2020-2022 Toyota GR Yaris Brake Upgrade Options

By Core Brake Parts Tech Team — Circleville, OH warehouse

The GR Yaris already leaves the factory with serious brakes: 356 mm ventilated front discs clamped by four-piston aluminium calipers, and 297 mm ventilated rear discs with two-piston aluminium calipers. For most owners the best upgrade is not a bigger caliper but better friction material, fresh high-boiling-point fluid, and, for regular track use, a two-piece front rotor that sheds heat and unsprung weight. This guide walks through each option in the order that gives the most return for the money.

What the GR Yaris Brakes Look Like from the Factory

Toyota built the GR Yaris as a road car developed from its World Rally Championship program, and the brake package reflects that. According to Toyota Europe, the front uses 356 mm ventilated discs with four-pot lightweight aluminium calipers, the rear uses 297 mm ventilated discs with two-pot aluminium calipers, and high-friction pads are fitted at both ends. Toyota also states the system's heat capacity is suitable for circuit driving, with performance closer to that of heavier, more powerful C-segment cars, and that the pedal was given a short stroke tuned for solid feedback.

Two other details matter when you plan upgrades. First, the car has a mechanical, hand-operated parking brake that Toyota says the driver can use for cornering in rally stage driving, so the rear pads also serve the handbrake. Second, the GR-FOUR all-wheel-drive system can split torque 60:40, 50:50 or 30:70 front to rear depending on mode, which means the rear axle does more work than on a typical front-driver. Toyota quotes a kerb weight of 1,280 kg. In Japan, Toyota also offered a rally-oriented RC grade with 16-inch ventilated discs sized for small-diameter rally tires, so confirm which grade and brake size you have before ordering anything.

Upgrade 1: Brake Pads Matched to How You Drive

Pads are the cheapest, fastest change and the one you will feel most. The right compound depends on where the car spends its time, because a pad that works on track at high temperature can be noisy, dusty and weak when cold on the street, and a street pad can fade on a hot track session.

• Fast road driving: a performance street pad with strong cold bite, such as the EBC Yellowstuff rear pad set for the GR Yaris.
• Street plus occasional track days: a dual-purpose compound built for both, such as the EBC Bluestuff NDX street and track day rear pads.
• Dedicated track or race car: a race-only compound like the EBC Racing RP-1 rear race pad set. Race pads need heat to work and are not a good choice for a daily driver.

Keep front and rear compounds in the same family. Mixing a race pad on one axle with a mild street pad on the other changes brake balance, and on an all-wheel-drive car with a strong rear torque bias that can make the car feel unsettled under hard braking. Browse our performance brake pads for matching front sets. Because the rear pads also work with the mechanical handbrake, check handbrake adjustment and hold after any rear pad change.

Upgrade 2: High-Temperature Brake Fluid

Brake fade on track is often fluid, not pads. When fluid boils in the caliper it forms vapor, and the pedal goes long or soft. Federal Motor Vehicle Safety Standard 116 sets minimum boiling points: DOT 3 must reach at least 205 C (401 F) dry and 140 C (284 F) wet, while DOT 4 must reach at least 230 C (446 F) dry and 155 C (311 F) wet. The "wet" figure matters because glycol fluids absorb moisture over time, so old fluid boils sooner than new fluid.

Use the fluid type printed on your reservoir cap and in the owner's manual, and never mix silicone DOT 5 into a glycol system. For track days, a high-boiling fluid in the correct DOT class plus a full flush before the event is one of the most effective changes you can make. Upgraded stainless brake lines are a sensible add-on at the same time, since you are bleeding the system anyway and braided lines reduce hose expansion for a firmer pedal.

Upgrade 3: Two-Piece Front Rotors

The front axle does most of the braking, and the stock 356 mm size is already large, so the rotor upgrade here is about construction, not diameter. The DBA 5000 Series T3 slotted two-piece front rotor for the GR Yaris keeps the factory 356 mm by 28 mm dimensions, so it works with the stock calipers and pads.

DBA builds its 5000 Series from high-carbon cast-iron rings bolted to aerospace-grade T6061-T6 aluminium hats with NAS bolts and crimp nuts. DBA says the aluminium hat reduces unsprung weight, lets the iron ring expand evenly as it heats, and cuts heat transfer from the disc into the hub. The T3 slot pattern adds exit paths for pad gases and dust, and DBA's Kangaroo Paw vane design is claimed to improve heat dissipation. When the iron ring wears out, DBA sells replacement rings so the hats can be reused after inspection.

For street-only cars a quality one-piece rotor from our brake rotor range is plenty. The two-piece rotor earns its cost on cars that see repeated hard stops from high speed.

What to Replace at the Same Time

• Pads with rotors: always fit new pads with new rotors and bed them in together so a fresh, even transfer layer forms.
• Fluid: flush after any caliper or line work, and before every track event.
• Hardware: replace worn pad clips and pins with a brake hardware kit so the new pads slide freely.
• Handbrake check: after rear work, confirm the mechanical handbrake holds the car and releases fully.

How Hard Is the Job?

A pad swap on the GR Yaris is a straightforward DIY job for someone with jack stands, a torque wrench and basic hand tools: the calipers stay on the car and the pads come out once the retaining hardware is removed. Rotor replacement requires removing the caliper and its mounting to pull the disc. Torque every fastener to the values in the factory service manual rather than guessing, and for two-piece rotors follow the maker's instructions for the hat-to-ring bolts. A fluid flush needs a helper or a pressure bleeder. If you are not comfortable bleeding a system with ABS, have a shop do the fluid work.

Frequently Asked Questions

Do I need a big brake kit on a GR Yaris?

For most owners, no. Toyota fitted 356 mm front discs with four-piston calipers and says the system has heat capacity suitable for circuit driving. Pads, fluid and two-piece rotors solve most fade complaints before a larger caliper is needed.

Will the DBA two-piece rotor fit my stock calipers?

Yes. DBA lists it at 356 mm by 28 mm, the same size as the factory front disc, so it is a direct replacement on cars with the standard front brake.

Can I run race pads on the street?

It is not recommended. Race compounds are designed to work at high temperature and can feel weak, noisy and dusty when cold. Choose a street or street-and-track compound for a car you drive daily.

Which brake fluid should I use?

Use the DOT class shown on the reservoir cap and in the owner's manual. For track use pick a high-boiling fluid in that class and flush it before each event, since absorbed moisture lowers the boiling point.

Why upgrade the rear pads on an all-wheel-drive hatchback?

The GR-FOUR system can send up to 70 percent of torque to the rear, and the mechanical handbrake uses the rear brakes, so the rear axle works harder than on a typical small car. Matching rear pads to the front keeps brake balance predictable.

Sources

1. Toyota Europe Newsroom - GR Yaris: Born from the World Rally Championship - factory disc sizes, caliper types, high-friction pads, heat capacity, pedal tuning, mechanical handbrake, GR-FOUR torque split, kerb weight
2. Toyota Global Newsroom - GR Yaris Japan launch - 2020 launch, WRC development, RC grade 16-inch ventilated discs
3. DBA - 5000 Series Brake Rotors - two-piece construction, aluminium hats, T3 slots, Kangaroo Paw vanes, replacement rings
4. DBA - Front 5000 Series T3 Brake Rotor DBA53922BLKS - diameter, thickness, minimum thickness, bolt pattern, centre bore
5. 49 CFR 571.116 (FMVSS 116), Cornell LII - DOT 3 and DOT 4 minimum dry and wet boiling points