My 2009 Hyundai failed its MOT in may 2014, the garage said the car was slipping. I allowed them to investigate and they found cables to have seized up. They replaced these on hyundai warranty. Now in Octoer 2014 and approximately 4000 miles later, warranty expired I am encountering the same problem. On an incline with the handbrake engaged the car slip. Brakes are absolutely fine. They have found fault with the rear callipers and would like £750 to change them with genuine Hyundai parts.

I have raised the issue that I suspect that in May 2014 the garage did not fully correct the problem and I should not have to pay, they are offering me a 15% discount.

Can you please advice. Am I fighting a loosing battle, are there any presidents or specific terminology that will get the garage to take my case more seriously.

Any associated technical advice you can give would be greatly appreciated.