How to Bed In Carbon Ceramic Brake Discs (The Right Street Way)
Created on 09.28
Just got your new carbon ceramic brake discs fitted? Chances are you’re itching to slam on the pedal and feel that famous crisp stopping power.
Hold off for a minute.
A lot of people think high-end carbon ceramic rotors come ready to go straight out the box — no break-in needed, just install and drive hard. Then a week later they’re dealing with brake judder, inconsistent pedal feel, or weird noise, and immediately assume the discs are defective.
Nine times out of ten, it’s just a bad bed-in procedure.
Carbon ceramic brakes work differently from old cast iron rotors. They’re harder, denser, and they need a proper break-in (we call it bedding in) to reach their full performance and last as long as they should.
Today we’re breaking this down in plain English. No fancy engineering terms, just the steps that actually work for street-driven cars.
Wait — why do I even need to bed them in?
Let’s keep this simple.
Brand new discs and pads look smooth to the naked eye, but on a microscopic level, both surfaces have tiny bumps and gaps. When you first fit them, only a tiny percentage of the pad is actually touching the disc.
Bedding in is the process of heating the pads up gently, so a thin, even layer of pad material transfers evenly across the whole disc surface. This is called the transfer layer, and it's what gives you consistent friction, solid pedal feel, and no judder.
Cast iron rotors are forgiving — you can get away with a lazy break-in and they’ll still sort of work. Carbon ceramic is much less forgiving. Skip this step, and you’ll end up with uneven pad deposit, hot spots, and vibration that won’t go away on its own.
You spent good money on this upgrade. Don’t ruin it in the first 50 kilometers.
Step-by-step street bed-in procedure
This is for regular street use, not full track race bedding. First, find a long, quiet, straight road with barely any traffic — safety first, obviously.
Phase 1: Gentle warm-up
Get everything up to working temperature slowly, no shock heating.
- Accelerate to about 50–60 km/h
- Brake with light-to-moderate pressure (roughly 30-40% of full pedal force) and slow down to around 15 km/h
- Do not come to a complete stop.
- Repeat this 8–10 times
Phase 2: Core bedding-in
This is where you build that even transfer layer.
- Accelerate to 80 km/h
- Apply firm, steady brake pressure — around 60-70% force, hard enough for solid deceleration but not hard enough to kick on ABS
- Slow down to 15 km/h. Again, do NOT stop completely
- Accelerate immediately back to 80 km/h and do it again
- Repeat 10–12 times
You might start to smell a faint hot brake smell, or notice the pedal feeling a little firmer each time. That’s totally normal — it means the transfer layer is forming.
Phase 3: Cool down properly (the most skipped step)
This is the part almost everyone messes up.
After your last braking cycle, keep driving at 60–80 km/h for 10–15 minutes without touching the brakes at all. Let the airflow cool everything down slowly and evenly.
Then park up and let them cool fully to room temperature. Don’t spray water on them, don’t park right in front of a fan, and don’t yank the handbrake hard if you can avoid it.
Fast temperature shock is bad news for carbon ceramic. Slow, even cooling is how you lock in that nice even transfer layer.
What to avoid during break-in
Memorize these. Most bad bed-ins happen because of one of these:
- Never come to a full dead stop while the brakes are hot. If you hold a hot pad stationary against a hot disc, it bakes a thick patch of pad material onto the surface. That patch will cause vibration forever.
- Don’t do hard highway stops or long mountain descents in the first 500 km
- Don’t go to a track day before they’re fully broken in
- Never splash cold water on hot rotors. Not after bedding in, not ever.
- Don’t drag the brake pedal or ride the brakes downhill — sustained heat causes uneven wear.
How do I know when they’re done?
For normal street driving, plan on about 300–500 km of mostly gentle driving to fully finish the break-in period.
You’ll know it’s working when:
- The brake pedal feels firm and consistent, not spongy or vague
- Braking power is predictable — you get the same amount of stop every time you press the pedal
- Any faint rubbing noise fades away
Once you hit that point, you can use them normally and really feel what carbon ceramic brakes are supposed to feel like.
Quick common questions
Q: Do mirror finish carbon ceramic discs still need bedding in?A: Yes. Mirror finish is smoother out the box, but you still need to build that even transfer layer between pad and disc. It might happen a little faster, but don’t skip the steps.
Q: Is it normal to smell brakes during bedding?A: Totally normal. You’re heating up the pad resin and transferring material. If it’s a strong acrid smell that doesn’t go away after cooling, then you might have overdone it.
Q: I messed up the bed-in and now I have judder. Can I fix it? A: If it's mild, you can try cleaning the disc surface with brake cleaner and running through the full procedure again. If there's already a thick uneven pad deposit or visible scoring, you'll likely need new pads and to start over.
At the end of the day, bedding in carbon ceramic brakes isn't rocket science. It's just slow warm-up, steady pressure, and gradual cooling.
Spend an hour doing it properly, and you'll get years of smooth, consistent, rust-free braking out of your discs. Skip it, and you'll be chasing vibration and poor feel for as long as they're on the car.
If you’re not sure about your specific setup, or need help picking the right pads to match your discs, drop us a message anytime.
WhatsApp