1 Prepare safe work
Set up your bike stably, clear the work area and photograph the position of shims and cables before removal. For an electric bike, turn off the system and remove the battery.
⚠ Warning: A soft lever, leaking or a lever touching the handlebars makes the bike unsafe to ride.
2 Inspect for leaks and pad thickness
Look for a wet mark near the lever, hose and caliper. Leaking means the bike is not ridden until repair.
3 Align bike and try stabilization
If your bike was turned upside down, place it upright and gently squeeze the lever several times. Temporary improvement still indicates air.
4 Bleed only with the appropriate kit
Use only the fluid prescribed for your system, because DOT and mineral oil are not interchangeable. Without instructions and tools, leave the job to the service.
? Tip: Photograph the initial state and change only one thing at a time. This way you’ll know which check actually affected the problem.
5 Assemble, test and set limits
Turn the wheel and drivetrain by hand, then do a slow test ride in a traffic-free area. Your brakes, wheels and steering must work completely predictably before normal riding.