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Big Brake Kit

XYZ Racing Hollow Rear Brake Kit — Mercedes Benz GLA AMG 45 4WD X156 (2014-2020)

SKU: XYZ-BRK-BKR-ME-080-A-REAR

  • IncludesRear axle pair (2 discs + 2 calipers)
  • PositionRear
  • Disc Ø356–421 mm
  • Caliper pots6 / 8-pot
  • Lead time10–15 working days

Fits Mercedes Benz GLA AMG 45 4WD X156 (2014-2020)

Brake pad compound

Street: quiet, low-dust, strong cold bite for road driving. Sport: higher temperature range and more bite for fast road and occasional track. Racing: maximum fade resistance for sustained track use (noisier and dustier cold). Match the pad to how hard you actually brake.

Disc size

Caliper grade

Hollow is the standard caliper: a lighter hollow-body forged caliper with a dust cover and a 5-year warranty. Hollow Racing drops the dust cover for sustained high-temperature use (rated to 1000°C, 2-year warranty) — the track-grade choice.

Caliper colour

Painted colours are included. Polished-forged finishes are mirror-polished forged calipers (Titanium, Gold, Silver); candy colours are a deep, mirror-reflection paint. Both are premium upgrades — fuller detail further down the page.

Painted — includedTell us the exact Pantone (PMS) code you want the calipers painted.Polished forgedCandy
Disc style

Drilled discs (cross-drilled holes) vent gas and water and look aggressive; slotted discs (surface grooves) wipe the pad face clean and resist fade under sustained hard use. Same price — choose on looks or how you drive.

Centre bell

The centre bell is the CNC-machined aluminium hat that joins the disc to the hub. Standard anodized is included; a two-tone bell adds an anodized accent ring in your choice of colour; titanium is the lightest, forged option.

Carbon-ceramic rotor

Carbon-ceramic rotors are a special-order track upgrade: far lighter than steel, fade-resistant at extreme temperatures and extremely long-lived. The price follows the disc size you choose above. The standard two-piece steel rotor is included.

Configured price£3,000.00Inc. VAT

Lead time: 10–15 working days from payment


£3,000.00

Made to order. Full payment is taken at checkout. Production begins once payment is confirmed.

Pay by card, Apple Pay, Google Pay — or Klarna on eligible orders.

Caliper render for this kit:

XYZ Racing Hollow Rear Brake Kit — Mercedes Benz GLA AMG 45 4WD X156 (2014-2020) — 356 mm
356 mm

The X156 GLA 45’s M133 turbo four drives all four wheels, and on a 4MATIC car the rear axle does far more work than the raised-crossover silhouette suggests. The XYZ Racing Rear Big Brake Kit for the Mercedes Benz GLA AMG 45 4WD X156 (2014-2020) attacks the rear-end heat soak that creeps in over a run of hard stops, when a heavy hot-hatch-on-stilts keeps asking its standard rear discs for more than they were sized to give.

This is a rear big brake kit built for fast-road and circuit use, pairing a two-piece floating disc with an uprated caliper to add thermal headroom and bite where the factory rear setup runs short. It is a matched pair for the back axle: two calipers, two discs and pads. You match the pad compound to how you actually drive and choose the caliper finish to suit the car.

What this rear brake kit does for your 2014-2020 Mercedes Benz GLA AMG 45 4WD X156

On the road you get firmer, more confident rear bite and a pedal that holds its travel once the discs are hot. The hollow-vane disc construction trims rotational and unsprung mass at the rear axle, which helps the GLA 45’s 4MATIC chassis settle faster over broken surfaces and under trail braking into a corner. Step up to the Racing compound and the kit absorbs the repeated heavy stops of a track session, where the standard rears begin to fade and lengthen the pedal. The Sport compound adds bite and heat range for fast road and the occasional track day, while Street keeps cold bite quiet and low-dust for daily duty. Because the back axle keeps its share of the work, front-and-rear balance stays composed rather than tipping all the effort onto the nose.

About the rear big brake kit

The XYZ Racing rear big brake kit is a direct bolt-on upgrade built around the X156’s rear hubs. It uses two-piece floating discs that strip rotating mass from each corner without sacrificing the swept area and internal venting needed to shed heat; the rings can be drilled or slotted at the same price. The kit comes with a choice of three pad compounds: Street for quiet, low-dust road use, Sport for more bite and a wider heat range on fast roads, and Racing for circuit work, so the same hardware suits a daily-driven GLA 45 or a weekend track car. The caliper is hollow-bodied as standard, with an optional Hollow Racing upgrade (no dust cover, rated to 1000C, two-year warranty) for serious track use. Painted finishes come at no cost in Red, Yellow, Gold, Black or Anodized Black, with a Custom Color in any Pantone for GBP 150 more; polished-forged finishes (Titanium, Polished Gold, Polished Silver) and candy finishes (Candy Teal, Candy Blue, Candy Red, Candy Orange) are also offered, alongside two-tone or titanium centre bells. Every part is matched to the rear axle of the four-wheel-drive GLA 45 rather than adapted from another platform.

