GQ Patrol brake booster

The only way that could cause brake drag is if it is too long keeping the brakes engauged. If you have free pedal travel (pedal moves a short distance without pressure ) that is not the problem.
Have you checked behind the rubber boots on the pistons as rust or other corrosion can cause this, especially if you do a lot of water crossings
I had one piston jamming and if wore the one disc pad out in no time, down to the metal, the other 3 were fine about 20% worn
Regards Kev

Not 100% sure but i doubt that rod would be adjustable mate.
I would agree with what Kev said above. Those calipers do cop a hiding. I overhaul mine every 18 months, and its amazing what you can find in the slides sometimes.
Just food for thought....front wheel drag.... are you trying to spin the wheels with your hands while its off the floor? there is supposed to be resistance there. Much more than rears have. But if your saying you cant make the wheel spin at all, then i would be ripping the calipers off the rotor first, then spin the wheel again just to make sure the wheel actually spins while calipers are off. That will eliminate diff problems.
DONT TAKE SHORT CUTS WHEN OVERHAULING CALPIPERS !!....Do them right first time and they will serve you well for a long time to come. Make sure you use the proper grease in the slides too.
Ange

Troy,

There is another possible cause of your brake drag and it is dead simple to fix.

Is the master cylinder over full? There is a max line for a reason.

When we did the Cape York trip I had a problem that the car seemed to get slower the longer we drove. Stop for a while and eveything was OK couple of hours driving and she is slowing down again. One day I'm driving along with the window down rather than the A/C on and I can smell the brakes. Hhhhmmm! I thinks to myself. Pull up to check things out and the front discs are as hot as ... you know.

I popped the bonnet and checked the master cylinder. I could not see the level of the fluid so lifted the cap and fluid spilled out under pressure. It seems that as we were travelling the small amount of drag on the brakes that is there inherently was heating the brake system and causing the fluid to expand. When it filled the master cylinder it started to apply the brakes. I drained a bit of fluid and the problem was solved. That night in camp I checked the level in the master cylinder while everything was cool and it was still above the max line I drained it to the correct level and never had the problem again.

The car had been put in for a pre-trip check at a well respected 4x4 workshop. This was another of the things they got wrong.

Duncs