XYZ Racing Hollow Rear Brake Kit — Alfa Romeo 155 Q4 4WD (1992-1997)

The Alfa Romeo 155 Q4’s permanent four-wheel-drive turbo layout, with a drivetrain borrowed from the Lancia Delta Integrale, put real mass over a chassis that was never given brakes to match. The rear axle in particular does more work than most owners expect on a 4WD saloon under hard trail-braking, and the original equipment fades once you start leaning on it. The XYZ Racing Hollow Rear Brake Kit for the Alfa Romeo 155 Q4 4WD rebuilds that rear corner with two-piece floating discs and pads sized for repeated heavy stops.

This is a rear-axle kit, so it is about balance as much as outright stopping power. Each kit is a pair of left and right rear calipers with matching rear discs. Matched to the right pad compound, it gives a rear end that bites cleanly instead of locking or lagging behind the front. For a car now well past 30 years old, that is the difference between a 155 Q4 you lean on down a B-road and one you nurse.

What this brake kit does for your 1992-1997 Alfa Romeo 155 Q4 4WD

On the road you notice it first as a firmer, more progressive rear pedal. The hollow-vane disc core sheds heat faster than a solid OE rotor and trims rotating mass at the rear axle, so the brakes recover between corners rather than stacking heat through a fast descent. Because the Q4 carries its 4WD hardware low and rearward, a rear axle that hauls down consistently keeps the whole car settled under braking instead of pitching onto its nose.

Pad compound matches the car to how you drive it. Street is the quiet, low-dust road default. Sport adds bite and heat range for spirited road work and the odd track day. Racing is the full track compound for sessions where the rear takes real punishment. Caliper finish comes in the included painted colours Red, Yellow, Gold, Black or Anodized Black, with any Pantone available as a Custom Color, so the upgrade reads as deliberate behind the wheels.

About the Hollow Rear Brake Kit

The Hollow Rear Brake Kit is built around two-piece floating discs with a hollow-vane core, a rotor designed to lose heat and weight where a conventional cast disc cannot. Less mass spinning at the rear axle means quicker thermal recovery and less unsprung weight for the rear suspension to manage. The kit is a rear-specific package: discs, pads and the hardware to mount them to the 155 Q4’s rear corners.

Disc face is drilled or slotted at the same price, and centre bell upgrades, two-tone anodizing in five colours or titanium, are selectable when you order. Pad choice runs across Street, Sport and Racing compounds, so the same disc can serve a daily-driven classic or a car booked in for track work. The caliper is hollow-body as standard, with premium polished-forged Titanium, Polished Gold and Polished Silver and candy Teal, Blue, Red and Orange beyond the included colours. A Hollow Racing caliper, with no dust cover, a 1000C rating and a two-year warranty, is there for serious track use. It is a focused rear upgrade aimed at owners who want the back of the car to keep pace with whatever front setup they run.

Fitment for the Alfa Romeo 155 Q4 4WD (1992-1997)

This kit is cut specifically for the Alfa Romeo 155 Q4 4WD built between 1992 and 1997 – the four-wheel-drive, turbocharged Q4 variant, not the front-drive Twin Spark or V6 cars. It fits the rear axle only. Confirm your car is a genuine Q4 before ordering, as its running gear differs from the rest of the 155 range.

What buyers also search for

• Alfa Romeo 155 Q4 rear brake upgrade for fast road and track use
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• Alfa Romeo 155 Q4 calipers in included and premium finishes

Choose your disc style, pad compound and caliper finish, then build your 155 Q4 rear setup when you order.