Anti-Lock Braking Systems (ABS) for Trucks ... - Meritor WABCO

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Section 4Removal & InstallationSection 4Removal & InstallationComponent Removaland InstallationFigure 4.1WARNINGTo prevent serious eye injury, always wear safeeye protection when you perform vehiclemaintenance or service.CAUTIONUse the following procedures to avoid damage tothe electrical system and ABS/ATC components.When welding on an ABS- or ABS/ATC-equippedvehicle is necessary, disconnect power and groundleads from the ECU.SensorsWheel Speed Sensor Removal —Front AxleTo remove the sensor from the front axle:1. Put blocks under the rear tires to stop thevehicle from moving. Apply the parking brake.WARNINGBlock the wheels to prevent the vehicle frommoving. Support the vehicle with safety satnds.Do not work under a vehicle supported only byjacks. Jacks can slip and fall over. Serious personalinjury can result.2. Raise the front tires off the ground. Put safetystands under the axle.3. Remove the sensor from the steering knuckle.Use a twisting motion if necessary. Do not pullon the cable. Figure 4.1.4. Disconnect the fasteners that hold the sensorcable to other components.5. Disconnect the sensor cable from thechassis harness.See “Sensor Resistance” and “SensorAdjustment” for additional sensor information.Wheel Speed Sensor Installation —Front AxleTo replace the sensor in the front axle:1. Connect the sensor cable to the chassis harness.2. Install the fasteners used to hold the sensorcable in place.3. Apply a mineral oil-based lubricant that containsmolydisulfide to the sensor spring clip and tothe body of the sensor. The lubricant shouldhave excellent anti-corrosion and adhesioncharacteristics, and be capable of continuousfunction in a temperature range of –40° to 300°F(–40° to 150°C).4. Install the sensor spring clip. Make sure theflange stops are on the inboard side ofthe vehicle.5. Push the sensor spring clip into the bushing inthe steering knuckle until the clip stops.6. Push the sensor completely into the sensorspring clip until it contacts the tooth wheel.7. Remove the blocks and safety stands.Wheel Speed Sensor Removal —Rear AxleTo remove the sensor from the rear axle:WARNINGBlock the wheels to prevent the vehicle frommoving. Support the vehicle with safety satnds.Do not work under a vehicle supported only byjacks. Jacks can slip and fall over. Serious personalinjury can result.1. Put blocks under the front tires to stop thevehicle from moving.Page 27
Section 4Removal & Installation2. Raise the rear tire off the ground. Put safetystands under the axle.3. Release the parking brake and back off theslack adjuster to release the brake shoes.4. Remove the wheel and tire assembly fromthe axle.5. Remove the brake drum.6. Remove the sensor from the mounting block inthe axle housing. Use a twisting motion ifnecessary. Do not pull on the cable.7. Remove the sensor spring clip from themounting block.8. Disconnect the fasteners that hold thesensor cable and the hose clamp toother components.9. Disconnect the sensor cable from thechassis harness.Wheel Speed Sensor Installation —Rear Axle1. Apply a mineral oil-based lubricant thatcontains molydisulfide to the sensor springclip and to the body of the sensor. Thelubricant should have excellent anti-corrosionand adhesion characteristics, and be capable ofcontinuous function in a temperature range of–40° to 300°F (–40° to 150°C).2. Install the sensor spring clip. Make sure theflange stops are on the inboard side ofthe vehicle.3. Push the sensor spring clip into the mountingblock until it stops.4. Push the sensor completely into the sensorspring clip until it contacts the tooth wheel.Figure 4.2.5. Insert the sensor cable through the hole in thespider and axle housing flange. Route thecable to the frame rail. Be sure to route thecables in a way that will prevent pinching orchafing and will allow sufficient movement forsuspension travel.Figure 4.21 Spring Clip2 Sensor Holder3 Spring Clip Tab4 Sensor6. Connect the sensor cable to thechassis harness.7. Install the fasteners that hold the sensorcable in place.8. Install the brake drum on the wheel hub.9. Complete the installation per vehiclemanufacturer's manual.ValvesABS Modulator Valve Removal1. Turn ignition switch to the OFF position, applyparking brake.2. Put blocks under the front and rear tires to stopthe vehicle from moving.WARNINGBlock the wheels to prevent the vehicle frommoving. Support the vehicle with safety satnds.Do not work under a vehicle supported only byjacks. Jacks can slip and fall over. Serious personalinjury can result.3. If necessary, raise the vehicle off the groundand put safety stands under the axle.4. Disconnect the wiring connector from theABS valve.Page 28
Page 1 and 2: Anti-Lock Braking Systems(ABS) for
Page 3 and 4: Table of ContentsAsbestos and Non-A
Page 5 and 6: NotesPage 2
Page 7 and 8: Section 1IntroductionABS Components
Page 9 and 10: Section 1IntroductionFigure 1.9Opti
Page 11 and 12: NotesPage 8
Page 13 and 14: Section 3TroubleshootingErasing a f
Page 15 and 16: Section 3TroubleshootingBlink Code
Page 17 and 18: Section 3TroubleshootingAdditional
Page 19 and 20: Section 3TroubleshootingAdditional
Page 21 and 22: Section 3TroubleshootingFigure 3.7F
Page 23 and 24: Section 3TroubleshootingTable 1 —
Page 25 and 26: Section 3TroubleshootingFinal Test
Page 27 and 28: Section 3TroubleshootingSensorsFigu
Page 29: Section 3TroubleshootingDynamometer
Page 33 and 34: Section 5WiringSection 5WiringThis
Page 35 and 36: Section 5WiringABS/ATC Wiring Schem
Page 37 and 38: Section 5WiringABS/ATC Wiring Schem
Page 39 and 40: Section 5WiringFront/Rear Configura
Page 41 and 42: Section 5WiringIn-Cab ECU Wiring Di
Page 43: Meritor WABCOVehicle Control System

Anti-Lock Braking Systems (ABS) for Trucks ... - Meritor WABCO

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