Trail braking in iRacing: what it is and how to practise it
Ask a fast iRacing driver what got them out of the midfield and trail braking comes up almost every time. It’s also one of the most misunderstood techniques in sim racing. People hear the term, try holding the brake into a corner, spin at the first hairpin, and decide it’s something only aliens do. It’s a skill you can build in a few focused sessions, as long as you practise the right part of it.
What trail braking is
Trail braking means you carry some brake pressure past the turn-in point and release it gradually as the steering goes on. You don’t finish all your braking in a straight line.
Most of us start with the simple version: brake hard in a straight line, come off the brake completely, then turn. It’s a sensible place to begin because it keeps one input happening at a time. Trail braking overlaps those last two steps. You’re still easing off the brake while the car starts rotating into the corner, so for a short period the tyres are doing two jobs at once: slowing the car and turning it.
The key word is “gradually”, because most of the skill is in how you let the brake go. A driver who stamps on the brake, holds 80% into the apex and then lifts off has technically braked while turning, but that’s going to end in the gravel. What you’re after is a release that starts around turn-in and bleeds away smoothly, with the last few percent of pedal disappearing somewhere between turn-in and the apex, depending on the corner.
Every driver trails the brake a tiny bit, because nobody’s foot comes off the pedal instantly. The question is how deliberately you use that overlap, which is why it takes practice.
Why it makes you faster
The first reason is weight on the front tyres. Braking shifts load forward, and that load gives the fronts more grip. Release the brake completely before you turn and the load shifts back, so the front loses bite at exactly the moment you’re asking it to steer. A bit of brake held through turn-in keeps the grip there when you need it. Without trail braking the car tends to feel lazy on turn-in, as if you’ve turned the wheel and it’s thinking about it. With a little brake still on, the nose bites and the car points at the apex straight away.
The second reason is that you can brake later. You’re still slowing down after turn-in, so you don’t have to get all the braking done before the corner. The brake point moves later and the straight-line braking zone gets shorter. Into Turn 1 at Watkins Glen or the La Source hairpin at Spa, that’s a real chunk of time, because you’re spending longer at high speed before you commit to slowing down.
The third is rotation. A car that’s still carrying some brake has a lighter rear, and a lighter rear is more willing to rotate. Used well, that lets you get the car turned early in the corner, which means you can straighten the wheel sooner and get back to the throttle earlier. The entry gain is nice, but the exit gain carries all the way down the next straight, and you’re no longer waiting for understeer to settle. If you’ve read our guide to throttle control on corner exit, this is the setup for that: a car that’s already pointed where it needs to go can take throttle sooner and harder.
What it feels like, and what it looks like on a trace
From the seat, good trail braking feels like one continuous motion. Your foot eases off the brake at the same rate your hands wind on the lock, and the car flows from braking into the corner without a clear moment where one ends and the other begins. If you notice a pause, a point where the car goes light and you’re coasting with neither brake nor throttle, that’s the gap trail braking is meant to fill.
Bad trail braking has its own feel. Too much pressure too deep and the rear goes light enough to step out, usually right as you approach the apex, and you end up catching a slide or spinning. Releasing in steps (on, off a bit, hold, off a bit more) makes the car pitch around underneath you, and it feels unsettled and hard to place.
On a telemetry trace, good trail braking has a clear shape:
- A sharp initial spike to peak pressure.
- A long, smooth taper back to zero instead of a sudden drop.
- That taper overlapping with the steering trace as it ramps up.
The release is where most people go wrong. If your brake trace falls off a cliff from 60% to 0% right at turn-in, you aren’t trail braking, however good the peak pressure and brake point look. Line your brake trace up against a faster driver’s in the same car and you’ll often see that their peak is similar to yours, and their brake point might even be similar, but their release is two or three times longer. There’s more on reading these traces in how to read iRacing telemetry, and if your issue is really the brake point itself, the brake points guide covers that first.
How much, and where
A little trail brake goes a long way. In most cars it’s the last 10 to 20% of pedal travel that you carry into the corner, and half the pedal is far too much. The initial hit is where the heavy slowing happens. The trail is a small amount of pressure used to manage the balance of the car. I find it helps to think of it as a steering aid.
