Since the introduction of the Fox Mustang, owners have always wanted upgraded brake setups. When incorporating a rear disc conversion, fine-tuning is needed for the rear brake bias. This is where an adjustable proportioning valve comes into place.
To begin, If any brake components have been recently changed, ensure all air has been properly bled from the system. Also, ensure that the tires on your vehicle are properly inflated to the manufacturer's specifications. For the best results, have a friend with you and ensure you are in a safe area where you can make repetitive stops from 30 MPH to 0 MPH. Normally, a parking lot or a gravel road works best here. Also, ensure you have half of a tank of fuel, no passengers in the car, and minimal loose items in the vehicle's cabin.
TECH NOTE: When bleeding your brakes, it can be helpful to turn the proportioning valve all the way in to make bleeding easier. Make a note of how many rotations it takes to fully in, then adjust back out the same amount when finished with bleeding.