Front Disc Brakes Dragging
I've got a 1937 Dodge pickup setting on a 1989 S10 Frame.
The trucks got over 7000 miles with no braking problems until last week when the front brakes started dragging slightly. They start dragging after heating up, no problems when cool. When they start dragging I can jab the pedal a few times and they will release. After the brakes cool slightly there is no excess drag. The master is a Corvette style dual so if the pedal or piston were hanging up then the front and rear should be dragging. Both front brakes have an equal amount of drag and there is no pulling left or right when the brakes are applied.
I thought it might be the residual valve but it's several feet from the calipers and not affected by heat. I could see one caliper dragging because the piston was sticking but both have the same amount if drag like the pressure is not being released completely.
Stock disc up front
2001 Blazer rearend with disc
Corvette style dual master cylinder-mounted under the floor with 8" booster
Front 2lb residual valve
Rear 2lb residual valve with proportional valve
All new steel lines
All new flex lines