Learn how aircraft differential braking applies left and right brakes independently, when pilots use it, and how to avoid skids and excess brake wear.
Differential braking turns an aircraft on the ground by applying more brake pressure to one side’s main wheel or wheel group than the other. The extra drag yaws the aircraft towards the braked side. Pilots control it through independent toe brakes, usually alongside rudder or nosewheel steering.
In aviation and real-world flying, aircraft differential braking means unequal left-to-right brake pressure, not locking one wheel. A small pressure difference is often enough to correct direction or tighten a taxi turn.
How does differential braking turn an aircraft?
Applying the right brake creates extra drag at the right main landing gear, producing a yawing moment that turns the aircraft right; applying the left brake turns it left.
On many light aircraft, pressing the upper part of each rudder pedal operates a separate brake master cylinder for that side. Larger aircraft may command left and right brake groups, while individual anti-skid valves regulate the wheels within each group. Our guide to how aircraft wheel brakes create and control stopping force explains the wider hydraulic system.
A free-castering nosewheel or unlocked tailwheel swivels as the aircraft begins to yaw. If the aircraft is stationary, the brake alone cannot create a turn; thrust must move the aircraft and pull it around the braked wheel. A parking brake normally holds both sides and should not be used for steering. Differential thrust is also a separate technique.
When should pilots use differential braking?
Differential braking is mainly a low-speed taxi control used when rudder or nosewheel steering cannot produce the required turn.
| Aircraft configuration | Typical use of differential braking |
|---|---|
| Steerable nosewheel | Supplements pedal-linked steering or a tiller during tight turns. |
| Free-castering nosewheel | Provides much of the directional control at low speed, usually with gentle power. |
| Tailwheel aircraft | Assists the tailwheel and rudder or tightens a turn after the tailwheel unlocks. |
| Large transport aircraft | Used sparingly alongside nosewheel tiller steering, particularly for tight manoeuvring. |
At higher ground speeds, rudder authority and nosewheel steering normally become more effective. A pilot should not habitually steer along the taxiway by riding one brake, because that generates heat and uneven wear. The interaction between these controls is covered in our practical explanation of taxi speed and aircraft steering.
How do you apply differential braking safely?
The aircraft flight manual or operating handbook takes priority, but the basic technique is consistent across most types.
- Reduce taxi speed first. Tight turns should begin slowly enough that momentum will not overpower the tyres’ available grip.
- Use normal steering. Apply rudder, pedal-linked nosewheel steering or the tiller before adding brake.
- Press the inside brake smoothly. For a left turn, increase left toe-brake pressure while keeping the right brake released or lightly applied.
- Add only the power required. Free-castering aircraft may need some thrust to keep moving, but prolonged power against a brake rapidly creates heat.
- Release the brake progressively. Centre the steering as the aircraft reaches the new heading, then use equal braking if a stop is required.
On take-off or landing, abrupt differential braking can cause a swerve, tyre skid or loss of directional control. Use it only as permitted by the aircraft procedure and with much smaller inputs than during a tight taxi turn.
What commonly goes wrong?
- Accidental toe-brake input: pushing hard rudder while resting the toes high on the pedals can apply a brake unintentionally.
- Excess power against the brake: this overheats the brake and may damage tyres, wheels or nearby components.
- Abrupt braking on a slippery surface: a locked inside wheel slides instead of helping the aircraft turn. Anti-skid protection varies and may be reduced or unavailable at very low speed; see how anti-skid adjusts pressure at individual wheels.
- Trying to pivot around a locked wheel: this can scrub a tyre and imposes unnecessary loads on the landing gear. Heavy braking in some tailwheel aircraft also increases the risk of a nose-over.
- Masking a mechanical problem: if equal pedal pressure consistently pulls the aircraft to one side, the cause may be brake drag, contamination, unequal tyre pressure or a brake-system fault.
Why can differential braking feel wrong in a flight simulator?
Flight simulators use the same principle, but control assignments often make differential braking feel abrupt or ineffective.
Keyboard and button commands are usually on-or-off, while real toe brakes provide proportional pressure. For better control, assign separate left- and right-brake axes, calibrate their dead zones, check that neither axis is inverted and remove duplicate bindings. Combined-brake commands, steering assists and auto-rudder can otherwise fight the pedal inputs. Our MSFS ground-steering control setup covers those assignments in practical detail.