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TP-20141 Revised 01-04 Workbook Meritor WABCO Air Brake Systems SECONDARY COLOR KEY SUPPLY SECONDARY PRIMARY PARK/EMERGENCY ABS ELECTRICAL TRAILER CONTROL TRAILER SUPPLY SECONDARY CONTROL PRIMARY TANK FROM PARK VALVE INSET (A) OPTION PRIOR TO MARCH 1, 1998 FMVSS-121 REGULATIONS INVERSION VALVE AND QUICK RELEASE VALVE (INCLUDES ANTI-COMPOUNDING) PRIMARY SUPPLY (WET TANK) ECU SECONDARY CONTROL TO SERVICE RELAY FROM PARK VALVE INSET (B) OPTION AFTER MARCH 1, 1998 FMVSS-121 REGULATIONS NEW INVERSION VALVE AND QUICK RELEASE VALVE (INCLUDES ANTI-COMPOUNDING) PRIMARY DELIVERY SIDE VIEW INSET (A) OR (B) TO SERVICE RELAY

Meritor WABCO Air Brake Systems · PDF fileTP-20141 Revised 01-04 Workbook Meritor WABCO Air Brake Systems SECONDARY 472 500 30. 0 MADE IN GERMANY 001 20/98 xxxxxx xxxxx x

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  • TP-20141Revised 01-04

    Workbook

    Meritor WABCOAir Brake Systems

    SECONDARY

    472 500 30. 0

    MADE IN GERMANY

    001 20/98

    xxxxx xx

    xxx

    xxxxx xx

    xxx

    xxxxx xx

    xxx

    xxxxx xx

    xxx

    COLOR KEYSUPPLYSECONDARYPRIMARYPARK/EMERGENCYABS ELECTRICALTRAILER CONTROLTRAILER SUPPLY

    SECONDARYCONTROL

    PRIMARYTANK

    FROM PARKVALVE

    INSET (A) OPTIONPRIOR TO MARCH 1, 1998 FMVSS-121 REGULATIONS

    INVERSION VALVE AND QUICK RELEASE VALVE(INCLUDES ANTI-COMPOUNDING)

    PRIMARY

    SUPPLY(WET TANK)

    ECU

    SECONDARYCONTROL

    TO SERVICERELAY

    FROM PARKVALVE

    INSET (B) OPTIONAFTER MARCH 1, 1998 FMVSS-121 REGULATIONS

    NEW INVERSION VALVE AND QUICK RELEASE VALVE(INCLUDES ANTI-COMPOUNDING)

    PRIMARYDELIVERY

    SIDE VIEW

    INSET (A) OR (B)

    TO SERVICERELAY

  • Introduction

    1

    Introduction

    The purpose of an air brake system on heavy duty vehicles is to convert air pressure to mechanical energy to activate the foundation brakes. Federal Motor Vehicle Safety Standard 121 dictates how this is to be done for over-the-road vehicles.

    The purpose of this book is to help you construct Meritor WABCO Truck and Tractor air systems. It will also help you identify air system components and understand how they relate to FMVSS-121.

    NOTE:

    The systems described in this workbook are generic air brake systems.

    Included in this book are:

    Truck Systems

    Air Supply

    Secondary Service

    Primary Service

    Parking

    Anti-Compounding

    Emergency (Prior to 3/1/98)

    Emergency (After 3/1/98)

    Tractor/Trailer Systems

    Tractor Parking & Trailer Air Supply

    Trailer Control

    For additional information, call ArvinMeritors Customer Service Center at 800-535-5560.

    Air Brake System Color Key

    COLOR KEYSUPPLYSECONDARYPRIMARYPARK/EMERGENCYABS ELECTRICALTRAILER CONTROLTRAILER SUPPLY

  • 2

    Truck

    Air Supply System

    TruckAir Supply System

    SUPPLY(WET TANK)

  • Truck

    Air Supply System

    3

    Compressor____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Air Dryer_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Supply Tank _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Pressure Relief Valve _________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Automatic/Manual Drain Valve__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Low Pressure Switch ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Governor ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

  • 4

    Truck

    Secondary Service System

    Secondary Service System

    SECONDARY

    SUPPLY(WET TANK)

  • Truck

    Secondary Service System

    5

    Pressure Control Check Valve ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Secondary Service Tank ______________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Manual Drain Valve___________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Air Gauge__________________________________________________________________________________________________________________________________________________________

    Dual Foot Control Valve ______________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Quick Release Valve __________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    ABS Modulator Valve_________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Service Chambers ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Manual Slack Adjusters_____________________________________________________________________________________________________________________________________________

    Automatic Slack Adjusters__________________________________________________________________________________________________________________________________________

  • 6

    Truck

    Primary Service System

    Primary Service System

    SECONDARY

    PRIMARY

    SUPPLY(WET TANK)

  • Truck

    Primary Service System

    7

    One-Way Check Valve ________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Primary Service Tank _________________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Manual Drain Valve_________________________________________________________________________________________________________________________________________________

    Air Gauge__________________________________________________________________________________________________________________________________________________________

    Dual Foot Control Valve ______________________________________________________________________________________________________________________________________________________________________________________________________________________________

    Service Relay Valve_________________________________________________________________________________________________________________________________________________

    ABS Modulator Valve_______________________________________________________________________________________________________________________________________________

    Spring Brakes______________________________________________________________________________________________________________________________________________________

    Manual Slack Adjusters_____________________________________________________________________________________________________________________________________________

    Automatic Slack Adjusters__________________________________________________________________________________________________________________________________________

    Two-Way Check Valve ______________________________________________________________________________________________________________________________________________

    Stoplight Switch _____________________________________________________________________________________________________________________________________________________________________________________________________________________________________

  • 8

    Truck

    Parking System

    Parking System

    PRIMARY

    SECONDARY

    SUPPLY(WET TANK)

  • Truck

    Parking System

    9

    Two-Way Check Valve _____________________________________________________________________________________________________________________________________________