Are you referring to the pressure-differential valve under the master cylinder? That is spring-loaded. It's only on Fords that centering that valve is extremely frustrating. If the warning light is on, a good hard jab on the brake pedal will reset it if it is stuck. That valve won't prevent brake fluid from flowing to the calipers.
Please consider a to help us answer more questions.
Wednesday, March 2nd, 2011 AT 5:14 AM