Reported risk: On certain fire trucks equipped with the ALLSTEER option, the position of the front axle is sensed by an optical encoder mounted to the bottom of the front axle kingpin, which is protected from the elements by an outer case. This case shares a common grease cavity with the kingpin. Oil that leaches from the grease can migrate through the encoder seal, causing contamination of the optical encoder disc. Oil on the disc can cause the encoder to send incorrect wheel position information. Incorrect wheel position information can cause the rear wheels to steer unexpectedly and the vehicle to crash without prior warning. Correction: Dealers will install an encoder with more robust seals.
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