The short answer
None of these patterns make your car stop harder from cold. What they do is stop your brakes fading when they get hot, and clear water, dust and gas from between the pad and the disc.
- Grooved: the sensible all-rounder. Best choice for most road cars.
- Hooked: grooved with a curved slot. Same benefits, quieter, kinder to pads.
- Drilled: best cooling and the best looking. More prone to cracking if worked very hard.
- Drilled and grooved: both at once. The usual fast-road choice.
Browse what we stock in OMI Performance.
What is actually happening when brakes fade
Braking turns speed into heat. A hard stop from motorway speed can put a disc well past 500°C.
Two things then go wrong. The pad material starts to break down and give off gas, and that gas forms a thin cushion between pad and disc. Any water or dust sitting on the surface does the same. The pedal goes long, the car stops less well, and that is fade.
Every pattern on a performance disc exists to deal with that: give the heat somewhere to go, and give the gas and grit somewhere to escape.
Grooved discs
Straight slots machined across the face. As the disc turns, each slot passes under the pad and scrapes the surface clean, taking gas, dust and water with it.
Good: consistent pedal feel when hot, excellent in the wet, keeps the pad face fresh, structurally almost as strong as a plain disc.
Less good: wears pads a little faster, can sing slightly at low speed.
Buy them if: you drive briskly on real roads, tow, or carry weight. This is the default recommendation for a road car and we are not going to talk you into something dearer.
Hooked discs
A grooved disc where the slot is curved rather than straight, so it meets the pad progressively instead of all at once.
Good: same cleaning effect as grooved, noticeably quieter, gentler on pads, often a touch stronger because the slot does not run straight across the face.
Less good: usually costs a little more.
Buy them if: you want grooved performance on a car you also use every day and do not want brake noise on the school run.
Drilled discs
Holes cast or machined through the disc face. They let heat out from inside the disc and give gas a direct escape route.
Good: the best cooling of the three, lighter than a solid disc, and the look most people are actually buying.
Less good: every hole is a stress point. Under sustained very heavy use — repeated track sessions, a heavy car down a mountain pass — hairline cracks can form between holes. On quality cast discs on a road car this is uncommon, but it is the honest trade-off.
Buy them if: you want cooling and appearance, and your hardest use is spirited road driving rather than a full track day.
Drilled and grooved together
What most people fit. Holes for cooling, grooves for clearing. More cooling than grooved alone, better fade resistance than drilled alone, and it looks the part through an open wheel.
It is the usual choice for a fast road car, and the one we sell most of.
Side by side
| Plain | Grooved | Hooked | Drilled | Drilled & grooved | |
|---|---|---|---|---|---|
| Cooling | Baseline | Slight | Slight | Best | Very good |
| Clears gas and water | No | Yes | Yes | Some | Yes |
| Noise | None | Some | Little | None | Some |
| Pad wear | Lowest | Higher | Moderate | Low | Higher |
| Crack risk when very hot | Lowest | Low | Low | Highest | Moderate |
When a plain disc is the right answer
If your car is a normal commuter, you do not tow, you do not drive hard, and the brakes have never felt soft after a long descent — fit good plain discs and decent pads and spend the difference on tyres. Tyres change braking distance far more than disc patterns do.
We would rather tell you that than sell you something you will not feel.
Things people get wrong
"Performance discs give a shorter stopping distance"
From cold, no. Stopping distance is set by tyres, pads and the car's weight. Patterned discs keep braking consistent when hot, which is a different and often more useful thing.
"I only need to do the fronts"
Fronts do roughly 70% of the work, so front-only is a reasonable upgrade. Just do not mix patterns across an axle — both sides of the same axle must match.
"New discs can go straight on"
Fit new pads with new discs and bed them in: a series of moderate stops from around 50mph with cooling in between, no hard stops, and avoid sitting with your foot on the pedal while hot. Skip this and you get uneven pad deposits, which feel exactly like a warped disc.
"My disc is warped"
Almost never. Judder is nearly always uneven pad material on the disc face, from heavy braking followed by sitting still with the pedal pressed. Correct bedding usually prevents it.
Getting the right size
Disc diameter is fixed by your caliper and carrier. A 345mm disc does not fit a car built around 312mm without changing more than the disc.
Our listings give the diameter in the title, so match that to what is on your car. If you are not sure, send us the make, model, engine and year and we will confirm it.
While you are under there
Brakes are usually one job in a list. Our performance range also covers cooling and radiators, cold air induction, intercoolers, lowering springs, strut braces and exhaust components — and the grille range if the front of the car is coming apart anyway.
New discs behind tired wheels is a shame, so it is also the moment people look at a new set of alloys.
Ask before you order
Send the make, model, engine and year to sales@omiwheels.com, message OMI on WhatsApp or call 028 6625 1123, and we will tell you what fits — including when the cheaper disc is the right one.
We ship from Enniskillen, Northern Ireland, so orders to Ireland and the EU arrive with no customs declarations and no import duty.