My 87 D150 is having sporadic braking issues. When it happens, with very light braking pressure, the driver side front brake will grab violently, locking up the wheel. This may happen a couple times, then is goes away for days at a time...not sure what is going on here.

Does anyone know what might be causing this?

Thanks in advance.

67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....