Ford Puma 1.7 - Handbrake Problem - Kildrummy

I have a problem with the handbrake on my Puma i.e. it will not hold on both rear wheels.

I have changed the brake shoes and free'd off the adjusters. I have changed the brake cables and adjusted the handbrake but it still will not hold equally on both wheels. One wheel holds better than the other but on a hill it will not safely hold the car.

Any thoughts suggestions are very welcome

Thanks

Don