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GTS ABS failure

Brakes

Vehicle Information: Year: 1993; Engine (size, modifications): 5.4 L; Total Mileage: 32,900; Transmission type: Manual;

I purchased my '93 GTS from the original owner 11/03 with 33k original miles. Under moderate (60%) brake pedal pressure, both front wheels locked up. When I released the brake pedal, the left front rotor continued to hold the wheel in lockup, and finally released only after pumping the brake pedal. No ABS warning or malfunction indicators showed. My mechanic downloaded the faults, and a wheel speed sensor fault showed up on the left front only. He cleared the fault, drove the car, the left front locked up and did not release until he pumped the pedal. When downloading, no fault showed up at all. So far the mechanic has ruled out relays and control unit, and all wiring appears undamaged. Can you shed some light on this?

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