You find the braking point with a fixed marker, not courage: set it, brake in a straight line and move it later lap by lap without locking up the rear.
The honest answer: You do not find the right braking point with courage but with a fixed marker at the trackside. You brake in a straight line at exactly that marker, press the pedal firmly but not abruptly, and move the marker a little further back lap by lap. It sounds unspectacular. But it is the most honest shortcut to faster laps.
Why the marker? Because your feel in a kart is deceptive. Speed seems wilder in a seat just above the ground than it is, and the trackside looks different every lap if you brake by eye. If you always brake at the same point, you can compare cleanly: was that too early or too late?
The same principle runs through car racing. An analysis of 60 years of racing-driver textbooks found reference points (braking markers, apexes, shift points) as a central aid and noted that the position of the apex largely determines the timing and strength of braking [1]. That is a TRANSFER from cars, but the logic applies to karts just the same. There is no dedicated study on the braking point in karting itself. The practice rules below therefore carry no source number.
Pick a corner at the end of a straight that you can see early. Not the corner behind a crest, not the chicane. For now you want to learn only one thing.
Find a fixed point at the edge that you see every lap: the end of a kerb, a sign, the corner of a tyre stack, a distinctive patch in the asphalt. The kart ahead of you is not a marker, it moves. Choose the marker so that you can aim at it safely on the straight.
In the first laps you brake well before the marker, with room for a mistake. Press the pedal firmly and progressively: build pressure quickly, but do not stamp. Motorsport driver manuals describe this as squeezing the brake, not stamping on it [1]. You brake in a straight line while the kart is still straight.
Towards the end of the braking phase you deliberately take the pressure off. The kart should almost roll freely as you turn in. Brake and steering share the same grip. If you are still braking hard while turning in, the front axle pushes wide. Deliberately carrying the brake into the corner is a technique for later (trail braking), not for this step.
Now comes the real learning step: each lap you move the start of braking about one kart length later, roughly two metres. That is a rule of thumb from practice, not a study finding.
Your milestone: you hit the marker three laps in a row to about one metre, the kart is calm at the turn-in point, the rear axle does not lock, and the corner exit does not get worse. If the exit gets worse or the rear steps out, you go back one marker. That is your braking point for today. Next time you start there.
Late braking is not a test of courage. You feel your way towards the braking point, you do not force it. Build-up instead of shortcuts means: first too early, then metre by metre later.
Whoever drives behind you does not always see your brake light in time. So never brake abruptly and without reason in the middle of the straight. If a marshal shows a yellow flag, you reduce speed and do not overtake. Double-waved means the track is fully or partly blocked, be ready to take an unusual line or stop [2]. On a wet track you set your marker much earlier.
This guide explains and motivates, it does not replace supervised training. An instructor next to you spots locking rear wheels much faster than you do.
Set two markers instead of one: one for the start of braking, a second where you release the pressure. That way you separate two errors you otherwise cannot tell apart: braked too late or stayed on the brake too long. The idea of using braking markers, apexes and shift points as fixed waypoints is well described in motorsport driver books [1]. Splitting it into two markers is coaching practice.
There is no point that applies to everyone. It depends on speed, corner and kart. You find it by choosing a fixed marker at the trackside, braking much earlier at first and moving the marker a little further back lap by lap until the corner exit gets worse.
In most karts the brake is on the left and the throttle on the right. Whether you operate both pedals with one foot as a beginner or brake with the left is something you clarify in the track briefing. Nothing is documented on this. In competition the left foot is often used for braking so that brake and throttle can overlap (practice).
Trail braking means not fully releasing the brake pressure on turn-in but letting it fade slowly towards the apex. It is an advanced technique. As a beginner you first learn to brake straight and release before turning in.
Almost always it is the entry: you brake too late or without a fixed marker, turn in with residual brake and push wide. Then you also lose the exit and with it the whole following straight. Whoever brakes earlier and turns in cleanly is often faster.
The Apex in Karting: Why It Usually Comes Later Than You Think