I have a 2006 Ford F-150, and recently BOTH front brakes began dragging suddenly. When I crack open the front brake line at the master cylinder, which controls both front calipers, both brakes release about 70%, but there’s still noticeable drag remaining. Interestingly, the brakes can re-stick even with the engine off—just pressing the brake pedal once is enough to cause them to drag again. After sitting for about 30 minutes, the calipers gradually release on their own to the same degree as when I manually relieve pressure by cracking the line, though they never fully disengage. This suggests a possible pressure issue, but I’m confused because even after relieving hydraulic pressure, the brakes still don’t completely free up. Could this mean there’s also a mechanical issue with the calipers themselves? It seems unlikely that both calipers would mechanically fail at the same time, but I’m wondering if it’s possible to have a simultaneous mechanical and hydraulic issue. I’d appreciate any insight into what could cause both front brakes to drag this way.

Edit: Rotors, Calipers, Pads, Hoses, and Master cylinder all were replaced between 11-4 months ago.

 

my first inclination is the rubber brake hoses are restricted

 

Were pads put on recently?

 

11 months ago I got new pads rotors rubber lines and calipers

 

the hoses are less than a year old. Also if the rubber hoses are holding pressure between the hose and caliper, wouldn’t opening the Master cylinder line upstream of the blockage not do anything?

 

My first thought is that the brake calipers sliding pins are sticking, so I'd check them first. Pull the calipers and push in on the pins. They should immediately and smoothly come back out.

After reinstalling the calipers, observe whether the pads are releasing when someone presses the brake pedal and releases it.

Let us know whether this fixes it. There are other possible causes.

 

brake booster.

 

Any progress, action taken?