If possible go to a gravel road and see if both front brakes are the issue or just one side.
Also for the rear
Or does it pull to one side?
Does the brake pedal come all the way up?
Can you lift it more with your foot, or hand?
There are a few things that can cause this.
Broken return spring
Broken/open atmosphere valve on power booster
master cylinder problem
Power booster uses engine vacuum on one side of its diaphragm
The other side of diaphragm, facing the cab, there an atmosphere valve on the brake pedal rod.
When you press on brake pedal it opens the atmosphere valve allowing outside air pressure to assist you in pushing down on the pedal.
If brake pedal is not coming back up all the way then atmosphere valve stays open applying pressure to brakes.
Or if atmosphere valve is leaking then pressure is being applied
Last edited by RonD; 05-18-2016 at 08:47 AM.