Product Description
The Bendix K128912SC M-40QR ABS Modulator Valve is a heavy-duty pneumatic and electronic braking component designed for commercial vehicle anti-lock braking systems. Working in conjunction with the ABS electronic control unit (ECU), this valve rapidly adjusts air pressure delivered to the brake chambers to help prevent wheel lockup during braking.
Featuring a quick-release design, the M-40QR allows controlled application, holding, and exhaust of compressed air during ABS operation. Its integrated solenoid valves respond to electrical commands from the ABS controller, helping maintain vehicle stability and steering control during sudden braking or slippery road conditions.
Manufactured for demanding commercial truck operating environments, the K128912SC features a durable housing, 12-volt electrical operation, and standard threaded pneumatic connections. It is designed as a replacement for compatible Bendix M-40QR modulator configurations.
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Genuine Bendix M-40QR ABS modulator valve
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Manufacturer Part Number: K128912SC
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12-volt nominal electrical operation
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Quick-release (QR) modulator configuration
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1/2"-14 NPT supply port
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1/2"-14 NPT delivery port
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Circular 3-way DIN twist-lock electrical connector
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Nominal current: 4.6 amps
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Maximum operating pressure: 150 PSI
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Operating temperature range: -40°F to 185°F
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Integrated exhaust port with dust shield
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Two mounting holes, approximately 0.335 inches in diameter
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Helps regulate air brake pressure during ABS activation
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Designed for compatible heavy-duty commercial vehicle braking systems
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Cross-reference: K079664
The K128912SC is listed as a new aftermarket-service replacement and may have a core charge, depending on the supplier.
Before ordering, verify the existing modulator part number, electrical connector style, voltage, mounting configuration, and air port sizes. Bendix M-40 modulators are available in different configurations and are not universally interchangeable.
