2011-2015 Scion IQ Brake Upgrade Options

By Core Brake Parts Tech Team — Circleville, OH warehouse

The best brake upgrade for most 2011-2015 Scion iQ owners is a better front pad compound, not a bigger brake system. The iQ is a very light car with front discs and rear drums, and a street performance pad such as EBC Yellowstuff or a low-dust ceramic like EBC Redstuff changes pedal feel and bite more than any other single part. Big brake kits exist, but they are a lot of hardware for a 1.3L city car.

How the Scion iQ Brake System Is Laid Out

The US-market iQ uses disc brakes on the front axle and drum brakes on the rear. Toyota's genuine parts catalog lists a rear brake drum, part number 42431-74010, for the Scion iQ, which confirms the drum rear on North American cars. That matters for an upgrade plan: the front brakes do most of the stopping work, especially in a short-wheelbase car that pitches forward under braking, so the front pads are where an upgrade actually shows up in the pedal.

The rear drums still need attention at service time. Shoes, springs and the self-adjuster keep the rear brakes doing their share, and a poorly adjusted drum can make the parking brake lever travel high and leave the front pads carrying even more of the load. Replacement shoes are in our brake shoes collection.

Upgrade Option 1: EBC Yellowstuff Street Performance Pads

Yellowstuff is EBC's street performance compound. EBC describes it as having an extremely low metal content, excellent cold bite and zero brake noise, and says it will not eat through rotors the way many performance pads do. It is ECE R90 approved for road use, and EBC's own direct store rates it stable up to 400C (750F), which it calls the normal street maximum.

For the iQ that means a noticeably firmer initial bite on spirited drives and on long downhill runs, where a small car with small brakes can otherwise start to feel soft. There are trade-offs: Yellowstuff is rated medium for dust (EBC says it wipes off painted wheels with a damp cloth), and full bedding may take 300 to 500 miles depending on rotor condition. EBC also no longer recommends Yellowstuff for track use on most cars because of that long bed-in, and points track drivers to Bluestuff instead.

The fitted part for this car is EBC Yellowstuff front brake pads DP41295R for the 2011-2015 Scion iQ 1.3L.

Upgrade Option 2: EBC Redstuff Low-Dust Ceramic Pads

If your complaint is dusty wheels or a vague pedal on the daily commute rather than fade on hard drives, Redstuff is the better match. EBC builds it from an aramid fibre base enhanced with ceramic particles. It is copper-free and contains no steel fiber, which EBC points to as the main cause of brake dust and fast rotor wear. EBC rates its dust as low and its cold bite as good, and positions it for fast street driving, not racing.

Be patient after installation. EBC says Redstuff bed-in can take as long as 1,000 miles while the pad takes up the shape of the rotor. Braking is normal from the first stop, but the pedal keeps improving as the pad beds. The fitted part is EBC Redstuff ceramic low-dust front brake pad set DP31295C for the 2011-2015 Scion iQ 1.3L. You can compare other options in our ceramic brake pads collection.

Yellowstuff vs Redstuff for the Scion iQ

What About a Big Brake Kit?

Aftermarket big brake kits are listed for the iQ. KSport, for example, catalogs multi-piston caliper kits for the car with rotors starting at 11.3 inches and going much larger. For a dedicated track or show build that can make sense, but for a street iQ it adds cost, unsprung weight and wheel-clearance questions, and the car's light weight means the stock-size front brake is rarely the limit on the street. A kit also changes front-to-rear brake balance on a car whose rear drums stay the same.

For most owners the order of operations is: good front pads, fresh or resurfaced rotors, fresh fluid, and a properly adjusted rear drum. Do that first and then judge whether you still want more. Replacement rotors are in our brake rotors collection.

What to Do at the Same Time

• Rotors: new performance pads need a true, clean rotor surface to bed properly. Replace or machine rotors that are below the minimum thickness cast on the rotor or that show grooves or a lip.
• Brake fluid: use the fluid grade printed on the master cylinder reservoir cap and in the owner's manual. EBC warns that adding the wrong fluid can cause many problems. If you drive hard, fluid boiling point matters: EBC lists its standard DOT 4 at 270C dry and 170C wet, and its DOT 5.1 at 269C dry and 184C wet. Only move to a higher grade if it is compatible with the grade your car specifies.
• Hardware: clean and lubricate the caliper slide pins and replace worn abutment clips. See our brake hardware kits.
• Rear drums: check shoe lining, wheel cylinder seepage and the adjuster while the car is in the air.

How Hard Is the Job?

A front pad swap on the iQ is a straightforward driveway job for someone with basic tools: lift and support the car, remove the wheel, remove the caliper guide bolts, lift the caliper off, swap pads and clips, retract the piston, and reassemble. Torque caliper bolts and lug nuts to the values in the factory service manual. Pump the brake pedal several times before moving the car, then follow the bedding procedure for the pad you chose.

Recall history is clean on the brake side. NHTSA's recall database shows one campaign for 2012-2013 iQ models, 12V528000, which covers the passenger airbag occupant classification cable, not the brakes. That means brake complaints on an iQ are almost always ordinary wear items: pads, rotors, fluid and rear shoe adjustment.

Frequently Asked Questions

Does the Scion iQ have rear disc brakes?

Not in the US. North American iQ models use rear drum brakes, confirmed by the genuine rear brake drum Toyota lists for the car. Upgrades focus on the front discs.

Which is better for a daily-driven iQ, Yellowstuff or Redstuff?

For commuting and clean wheels, Redstuff. For more bite and heat tolerance on spirited drives, Yellowstuff, accepting more dust.

Do I need new rotors with performance pads?

If the rotors are grooved, lipped or below minimum thickness, yes. A fresh or freshly machined surface helps any new pad bed evenly.

Why does my new pad feel soft for the first few days?

The pad is still bedding to the rotor. Full bedding for Yellowstuff may take 300 to 500 miles, and EBC says Redstuff can take up to 1,000 miles.

Is a big brake kit worth it on a Scion iQ?

For street use, rarely. Kits exist, but pads, rotors and fluid usually deliver the improvement a street iQ needs with far less complexity.

Sources

1. EBC Brakes - Yellowstuff Pad and Line Kit - Yellowstuff low metal content, cold bite, ECE R90 approval, rotor wear, long bed-in and track guidance
2. EBC Brakes Direct - Yellowstuff 4000 Series - stable to 400C (750F), medium dust rating, 300-500 mile full bedding
3. EBC Brakes - Redstuff Ceramic Brake Pads - ceramic-enhanced aramid compound, copper-free, zero steel fiber, low dust, bed-in up to 1,000 miles, street-only rating
4. EBC Brakes - Street and Racing Brake Fluids - DOT 4 and DOT 5.1 dry and wet boiling points, follow the owner's manual fluid spec
5. Toyota Parts - Scion iQ Rear Brake Drum 42431-74010 - US-market Scion iQ uses a rear drum brake, genuine drum part number
6. NHTSA Recalls - 2012 Scion iQ - only recall on file for 2012-2013 iQ is 12V528000, an airbag occupant classification cable, not the brakes
7. KSport USA - Scion iQ brake applications - aftermarket big brake kits listed for the iQ with rotors from 11.3 inches up