The disk brakes practically don't brake anymore. If I pull the brake lever as hard as I can, the wheel still turns if I push the bike forward.
Is this normal? Do they need a "brake in" period?
UPDATE: It's a mechanical brake, and the levers are properly adjusted. If I pull the brake lever, I can see the pads pressed against the rotor, but the wheel still turns slowly If I push the bike. This was not happening before.
The maintenance was done at a local bike service, I don't know exactly what they did to the brakes, but the rotor seems to be oiled up.