The Park/Brake light on the dash is flashing 5 times and then pauses for a secon on 1993 Chevrolet 3500 Pickup

the park/brake light is flashing in a series of five flashes what can be wrong?

Asked by for the 1993 Chevrolet 3500 Pickup
you need a shop with a scan tool to read the code and determine the failure in the system. it could be a wheel speed sensor or the float switch in the master, any one of a lot of items that can fail.