When should brake discs be replaced?

When discs reach the manufacturer's minimum thickness, are scored, lipped, warped, or cracked — typically every 2–3 sets of pads.

Here's a quick, honest answer from a working UK mechanic — what causes it, what it costs to fix, and what to do next.

Should I always replace pads with discs? — Yes — old pads on new discs glaze quickly and cause judder.

Will scored discs fail MOT? — Only if heavily scored or cracked. Minor scoring is normal.

Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].