Swinborg

Dear All, I have just taken possession a 2006 in white! I have noticed a wobble in the steering wheel which conicides with a squeak from the front brakes. From this I am assuming the rotors are baked and warped. (Had tyre and wheel balance checked - all good) after looking online I have found the front disc to be 275mm and the rears 296mm is this right???? Rear discs bigger than front??? oh any recommends for make and manufacturer of discs and pads