XYZ Racing Hollow Rear Brake Kit — Jaguar SOVEREIGN (XJ40) (1986-1994)

The XJ40 is a big, deliberately unhurried luxury saloon, close to 1.8 tonnes of British executive metal riding on independent rear suspension. Stopping that mass repeatedly, from speed, is where the original rear setup starts to feel its age, and where heat becomes the enemy. The XYZ Racing rear brake kit for the Jaguar Sovereign (XJ40) addresses exactly that, replacing the standard rear discs and calipers with a larger, vented pair built to live with high temperatures.

This is rear-axle hardware for owners keeping these 1986-1994 Sovereigns properly usable in 2026, cars that still cover real distance rather than sitting in a collection. Pad compound runs from Street through Sport to a Racing spec, so the same kit suits a gently driven garage example or a Jaguar that gets leaned on harder than its makers ever intended.

What this brake kit does for your 1986-1994 Jaguar Sovereign (XJ40)

On a car this heavy, the gain you feel first is thermal. A larger rear disc with more swept area and venting takes longer to fade, so the pedal stays firm on a long A-road descent or through a sequence of hard stops where the original brakes would go soft and long. Balance improves too: a stronger, more consistent rear contribution helps settle the XJ40 under braking rather than letting the nose dive and the tail go light. Pick the Street compound for quiet cold bite on daily use, the Sport compound for spirited road work, or the Racing compound if the Sovereign sees occasional track or hard fast-road use. The caliper finish is the part you see, but the real change is a rear axle that hauls the car down predictably every time.

About the Hollow rear brake kit

XYZ Racing builds this as a direct rear-axle pair rather than a universal bracket-and-hope fit: a left and right caliper with two-piece floating discs sized to clamp the larger rotors. The hollow-vane disc casting vents heat from under the pad and trims a little unsprung weight at each rear corner. Three pad compounds are offered: Street for close-to-stock feel, Sport for stronger bite at road temperatures, and Racing for sustained high-heat use. The caliper is hollow-body as standard, with an optional Hollow Racing upgrade for hard use that drops the dust cover, is rated to 1000C and carries a two-year warranty. The aim is a kit suited to the heavy, fast Jaguar saloon: more thermal headroom at the rear, a firmer pedal under repeated use, and consistency the original rear brakes lose as they heat up. Calipers come painted at no extra cost in Red, Yellow, Gold, Black or Anodized Black, with a Custom Color in any Pantone for £150 and premium polished-forged (Titanium, Polished Gold, Polished Silver) or candy (Candy Teal, Candy Blue, Candy Red, Candy Orange) finishes. Discs come drilled or slotted at the same price, with two-tone anodized or titanium centre bells selectable at checkout. Everything here is rear-specific, so pair it with the matching front kit if you want a balanced overhaul of the whole car.

Fitment for the Jaguar Sovereign (XJ40) (1986-1994)

This kit is cut specifically for the Jaguar Sovereign on the XJ40 platform, covering the 1986 to 1994 production run, and fits the rear axle only as a pair of calipers and discs. The Sovereign trim spanned the full XJ40 lifespan, so confirm your exact build year before ordering and match the rear hardware to your car.

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Pick your pad compound and caliper colour, check the fitment against your car, and build your XJ40 rear brake kit using the options above when you order.