Here is how to fix sqeaky bicycle brakes on your bike. If your bike squeaks when you stop, and it has rubber rim-pad brakes, here's how to stop the squeaking noise from happening. Squeaky brakes are easy to fix. To quiet squeaky bike brakes, first wash the rim and brake pads with something that isn't oily. Try plain water or rubbing alcohol.
If your bicycle brakes keep squeaking and making noise, try sanding down the brake pads a little bit with sandpaper, and then clean the bicycle brake pads to remove any sand from the sand paper.
This should quiet your squeaky bicycle brakes. If your bike's brake still make a squeaking noise, try new brake pads. If new brake pads don't stop the squeaking, try rubbing the rim with steel wool to smooth it out. This is how to quiet squeaky bicycle brakes.