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1979-90 Maserati Quattriporte used the same calipers too. Basically the same IRS, but with vented disk brakes. The cage mount is slightly different, so not a bolt in to a Jaguar.
So is that an upgrade that is possible to the XJS?
Maybe, with some work. You would be better doing the brake conversion from Rob Beere, it looks like basically the same thing. The Maserati does have some strengthening of the cage in strategic places and a different wishbone. The hub carriers are also stronger. However, the wheels of the Maserati are a different bolt circle, so not directly useable for the Jaguar. I'm sure a Maserati rear could be put under a Jaguar, you would need to weld on the Jaguar ends of the cage to mount to the body.
Interestingly, the handbrake action on disc brakes has always been problematic. Only solved after many years by incorporating a drum and shoes for the handbrake into the disc, or, more recently, by having an electrically operated caliper onto the disc, which overcomes the adjustment problem.
I think this Girling solution which was used from the late 1950s through, we now learn, to Toyota in at least 2000, was the best that could be thought of until drums etc were used. This same handbrake system was used on my Alvis TD21 made in 1959, with outboard rear discs (incidentally the first production car to be marketed with discs all round). The adjustment screw (operated on our cars by the semi effective auto adjuster) was on the outside side, and the service procedure (every 1,000 miles) was to turn the screw, accessible through the spokes of the wire wheels, to tighten up the pads closer to the disc, which of course would be impossible with inboard brakes.
Parking brake chuckle
