Buffalo Benelli Classica Series Instruction Manual page 28

Wear of Brake Pad
Most brake pads for rim brakes come with
grooves or notches.
If these grooves are worn and can no longer
be seen, this is normally a sign that the brake
pad is worn.
pads are worn. Have them replaced by a professional bike
workshop instead.
If required, you can readjust the rebound force via the spring adjustment screw so that both
brake arms move symmetrically. Once you have done this, check that the brake is working
properly (see "Readjusting the brake").
that it is not possible to readjust it, have your bike checked at a professional bike workshop
and replace the brake block.
incorrectly, this poses a risk of injury to the rider. Have the derailleur gears adjusted at a
professional bike workshop.
NOTE: Always contact your specialist cycle shop if:
If you notice the chain jumps on the chain rings or sprockets when riding
If you hear unusual noises or you cannot change gears easily
If the front derailleur, rear derailleur, or other gear-shift components are loose, damaged or
distorted.
If chain links are defective or worn.
Do not ride your bike if the brake
If the brake is still not working properly, or the brake pad is so worn
If gear-shift components are loose, worn, damaged or adjusted
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