Product Description
The Bendix K128499 ET-2 Electronic Throttle Potentiometer Kit is a genuine replacement assembly designed for compatible Mack V-MAC electronic engine control systems. This kit allows technicians to replace a worn, damaged, or malfunctioning potentiometer in an existing Bendix ET-2 electronic accelerator pedal assembly without replacing the complete pedal mechanism.
The potentiometer plays an essential role in electronic throttle operation by converting accelerator pedal movement into a variable electrical signal. This signal communicates the driver's requested engine speed to the electronic engine control system, helping provide smooth acceleration and dependable throttle response.
The Bendix K128499 replaces the discontinued Bendix 550390 potentiometer kit and includes an adapter wiring harness for the updated potentiometer configuration. It is designed for specified Bendix ET-2 treadle assemblies used with Mack V-MAC electronic throttle systems.
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Genuine Bendix ET-2 electronic throttle potentiometer replacement kit
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Manufacturer Part Number: K128499
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Designed for compatible Mack V-MAC electronic engine control systems
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Replaces obsolete Bendix 550390 potentiometer kit
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Includes replacement throttle potentiometer components
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Includes Bendix K128910 adapter wiring harness
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Adapter harness OEM reference: K128052
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Compatible with Bendix ET-2 treadle assemblies 550344 and 065308
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Converts accelerator pedal movement into an electrical throttle-position signal
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Helps restore consistent electronic accelerator response
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Designed for servicing existing ET-2 electronic throttle assemblies
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Suitable for heavy-duty commercial truck maintenance
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Replacement kit for worn or malfunctioning potentiometers
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Complete accelerator pedal assembly not included
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New replacement kit
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Sold individually
The K128499 is a direct service replacement for Bendix 550390 in supported ET-2 electronic treadle assemblies. It is also associated with earlier part numbers 550266 and 3098642, along with Mack reference 4QB47-P2.
For more extensive mechanical repairs, Bendix identifies major repair kit 550394 and cable assembly 550342 as associated service components for compatible ET-2 assemblies. These additional components are not included unless specifically supplied with the product.
Before ordering, verify the original electronic throttle assembly number, engine control system, and connector configuration. Bendix produced several ET-2 potentiometer configurations for different engine manufacturers, and the kits are not universally interchangeable.
After installation, perform the operational tests outlined in the Bendix service instructions to confirm proper idle-position voltage, full-throttle output, and smooth potentiometer operation before returning the vehicle to service.
