Name: XYZ Racing Hollow Rear Brake Kit — Toyota SIENTA (XP170) (2016-2026)
Brand: XYZ Racing
SKU: XYZ-BRK-BKR-TO-016-REAR
Price: 2200 GBP
Availability: PreOrder

Caliper render for this kit:

The Sienta XP170 carries its mass high and over the front axle, a tall front-wheel-drive compact MPV that leans on its front brakes for almost all of its stopping work while the rear axle does very little. The XYZ Racing Hollow Rear Brake Kit for the Toyota Sienta (XP170) tackles that imbalance head on, fitting a larger rear setup where the factory specified the bare minimum.

This is a rear-axle upgrade for owners who use the Sienta the way it was designed to be used: full seats, loaded boot, school runs and long descents with the car at its heaviest. Give the rear axle more braking capacity and the front discs stop carrying the entire vehicle alone, which keeps the pedal honest exactly when the car is working hardest.

What this brake kit does for your 2016-2026 Toyota Sienta (XP170)

Fitted to your 2016-2026 Toyota Sienta, the first thing you feel is balance. The rear axle finally contributes real stopping force, so the nose dives less and the body settles flatter as you come off speed. The hollow-vane disc trims rotating and unsprung mass at the rear, sharpening initial pedal bite and helping the rear brakes shed the heat a laden MPV builds in town or down a long hill. Three pad compounds let you match bite and temperature range to how you actually drive: Street for quiet, low-dust road running, Sport for keener fast-road bite with the heat range to cope with the occasional track day, and Racing when the car is worked hard on circuit. The result is a Sienta that stops shorter when full and feels more reassuring under firm braking.

About the Hollow rear brake kit

The XYZ Racing Hollow rear brake kit is a bolt-on package for the back axle, built to restore braking contribution on a front-biased platform like the Sienta. The two-piece floating disc uses a hollow-vane core that cuts rotating and unsprung mass while keeping a vented face for cooling under sustained use. The fixed caliper is hollow-bodied as standard for stiffness without excess weight, and a Hollow Racing upgrade is available for serious track use, dropping the dust cover, rated to 1000C and backed by a two-year warranty. Caliper colour is yours to choose: Red, Yellow, Gold, Black and Anodized Black are included at no extra cost, with premium polished-forged finishes in Titanium, Polished Gold and Polished Silver, candy finishes in Teal, Blue, Red and Orange, or any Pantone you like as a custom colour. Disc faces can be drilled or slotted at the same price, and the centre bell can step up to a two-tone anodized finish in five colours or titanium. It is engineered as the rear complement to a front upgrade, or as a way to rebalance a car that brakes almost entirely from the nose as standard.

Fitment for the Toyota Sienta (XP170) (2016-2026)

This kit is built specifically for the Toyota Sienta on the XP170 chassis, covering model years 2016 through to 2026. It is a rear-position pair, left and right, designed to bolt to the factory rear hubs of the XP170. Confirm your generation and year against the chassis code before ordering.

What buyers also search for

Toyota Sienta XP170 rear brake upgrade for a fully loaded family MPV
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XP170 rear big brake kit with included and premium caliper colours
Toyota Sienta brake kit for repeated stop-start and long-descent driving

Pick your pad compound and caliper colour above and order the kit to suit your Sienta.

What’s in the kit

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

2×Two-piece floating discs — 330–421 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: Retains your original (OE) handbrake.

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.

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).

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.

Position	Rear
Disc diameter	330–421 mm — exact size chosen with the Disc size option
Caliper pots	6 / 8-pot
Part number	BKR-TO-016
Parking brake	Retains your original (OE) handbrake
Lead time	10–15 working days (made to order)
Country of manufacture	Taiwan

Make	Model	Years	Position	Disc Ø
Toyota	SIENTA (XP170)	2016-2026	Rear	330–421 mm

Not your car? Browse all brake kits or use the vehicle picker at the top of the page.

Will these clear my OE wheels?

Disc diameter is shown in Tech specs. Larger discs need more wheel clearance — most big brake kits require 17″+ wheels, some 18″+. Check your wheel size against the disc Ø before ordering.
How long until they ship?

Made-to-order at Cool Bear’s Taiwan facility. Typical lead time is 10–15 working days from full payment, plus UK courier transit.
Do I need to bed the pads in?

Yes — follow the bedding procedure in the supplied installation guide. ~200 km of progressive use builds the pad transfer layer for full bite.

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