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SD-13-4958 |
Bendix® M-40QR™ and M-40HF™ Pressure Modulator Valves |
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Bendix® M-40QR™ |
Delivery Port |
Bendix |
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M-40HF |
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(Casting has |
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Supply Port |
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Modulator |
“2, DEL”) |
Modulator |
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(Casting has |
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“1, SUP”) |
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Supply |
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Port |
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(Casting has |
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“1, SUP”) |
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Electrical |
Alternate Push-to- |
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Electrical |
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Connector |
Connect Version, |
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Showing Optional |
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Connector |
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Packard Connector |
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Previous Model |
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M-32™ Modulators |
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Mounting Holes |
Exhaust Port |
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Exhaust Port |
(.33" Diameter |
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(Body has |
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Bendix M-32QR™ (left) and M-32™ |
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Through Body) |
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(Body has “3, EXH”) |
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“3, EXH”) |
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(right) Modulators |
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FIGURE 2 - M-32™ MODULATORS |
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DESCRIPTION |
FIGURE 1 - M-40QR™ AND M-40HF™ PRESSURE MODULATOR VALVES |
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The Bendix® M-40QR™ (quick release) and M-40HF™ (high flow) pressure modulator valves (PMVs) are high-capacity, on/off air valves that incorporate a pair of electrical solenoids for control. See Figure 1. The solenoids provide the electro-pneumatic interface between the vehicle’s electronic control system and the air brake system. For example, the PMV is used to control the braking function of service actuators during antilock activity.
The modulator consists of a die cast metal and plastic body that houses one normally-open solenoid, one normallyclosed solenoid, and an inlet and exhaust diaphragm valve. A three-pin weather-resistant electrical connector is an integral part of the modulator solenoid assembly and delivers the vehicle controller’s commands to the modulator. Two mounting holes are provided for frame or crossmember mounting of the valve.
The Bendix M-40QR modulator is the direct replacement for the Bendix M-32QR modulator (See Figure 2). The Bendix M-40QR modulator has a bias valve to provide an internal quick-release function.
The supply, delivery and exhaust ports on the Bendix M-40 modulators have embossed identification codes.
Port ID |
Air Hose |
Function |
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Connection |
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1, SUP |
Supply |
Air enters from a valve (typically |
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foot, relay or quick release). |
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2, DEL |
Delivery |
Air is delivered to the service |
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actuators. |
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3, EXH |
Exhaust |
Air is vented to the atmosphere. |
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FIGURE 3 - PORT DESIGNATION AND FUNCTION
APPLICATIONS
Bendix M-40 modulators may be used for various purposes on a vehicle including ABS and stability interventions. In applications using these PMVs, an external quick release valve may also be required, depending on the system design. Where the modulator is used for individual wheel control applications, it is typically the last control valve through which air passes on its way to the service brake actuator. See Figure 4 for a typical system schematic.
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GENERAL SAFETY GUIDELINES
WARNING! PLEASE READ AND FOLLOW THESE INSTRUCTIONS
TO AVOID PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following guidelines should be observed AT ALL TIMES:
▲Park the vehicle on a level surface, apply the parking brakes and always block the wheels. Always wear personal protection equipment.
▲Stop the engine and remove the ignition key when working under or around the vehicle. When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically-charged components.
▲Do not attempt to install, remove, disassemble or assemble a component until you have read, and thoroughly understand, the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools.
▲If the work is being performed on the vehicle’s air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with a Bendix® AD-IS® air dryer system, a Bendix® DRM™ dryer reservoir module, or a Bendix® AD-9si™ air dryer, be sure to drain the purge reservoir.
▲Following the vehicle manufacturer ’s recommended procedures, deactivate the electrical system in a manner that safely removes all electrical power from the vehicle.
▲Never exceed manufacturer’s recommended pressures.
▲Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted.
▲Use only genuine Bendix® brand replacement parts, components and kits. Replacement hardware, tubing, hose, fi ttings, etc. must be of equivalent size, type and strength as original equipment and be designed specifi cally for such applications and systems.
