Truck brake problems

Two wheel drive Expedition. New calipers and freshly bled lines but both are reluctant to release with no pressure. What am I missing?

 

are they new lines? sometimes the old lines swell and hold pressure. Cost me a set of rotors once.

 

Hoses collapsed ? Have seen that a few times.

 

Great minds think alike...

 

Proportioning valve/system malfunction. Reservoir overfilled.??

 

Air in the lines will do that too

 

Overfilled reservoir costs nothing to fix; check this first.

Old, rotten hoses are the next most likely culprit. I also ruined a freshly turned rotor because of a bad hose.

 

Timing is weird. No problems during the morning commute but they don't like release on the return trip. Almost identical use on both trips. Bled all 4 lines until clean, New fluid came out. Lines are cheap enough so I'll swap them.

 

Pad springs. The pads get hot and stick. It is a common issue on Tacoma fronts. Get new springs, if each caliper has only one spring, get a second set and have two per side.
No more drag, noise, click when they finally release for me.

 

+1 on proportioning valve.

 

It's a Ford.

 

Says the Dodge mini van owner.

 

As others have said, brake hoses. Just went through this on a Jeep Rubicon. The hose(s) will get worse as the temps rise till the calipers won't release at all. My passenger front did just that.

 

I'm changing hoses first, then proportioning valve if needed. Thanks for help!

 

Used to be.

Now I'm a Freightliner driver. Don't even have a personal vehicle anymore.

 

Did anyone recently adjust the pushrod distance in the booster to the master cylinder?
On my old Ford (2005) I used to sand the ends of the pad backing plate down some to allow clearance in the caliper bracket. It allowed the pads to slide easier. If you're in a hurry you could pull off one of the S/S shims on the side that doesn't take the braking force when moving forward.

 

Freightshakers aren't much better.

 

Crack the bleeder on a caliper to see if it realeases, if it does you have hydraulic pressure causing the issue (likely the hose from the frame to axle), if it doesn't release you have a mechanical issue with the calipers or pads etc..

 

But I am not paying for any repairs, and I get paid while it is being worked on.

 

Proportioning valve is combined with ABS and nobody seems to have one!