www.jec.org.uk

Can anyone tell me the original disc thickness of rear x351 discs and the recommended thickness replacement. Pads are 4.5 mm

Doug - it is very common for the minimum thickness to be stamped on the outer rim of the brake disc. I know that's not your question but at least you will know if you're on the limit.

I have done a very quick bit of research on 351 brake discs.

Essentially it would appear that most of the 06 onwards X350 braking gear found its way onto the X351. The car was indeed based on the outgoing X350 and tried and tested parts found their way to the X351. Not an uncommon practice w ith motor manufacture.

A very quick look at the attached link found typical X350 355mm discs on the front and an even more typical new unworn disc cross section of 32mm. My own experience with such discs found the minimum disc cross section after use with mileage accumulated to be 28mm afterwhich the discs should be regarded as worn out. Regardless of disc diameter which will inevitably differ from model to model, the starting cross sectional area is usually 32mm.

Hope that helps.
https://www.google.co.uk/url?sa=t&rct=j ... 4lzsOyu3Ww

Mike K

Thanks guys for your response and help. Much appreciated. Doug