It matters most in medium and slow corners with a heavy braking zone before them. Think of the hairpin at Okayama, Turn 1 at Summit Point, the chicane at the end of the back straight at Road Atlanta, or the first chicane at Monza. Fast, flowing corners often need little or no trail braking. Forcing a long trail through a quick sweeper just scrubs off speed you didn’t need to lose.
The car matters just as much. Light, low-grip cars like the Global Mazda MX-5, the Skip Barber and the Formula Vee reward trail braking and punish its absence, because they need all the front grip they can get on entry. They’re also forgiving enough to learn on, since everything happens slowly and a mistake usually means a quick moment of oversteer instead of a heavy crash. The Ray FF1600 is sensitive to how you release the brake and makes a great teacher for that reason.
Cars with ABS, like most GT3 and GT4 machinery, need a slightly different mindset. The ABS takes care of the peak pressure for you, so there’s less to gain from perfecting the initial hit and more from how you release. You can often trail the brake deeper into the corner than you’d dare in an MX-5, because the car won’t lock a front wheel if you get it slightly wrong. High-downforce cars also lose grip as they slow, which changes where in the corner you want the brake fully gone. The principle stays the same while the amount changes, so treat any new car as a fresh experiment.
Three drills to build it
These work best in a test session or an open practice, with no pressure on lap times. Pick a car you know and a track you know. If the circuit is new to you, work through how to learn a new track first, because doing both at once is too much.
1. One-corner practice
Find a single slow corner with a heavy braking zone. A hairpin at the end of a long straight is ideal, in a low-powered car like the MX-5. Turn 11 at Laguna Seca works nicely, as does the hairpin at Okayama. Do 15 to 20 laps thinking about nothing but that corner.
The only goal is a release that takes roughly as long as the turn-in phase. Keep your usual brake point and initial hit for now, and focus entirely on letting it go slowly as you turn in. You’ll probably find you’re slow for the first few laps, because you’re braking in the old place and still slowing after turn-in. That’s fine, and it means you’re doing it.
2. Brake later, one marker at a time
When the release starts to feel natural, move your brake point one marker later. The trail phase now has extra speed to scrub off. Do another 10 laps at the new point before moving again.
Listen to what the car tells you. If it starts pushing wide, you’re releasing too early. If it snaps round on you, you’re carrying too much pressure too deep. When you run out of room (you can’t brake any later without missing the apex even with a good trail) go back one marker and bank that as your reference.
3. Match the release to the steering
Try to get the brake release and the steering input mirroring each other, so one goes down as the other goes up. Some drivers find it helps to picture the brake pedal and the wheel tied together with a piece of string: as the wheel turns, the string pulls your foot off the pedal.
Do this one on a lap with several braking zones of different types, and aim for five clean laps in a row with the same feel at each corner. When it clicks, you’ll stop thinking about the brake and steering as two separate inputs, and you’ll notice you’re doing it in corners you never practised.
Common mistakes and why they happen
The most common mistake is too much pressure too deep. It happens because drivers hear “hold the brake into the corner” and hold the whole brake into the corner. The rear goes light, the car rotates too much, and they either spin or end up so cautious afterwards that they abandon the idea. If you’re spinning, halve the amount of brake you’re carrying past turn-in and try again.
The second is trying it everywhere. Once people discover it works, they use it in fast sweepers too, where it costs time. Save the long trail for the heavy braking zones.
A third is releasing in steps. This usually comes from a pedal setup that isn’t great, or from nerves. Drivers ease off, get worried, hold, ease off again. Check that your pedal is calibrated so the full range is usable and not bunched up at one end, and try a few laps where you exaggerate the smoothness just to get the feel.
The last is ignoring the car and bringing habits straight across. I spent a whole season carrying MX-5 levels of trail brake into a GT4 car and wondering why it felt inert on entry. It wanted more, and later, and I was too cautious to find out.
How to tell if it’s working
Judge it on lap time over a whole session. One hero lap proves nothing. If your minimum corner speed goes up and your incident count doesn’t, you’re getting it right. A good trail braking habit should also make your entries more repeatable. Our consistency guide has more on measuring that.
Compare your brake trace to your own from before you started. If the peak and brake point haven’t changed but the taper has, and the lap times are coming down, you’re on the right track.
If you want a more direct read, Sim Sense scores your trail braking and brake release smoothness corner by corner against a reference lap in the same car, so you can see which corners are getting better and which still need work. The telemetry analysis is included on the free tier.