My Leon Cupra 180 is due its MOT next week and looking at the rear brake discs, I think they may need replacing. Could anyone tell me how much I should have roughly left on them to pass an MOT? Was thinking of trying to change them myself -is it difficult?
The MOT doesn't look at the discs or pads, it just tests whether they work or not. So long as your handbrake and footbrake still stop the rear wheels from turning, you will pass the MOT.
Changing discs and pads is relatively easy. The discs themselves are mainly held on by the wheel bolts, and have only a single countersunk screw holding them in place once the wheel is off. However, since this probably hasn't moved since the car was assembled, it might be rusted in. Have an impact screwdriver ready, just in case.
To change pads you will need to wind back the caliper piston down the threaded handbrake rod. You can do this with circlip pliers and a lot of persistance, but you'll be swearing at them by the end of it. Get a windback tool.
Remember to keep an eye on the level in the brake fluid reservoir as you wind the pistons back. You will probably need to take some out - a chicken baster thing (big syringe with a rubber bulb on the end) is good for this.