2012-2016 Scion FR-S Front vs Rear Brakes: What Wears First and What to Replace

By Core Brake Parts Tech Team — Circleville, OH warehouse

On a 2012-2016 Scion FR-S the front brakes almost always wear out first. The car carries slightly more weight on the nose, and every stop shifts more weight forward, so the front pads and rotors do most of the work. The rears last longer, but they are not a lifetime part, and on a car that sees autocross or track days the gap between front and rear wear can shrink or change.

How the FR-S brake system is laid out

Scion built the FR-S with ventilated disc brakes on all four corners, not the front-disc, rear-drum setup found on many economy cars. That matters for a front-vs-rear question: you have pads and rotors at both ends, so both axles are real wear items that need checking.

Toyota rated the FR-S at a 53:47 front-to-rear weight ratio, which is unusually balanced for a road car. Balanced static weight is one reason this car handles so well, but it does not mean the brakes share the load evenly. Under braking the car pitches forward, the rear tires lose grip and the front tires gain it, so the front brakes have to supply most of the stopping force.

The car also runs ABS with Electronic Brake-force Distribution (EBD). Scion's own quick reference guide explains that abrupt stops make a vehicle tilt forward and reduce the braking power available at the rear wheels, and EBD responds by redistributing brake force among all four wheels. In plain terms: the system is constantly deciding how much rear brake the car can use, and on most stops that is far less than the front gets.

What wears first, and why it can change

For a daily-driven FR-S, expect to replace front pads before rear pads, and front rotors before rear rotors. A common real-world pattern on a street car is that the rear pads still have usable material when the fronts are done, so owners often do the rears on every second front job. That is a pattern, not a rule: measure, do not guess.

Three things can shift the balance:

• Hard driving and track use. Heat, not just mileage, eats pads. Repeated high-speed stops put huge heat into the front rotors, and fronts wear much faster than they do on the street.
• Brake modifications. Front big brake kits and aggressive pad compounds change the front-to-rear balance. Performance brake specialist RR Racing warns that insufficient rear bias on this platform leads to excessive heat and wear of the front brakes and unwanted ABS activation. Adding rear brake capacity, like the Brembo GT rear big brake kit for the 2012-2016 Scion FR-S, moves more of the work to the back.
• A sticking caliper. If one rear caliper slide pin seizes, that corner can drag and wear its pads quickly, sometimes faster than the front. Uneven wear side to side almost always points to a caliper or slide problem.

Symptoms: telling front from rear problems

Brake noises and vibrations do not always tell you which end is at fault, but some clues help:

• Steering wheel shake under braking usually points to the front rotors. Power Stop lists steering wheel vibration and a pulsing pedal among the signs of worn rotors.
• A pulsing pedal or seat-of-the-pants shudder with a steady steering wheel can come from the rear rotors.
• High-pitched squeal is often the wear indicator or worn friction material. Wagner notes that a completely worn pad causes high squeal and noise, and that worn or contaminated pads can make the car pull to one side.
• Grinding means metal on metal. Stop driving the car hard and inspect both axles right away, because a grinding pad destroys its rotor.
• Brake warning or ABS light needs attention. Low fluid from worn pads can trigger the brake warning light, and Power Stop lists an ABS warning among rotor-related signs.

The only reliable way to know which end needs work is to look. Pull the wheels, check pad thickness on the inner and outer pads, and measure the rotors.

How to inspect and measure

With the wheels off, check each pad through the caliper and compare inner to outer. A large difference between the inner and outer pad on the same caliper points to a sticking slide pin or piston. Then check the rotors:

1. Find the minimum thickness stamped on the rotor. Power Stop explains that it is engraved on the rotor edge, inside the cooling vanes, or on the hat.
2. Measure with a micrometer at the thinnest point of the pad contact area.
3. If the rotor is below the stamped minimum, replace it. Also replace it if it shows deep scoring, a big lip at the outer edge, or blue heat marks.

Always service brakes in axle pairs: both fronts together, or both rears together. Mixing a new pad on one side with an old pad on the other causes a pull.

What to replace, and what to replace with it

For the front axle, most owners do pads and rotors together. Power Stop recommends replacing pads and rotors at the same time so the new parts wear in together, and notes that putting new pads on old rotors can expose them to the old wear pattern. Shop brake pads and brake rotors, or choose low-dust ceramic brake pads for a street car.

At the same time, plan on:

• New hardware. Abutment clips and slide pin boots age with the pads. A brake hardware kit helps prevent squeal and uneven wear.
• Clean and lubricate the slide pins with brake-specific grease so the caliper floats freely.
• Inspect the hoses. Look for cracks and bulges. Track cars often move to stainless lines from our brake lines collection for a firmer pedal.
• Fresh fluid. Use the fluid type printed on the reservoir cap and in the owner's manual, and follow the factory change interval. Old, water-laden fluid boils sooner, which shows up first as a soft pedal after hard stops.

For the rear axle, the same pad-and-rotor logic applies. When you pull the rear rotors, check the parking brake operation and adjustment against the factory service manual before you button it up.

How hard is the job?

Front pads and rotors on the FR-S are a straightforward driveway job for someone with basic tools, a torque wrench and jack stands. Rears take a little longer because of the parking brake, but they are still well within home-mechanic territory. Torque the caliper bracket bolts and lug nuts to the values in the factory service manual; do not guess. Bed in the new pads per the pad maker's instructions so they transfer an even layer onto the rotor, and pump the pedal before the first drive so the pistons seat against the pads. If you need parts beyond pads and rotors, browse our full brake parts catalog.

Frequently Asked Questions

Do the front brakes on a Scion FR-S wear faster than the rear?

Yes, on almost every FR-S. Weight shifts forward when you brake, and the EBD system manages how much rear brake the car uses to keep the rear stable, so the front pads and rotors take most of the load.

Does the Scion FR-S have rear drum brakes?

No. Scion equipped the FR-S with ventilated disc brakes at all four corners, so the rear uses pads and rotors just like the front.

Should I replace front and rear brakes at the same time?

Not necessarily. Replace brakes by axle, based on measured wear. Many owners find the rears still have life when the fronts are done. Inspect both ends every time the wheels come off.

Can I install a rear big brake kit on the FR-S?

Yes. Rear kits exist for this car and are often used to restore front-to-rear balance after a front brake upgrade, because too little rear bias overworks the front brakes.

Why are my rear FR-S pads wearing faster than the fronts?

That is unusual and usually means a rear caliper is sticking, a slide pin is seized, or the parking brake is not fully releasing. Have the rear calipers and parking brake checked before fitting new pads.

Sources

1. Toyota USA Newsroom - 2013 Scion FR-S Brings the Sport Back to the Car - ventilated disc brakes on all four corners, 53:47 front-to-rear weight ratio
2. 2013 Scion FR-S Quick Reference Guide - ABS, Brake Assist and EBD operation, forward tilt reducing rear braking power
3. RR Racing - BRZ and FR-S Competition Rear Big Brake Kit - insufficient rear bias causes excess front brake heat and wear
4. Power Stop - Should I Replace Brake Pads and Rotors at the Same Time - replacing pads and rotors together
5. Power Stop - How to Tell If You Need New Brake Rotors - where minimum thickness is stamped, how to measure, rotor wear signs
6. Wagner Brake - Signs of Worn Brake Pads - squeal, pull and uneven wear causes