Hi. When I first put my car on the road, I had a problem where the rear brakes would bind more then they should while driving. This seemed to be happening after I had parked up and pulled the handbrake on full. I made adjustments to the handbrake cables and the problem seemed to go away. This has been Ok for well over a year.

Well today I took the car for its MOT and during the brake test (after handbrake check) the rears started to bind again. The MOT inspector said that it wasn’t a handbrake problem because the cables had realised and it must be a hydraulic problem. After leaving the MOT centre I gave it some heavy braking and made the problem worse than ever (I can normally brake as hard as I like) after a couple of miles and some very hot brakes they realised off again. My thoughts of possible causes damaged/crushed brake pipe, debris in pipe causing a blockage or a faulty master cylinder. Or maybe its still hand brake related
Has anyone else encountered this? Got any other ideas what might be the cause please?

Drums or discs? (apologies if it says in your post, i'm on the phone and screen is a bit poxy)

sorry disks

Could be sticking calipers, have they been overhauled? I had the same problem, but with the front brakes, had them re-engineered by "Big Red" and had no further trouble since. HTH Ray

Brought them new/reconditioned

Do you have a twin master cylinder layout with balance bar?
If so, is the rear master cylinder rod fully returning - if it does not then fluid is trapped in the rear circuit and lock the brakes. It gets worse the more you push the brake.

Yes I have a twin master cylinder layout with balance bar.
What makes the rod fully return?is it the pressure in the system?

The rod should return on its own accord - problems are usually due to the rod being adjusted too long or the pivot/slider part of the balance bar being siezed.

Easy to check if the master cylinder rod is overadjusted, just crack off one of the bleed nipples with the car jacked up and brakes binding . If the brake frees off after cracking nipple then the master cylinder is holding pressure so rod to rear cylinder may be too long. If brakes don't free off then let off handbrake adjustment and recheck. If brakes are still binding then the pads may be sticking in the caliper, might be worth taking them out and cleaning , refit with a bit of copper slip . HTH . Mel