EBC Brakes for the Mazda RX8: Which Parts Fit

By Core Brake Parts Tech Team — Circleville, OH warehouse

EBC makes front and rear brake parts for the 2003-2012 Mazda RX-8, and the ones we carry are the USR slotted rotors, Yellowstuff front pads and Bluestuff NDX rear pads. The catch on this car is that the RX-8 was built with more than one front brake size, so the part has to match your car's suspension package, not just the year. Get that right and EBC's street-oriented compounds are a sensible step up from stock for a car that likes to be driven hard.

How the RX-8 brake system is laid out

Every RX-8 uses four-wheel disc brakes with vented rotors at both ends. Mazda's own 2011 RX-8 specification sheet lists a 12.7-inch vented front disc, an 11.9-inch vented rear disc with aluminum calipers, and 4-wheel, 4-channel ABS with Electronic Brakeforce Distribution (EBD) on all three trims (Sport, Grand Touring and R3). There are no drums anywhere on this car, and the parking brake is a conventional hand lever rather than an electronic switch.

Earlier cars are where fitment gets tricky. RX-8s were sold with a "standard" suspension front brake and a larger "sport" suspension front brake. Rotary specialist Mazdatrix lists the OEM standard-suspension front rotor at 11 7/8 inches, which is noticeably smaller than the 12.7-inch front rotor Mazda specified for 2011. A rotor or pad built for one will not fit the caliper and bracket of the other. That is why the EBC listings below each carry a suspension note in the title.

Which EBC parts fit the RX-8

These are the EBC parts we currently stock for the RX-8. Read the suspension and year notes in each listing before you order.

Notice that the front rotor we list is the sports-suspension part while the front Yellowstuff pad is listed for standard suspension. Those two are not a matched pair for the same car. If your RX-8 has the sport front brake, pick the USR7171 rotor and a pad listed for that front caliper; if it has the standard front brake, the DP41665R pad is the one to look at. When in doubt, measure the old front rotor's diameter before ordering and compare it to the sizes above.

We also carry Hawk pads for the RX-8 if you want a different friction feel, such as the Hawk HPS front pad set for 2004-2009 and the Hawk HPS street rear pad set for 2003-2007. You can browse everything else in our brake pads collection and brake rotors collection.

Yellowstuff vs Bluestuff NDX: what the compounds do

EBC describes Yellowstuff as an aramid-fibre compound built for fast street driving, with a green fade threshold of 400 C (750 F). It is ECE brake-safety tested, which EBC says means it must work properly from cold, and it has strong cold bite. EBC reformulated it in 2021 to remove copper. Two honest trade-offs from EBC itself: these are not low-dust pads, and they need a longer bedding period. EBC says bedding happens naturally over the first 100 to 200 miles of urban driving. The pads come shimmed, slotted and chamfered with a Brake-In coating to speed that up.

Bluestuff NDX sits a step higher. EBC rates it as a premium fast-street pad and an entry-level trackday pad, effective up to 550 C (1000 F), with a similar friction profile to Yellowstuff but a higher friction coefficient and a much faster bed-in. EBC also describes its dust as low, similar to its Redstuff range. For a street RX-8, either works; if the car sees autocross or occasional lapping days, the higher heat range of Bluestuff is the reason to choose it. EBC is clear that Yellowstuff is not meant for dedicated track use.

What the USR slotted rotors change

EBC's USR rotors are cut from G3000 grey iron blanks and use a narrow, multi-slot pattern machined at a progressive angle. The finer slots are meant to clear gas, dirt and water from the pad face while staying quieter than wide-slot designs. EBC says the main benefit of slotting is that it promotes flat, parallel pad wear, and that the rotors work best paired with its higher-friction pads such as Yellowstuff. In other words, the rotor is part of a matched system rather than a standalone upgrade.

Slotted rotors do not change your rotor size or your caliper, so they bolt on exactly where the factory rotor sat, as long as the part number matches your suspension package.

Signs your RX-8 is due for brakes

• Pedal pulsation under braking: usually uneven pad deposits or thickness variation in the rotor. Replacing rotors with fresh pads cures it; pads alone often do not.
• Squeal or grinding: a squeal can be the wear indicator; grinding means the backing plate is near or on the rotor and the rotor is likely damaged.
• Longer stops or a softer pedal after hard driving: this is fade, where the pad has gone past its working temperature. It is the clearest sign a street compound is being asked to do track work.
• Rotor wear: measure the rotor and compare it to the minimum thickness stamped on the rotor or listed in the factory service manual. If it is at or under that figure, replace it.

What to replace at the same time, and how hard the job is

Replace pads and rotors as axle sets, both fronts or both rears, so the car brakes evenly. New slotted rotors and new pads should be bedded in together. Clean and lubricate the caliper slide pins and pad contact points, check the flexible hoses for cracks, and inspect the fluid; if it is dark or overdue, a flush with the fluid type named on your master cylinder cap is cheap insurance. If you want new clips and pins, see our brake hardware kits.

On difficulty, a pad-and-rotor job on the RX-8 is a normal home-garage job for someone with a jack, stands, a torque wrench and basic hand tools. Torque the caliper bracket bolts, caliper bolts and wheel nuts to the values in the factory service manual rather than guessing. After the job, pump the pedal until it is firm before moving the car, then bed the brakes. EBC's street procedure for Bluestuff NDX is a series of stops from 70 mph down to 20 mph, a cool-down, then a second series from 80 mph to 20 mph, done somewhere safe and legal.

Frequently Asked Questions

How do I know if my RX-8 has the standard or sport front brakes?

The quickest check is to measure the front rotor diameter. Mazdatrix lists the standard-suspension front rotor at 11 7/8 inches, while Mazda specified a 12.7-inch front rotor for the 2011 model. Match the part to what is on the car.

Can I use Yellowstuff pads on the track?

EBC calls Yellowstuff a fast-street pad and points drivers to Bluestuff or its dedicated race compounds for track use. For lapping days, Bluestuff NDX is the better fit.

Do EBC Yellowstuff pads make a lot of dust?

Yes. EBC states plainly that Yellowstuff is not a low-dust pad. Bluestuff NDX is described as lower dust, similar to EBC's Redstuff.

Do I need new rotors with new EBC pads?

If your rotors are below minimum thickness, warped or grooved, yes. Even when they are within spec, fresh rotors give new pads a clean surface to bed into, which is why pads and rotors are usually replaced together.

Are the rear brakes on the RX-8 discs or drums?

Discs. Mazda's specification lists vented rear discs with aluminum calipers on the RX-8.

Sources

1. Mazda USA 2011 RX-8 specifications - 12.7-inch vented front disc, 11.9-inch vented rear disc with aluminum calipers, 4-channel ABS with EBD
2. Mazdatrix RX-8 front rotor, normal suspension - 11 7/8 inch standard-suspension front rotor
3. EBC Yellowstuff Fast Street Brake Pads - compound, 400 C fade threshold, dust, bedding period, 2021 copper-free reformulation
4. EBC Bluestuff NDX Brake Pads - 550 C rating, trackday use, dust, bedding procedure
5. EBC USR Slotted Brake Rotors - G3000 iron, slot design, pairing with Yellowstuff