 022 0 5 S446 280 023 0 5 S446 280 790 4 5 S449 711 015 0 9

S449 711 031 0 9 S449 711 050 0 9 S449 711 065 0 9 S449 711 080 0 9 S449 711 100 0 9 S449 711 120 0 9 S449 711 150 0 9 S451 900 474 2 8 S451 900 922 2 4 S451 900 922 7 4 S451 900 923 2 4 S451 900 924 2 8 S451 900 925 2 8 S458 501 923 2 4 S458 501 924 2 4 S468 411 923 2 8 S468 413 921 2 8 S476 901 920 2 4 S476 901 920 7 4 S478 407 921 2 6 S478 407 928 2 6 S478 407 928 7 6 S478 407 929 2 5 S478 407 929 7 5 S478 407 937 2 5 S478 407 937 7 5 S478 901 052 2 6 S478 901 053 2 6 S478 901 054 0 8 S478 901 057 2 8 S894 590 058 2 9 S941 032 261 0 9 S941 032 262 0 9 S941 032 263 0 9 S941 032 264 0 9 S941 032 265 0 9 S941 032 266 0 9 S941 032 267 0 9 S941 032 268 0 9 S941 032 269 0 9 TOOLBOX 10

Meritor WABCO Vehicle Control Systems Information contained in this publication was in effect at the time the publication was approved2135 West Maple Road for printing and is subject to change without notice or liability. Meritor WABCO reserves the Troy, Michigan 48084-7121 right to revise the information presented or discontinue the production of parts at any time.888-725-9355www.meritorwabco.com copyright 2009 Revised 6/09xpresswayplus.arvinmeritor.com Meritor WABCO Printed in U.S.A. PB-06107