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Could you run these without touching the fronts or would it upset the balance?
We would recommend installing these with the front big disc upgrade to retain the brake bias.
Would mk1 1.6 calipers work?
These need to be fitted to 1.8 carriers.
what bolts do I need to fit these to the car
We supply a set of M10x1.25 bolts to mount the adaptors, your existing bolts are also reused
Will these fit under 14" wheels?
You will need an extra 12.5mm on the radius for the 1.8 251mm rear discs or 22mm extra for the 1.6 231mm rear discs.
Do you use the standard size pads or can you fit the mk2.5 sport pads?
The kit utilises the standard 1.8 calipers and carriers, so no need to change the pads. There's also a wider selection of pads available for the standard calipers than the Mk2.5 Sport pads.
Do I need other brake lines than the standard ones for the 231/251 mm rear discs?
These rear adaptors will work with standard length rear hoses.