Fitment for the Mercedes Benz GLA AMG 45 4WD X156 (2014-2020)

This kit fits the Mercedes Benz GLA AMG 45 4WD X156 built from 2014 to 2020: the 4MATIC, M133-powered hot crossover, not the lesser GLA variants. It is a rear-axle kit, designed to run alongside a front big brake setup or as a standalone rear upgrade. Confirm your chassis code reads X156 and that your car is the AMG 45 4WD model before you order.

What buyers also search for

  • Mercedes Benz GLA AMG 45 X156 rear big brake kit for road and track
  • GLA 45 4MATIC brake upgrade with Street, Sport and Racing pad options
  • X156 GLA 45 two-piece floating disc rear brakes to hold off fade on track days
  • Mercedes GLA 45 caliper colour choices including Red, Black, Gold and Custom
  • Lightweight rear brake kit for the 2014-2020 Mercedes Benz GLA AMG 45

Pick your pad compound and caliper colour for the GLA 45 X156 and build your rear brake kit using the options above.

What’s in the kit

Rear axle kit — supplied as a complete bolt-on assembly.

  • 2×Two-piece floating discs — 356–421 mm: you pick the exact diameter with the "Disc size" option
  • 2×Lightweight aluminium centre bells
  • 2×Forged aluminium calipers — 6 / 8-pot
  • 2×High-stiffness mounting brackets
  • 2×Braided stainless steel brake lines
  • 4×High-performance brake pads (1 set)
  • 1×Fitting hardware & tools pack

Parking brake: Electronic parking brake (EPB) compatible.

Choosing your spec

Every kit is built to order around the choices you make above. Here is what each option actually changes, so you can spec yours with confidence.

Brake pads — Street, Sport or Racing

Every kit ships with a full set of high-performance pads; the compound is your call.

Street is the right default for fast-road driving — a strong, progressive cold bite with low noise, low dust and long disc life. Sport raises the working temperature and adds bite and fade resistance for hard road use and the occasional track day, while still behaving on a cold morning. Racing is a track compound built for sustained abuse: huge fade resistance and bite once heat is in it, at the cost of more noise and dust when cold. Match the pad to how hard you actually use the brakes — there is no benefit to a race pad that never gets up to temperature.

Caliper grade — Hollow vs Hollow Racing

Hollow is the standard caliper on every kit: a hollow-body forged caliper, lighter than a solid one, fitted with a dust cover and backed by a 5-year oil-leak warranty. For most fast-road and spirited track use it is all the caliper you need.

Hollow Racing is the track-grade upgrade. It runs the same hollow body but without a dust cover (so there is nothing to melt at sustained high temperature), uses a twin-metal piston that isolates heat travelling from the disc to the oil seal, and is rated to 1000°C. Available 330–356mm (rear). Warranty is 2 years on oil leaks and 10 years on appearance. Built for professional racing and repeated track days.

Hollow Racing caliper

Caliper colour & finish

Painted colours (Red, Yellow, Gold, Black, Anodized Black) are included at no cost. Want an exact match to your car? Custom Color (+£150) paints the calipers to any Pantone code you supply (15–20 day lead time).

Polished Forged finishes are the flagship: a forged caliper given a mirror-polished surface treatment that shifts colour with the viewing angle. Beyond the looks, the polished surface dissipates heat better, resists rust and stands up to the weather. Choose Titanium (neochrome, +£350), Polished Gold (+£300) or Polished Silver (+£250). They look their best paired with a titanium centre bell. Care: clean only with a dilute neutral cleaner or water.

Candy colours (+£200) use a deep candy-paint and polishing process for a mirror-reflection, boutique finish — pick Teal, Blue, Red or Orange (shown below right).

Polished forged caliper finishes
Candy caliper colours

Centre bells

The centre bell is the CNC-machined aluminium hat that joins the disc to the hub. The standard anodized centre bell is included. The Two-tone bell (+£200) adds an anodized accent ring — choose Red, Yellow, Orange, Purple or Silver right here at checkout. The Titanium centre bell (+£500) is a forged titanium bell (bolts not included) that finishes off the polished-forged look.

Two-tone anodized centre bells
Same car

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