gq brakes not releasing

[kwdmtm]

Have a gq patrol with right hand front caliper dragging and causing pad and hub to get hot.
driving locally appears ok but on expressway gets quite hot.
have replaced master cylinder new , replaced calipers fully reconditioned, have replaced hydrolic hoses all the flexible ones , seems odd only d/s/f .
brakes work ok.
car has 3 inch lift with proportioning valve bracket to suit.
any ideas?

[threedogs]

did you do the left hand front?

[kwdmtm]

Yep have done all driving me insane..

[threedogs]

When you lubed the piston did it move in and out smoothly

[kwdmtm]

Purchased from patrolapart ,calipers like new ...slides were easy and smooth to operate and you could push pistons in with your hands very good o/haul but this problem has been there before i replaced the calipers thinking they were the problem.
l

[threedogs]

do you think you may have a crimped line somewhere, stopping the fluid from returning

[kwdmtm]

No as i can get a really good flow when bleeding ,none of it makes sense the supply line comes from the m/cyl to a distribution block ,front to rear the front goes directly to the rubber hydrolic line which is new then to the drivers and passenger side calipers, not rocket science, i'm stumped.
The only thing I can think of is the drivers supply is the shortest side so it is more suseptable if there is some form of blockeage but it would be a blockeage in one direction only. GEEE don't know So frustrating.

[threedogs]

just throwing it out there but is the pedal returning freely ?

[kwdmtm]

Yeah got the measurements from manual and its pretty damn close it gives a measurement also at the brake switch of .3 to 1mm and its good you can actually look at pedal pushrod and see free play before booster piston starts to move so it would suggest a clearance.

And thaks any suggestions are worth a thought at the moment ☺

[threedogs]

Im snookered can only think a crimped hose or linkages binding up.
I think as everything is new or newish is pull it all apart and re assemble it'
its all I have.

EDIT no the wheel bearing on that side is it

[kwdmtm]

To be honest haven't check Wheel bearing but they have no movement ,thank anyway threedogs will give it a go.

[threedogs]

Bumped any up date.???

[kwdmtm]

Lack of time at the moment will let you know,thanks mate

[kwdmtm]

Looks like I've worked it out maybe slackness on my behalf / over sight....
the brake pad backing shim has deformed , bowed and when piston pushes out it deforms more and when brake released the shim binds up in the upper and lower caliper mount and not allowing it to fully release.
I would never have thought such a skinny piece of tin would have such a gret effect,go figger.

[nicksamaniac]

Good to see you have a result.
Out of curiosity? Was it noticeably dragging and pulling the steering etc or was it just causing it to get hot at speed?

[kwdmtm]

Getting hot at speed heat was also transfered to the hubs and you could eventually start to smell the brakes.

[kwdmtm]

58612

Pic of brake pad shim