I need help.. I booked my 172 cup in for mot at the start of the month which it failed. the guy said it was an imbalance with the foot brake on the rear brakes. so that weekend I looked at them to see what was happening. The disks looked as if they where on there way out to went to renault and got nice new disks and pads.I also replaced the brake fluid and tryed to free up the caliper piston and it seemed to wind in and out freely so i rebooked my car for a few days later Failed again for the same thing so I thought the drivers rear caliper must be f**ked replaced and reblead brakes and rebooked Failed again for the same thing I'm starting to run out of idea's I know about the 172 cups having low braking effort but they said they are out of ballance I have only owned this car for 3 months and love it but this is starting to f**k me right off what do you think?