XJS Big Brake Kit

The calipers are similar in size but its the weight saving that is so noticeable, the Girling caliper is cast iron against the aluminium of the Compbrake , and it’s designed to take a far larger disc.Also to anyone who has struggled to fit the steering arm shim when re fitting the original type caliper will appreciate how easy it now is with the separate caliper mounting bracket .

Hi, all the details are on the Compbrake website, the kit I went for was the ‘smaller’ 330 mm diameter disc kit(£1199 plus vat) and all OE XJS 16 inch wheels will fit.
What appealed to me was the 5kilos per side unsprung weight saving and the heat dissipation provided by the aluminium calipers , bells and the directional cooling vanes in the discs. I reckon all of my brake issues in the 40 years plus of running v12’s have been caused by heat, either warping discs, perished seals , boiling brake fluid etc. Albeit that was many years ago when you could use the v12 to its maximum in France without fear of getting your car impounded and a spot of porridge!
As an added bonus with this kit fitting the steering arm to caliper shim is a piece of cake, I think in the past a lot of mechanics have fiddled for ages trying to refit the shim only to give up and just bolt the arm straight up, judging by the number of XJ’s I have seen were it’s missing.
Regarding the rears, I have a set of vented inboard discs and modified calipers so will be keeping that set up for the moment but Compbrake have said they could probably supply a suitable rear caliper in Aluminium if I supply them with a set, only issue would be the handbrake set up.