Drag brake is the braking force an electronic speed control applies automatically at neutral throttle, standing in for engine braking. Most ESCs set it as a percentage from 0 to 100, where 100% holds the car on an incline.
Every brand spells it differently, so a value copied off another racer’s setup sheet doesn’t transfer. Hobbywing’s XR10 Pro G3 sets drag brake force from 0% to 100% in 1% steps, then adds separate drag brake acceleration control (Auto, or 1–20) and drag brake frequency (1K–16K). Tekin’s RSX Pro gives 13 steps on the onboard QuickTune but 0–100 in the HotWire software, and lets you move it mid-run off a third channel. Castle runs a straight percentage and recommends a “Medium” or “Slow” ramp above 50%, with about 20% as its ceiling for trail running. Tekin’s other warning is worth reading twice: a neutral width set too low on your radio can make drag brake behave erratically.
Drag brake is a free, tool-free change that alters every corner entry, and because the scale differs by brand, a value copied from another racer's ESC can behave nothing like it did on their car.