▲Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless specifi cally stated and approved by the vehicle and component manufacturer.
▲Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition.
▲For vehicles with Automatic Traction Control (ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving.
▲The power MUST be temporarily disconnected from the radar sensor whenever any tests USING A DYNAMOMETER are conducted on a Bendix® Wingman® Advanced™-equipped vehicle.
▲You should consult the vehicle manufacturer's operating and service manuals, and any related literature, in conjunction with the Guidelines above.
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SL-4™ Stop Light Switch |
Glad Hands |
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TP-5™ Tractor Protection Valve |
Wheel |
Pressure |
Modulator |
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Speed |
Valve |
Sensor |
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C |
Trailer (Control) |
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S Trailer (Supply) |
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Wheel
Speed
Sensor
Air Disc |
TCS-9000™ |
Antilock |
Brake |
Trailer |
Controller |
Service |
Control Valve |
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Brake |
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Chamber |
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Pressure |
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Modulator |
Steering Angle Sensor |
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Valve |
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Antilock |
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Primary Brake |
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Circuit |
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Traction |
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Yaw Rate Sensor |
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Relay |
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Valve |
Brake Valve |
Secondary |
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Pressure |
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Brake Circuit |
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Modulator |
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Valve |
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Air Disc |
Brakes |
Pressure Modulator Valve |
Antilock Relay Valve |
Pressure Modulator Valve
Service & Spring
Brake Chamber
Service Brake |
Chamber |
Foundation
Drum Brakes
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Wheel |
Spring Brake |
Slack Adjuster |
Chamber |
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Speed |
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Sensor |
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For Illustration Purposes Only, Both Air |
Foundation |
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Disc Brakes And Foundation Drum Brakes |
Drum Brakes |
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Are Shown At Either Side Of The Axles. |
Primary Brake |
Secondary |
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Circuit |
Brake Circuit |
FIGURE 4 - TYPICAL SYSTEM DIAGRAM (4S-4M SYSTEM SHOWN)
PRESSURE MODULATOR VALVE (PMV) AND TRACTION CONTROL VALVE (TCV) CHUFF TEST
A wiring harness connects the vehicle modulators to the controller. The ABS controller is able to simultaneously, and independently, control the individual modulators.
Bendix® Electronic Control Units (ECUs) perform a Bendixpatented PMV and TCV Chuff Test. The Chuff Test is an electrical and pneumatic PMV test that can assist maintenance personnel in verifying proper PMV wiring and installation. This test is performed only when the vehicle is stationary (if the vehicle moves, the Chuff Test will not be performed).
NOTE: If there are any active Diagnostic Trouble Codes (DTCs), the stop lamp cross-check portion of the Chuff Test will not be carried out until all DTCs are fully diagnosed and corresponding repairs are successfully conducted. The ESP/ATC dash indicator lamp ATC/ESP Lamp — a lamp that indicates when stability functions, including traction control, roll stability program or yaw control are operating
— will also be illuminated when there are active ABS,
ATC or ESP DTCs. (See the Glossary on page 8 for more information on these terms.)
See Figure 5. When ignition power is applied, each modulator solenoid is briefly energized. If the air system is fully charged — and the service brake pedal is depressed during ignition — the modulator creates a single, sharp audible “chuff” of air pressure. Bendix ECUs will perform a PMV Chuff Test on all installed modulators in the order shown in Figure 5. The pattern will then repeat itself.
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Right Steer |
Right Drive |
Right |
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Additional |
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1 |
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3 |
5 |
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7 |
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2 |
Driver |
4 |
6 |
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Left Steer |
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Left Drive |
Left |
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Additional |
1. |
Steer Axle Right PMV |
5. Additional Axle Right PMV |
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2. |
Steer Axle Left PMV |
6. Additional Axle Left PMV |
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3. |
Drive Axle Right PMV |
7. Drive Axle TCV |
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4. |
Drive Axle Left PMV |
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FIGURE 5 - TYPICAL VEHICLE ORIENTATION AND CHUFF SEQUENCE
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