front brake

[beermoney]

My drivers side front brake builds up pressure and drags. I replaced the caliper and hose, no change. I have to open bleed valve a lot to keep driving. I don't know what to try next. 1992 f250 diesel.

 

[icanfixall]

Remove the caliper and clean out the retainer pin groove in the mount and the caliper. then use antisieze to lube it. Might also want to replace the pins. They are cheap and come 2 in a pack.

 

[Bashby]

So cracking the bleeder releases it? If so the hose is usually the culprit. When it is acting up try loosening the line at the master cyl, if it doesn't release you have a restriction. Look for a crushed steel line. You can loosen the line at various spots to isolate the restriction.

 

[icanfixall]

A grat point was made about the flex line being the problem or a crushed steel line. Maybe you ran over something off roading and didn't tell us you "do the hard way home" sometimes.

 

[mblaney]

Are you sure that only the driver's side drags? Is the other front caliper seized (even one of the two cylinders)? The reason I am asking is that it seems peculiar that one would have pressure and not the other. I would try it again and see if the pressure will bleed off from the passenger side. If it does then look at the master cylinder (?).

If the passenger side bleeder won't vent pressure then you have isolated it to the one side. If it does vent it then the problem is most likely much further up the system. Pump it up again and see if loosening the front line fitting at the master cylinder lets it off.

 

[HammerDown]

I just went through this, replaced dragging passenger caliper and it was still dragging...***
Removed the brake 'hose' sure enough I could blow through both sides...***
Replaced with new hose > > > no more caliper drag!
Turns out, when the system would build heat the old brake hose would SWELL shut.
Now, because I had the drivers caliper off and moved that old hose around...noy that side caliper is dragging > > > new hose goes on tomorrow.

 

[beermoney]

thank you mblaney. It is the master cylinder. Is dorman a good one?

 

[HammerDown]

thank you mblaney. It is the master cylinder. Is dorman a good one?

I would thing 'if' it was the MS BOTH front calipers would drag.

 

[mblaney]

I would thing 'if' it was the MS BOTH front calipers would drag.

Read my original response. If the residual pressure is vent-able from both sides then yes both are actually dragging. I would suspect a problem with the other caliper - probably one of the pistons seized so the dragging is not as obvious.