Working on an old bike? The brake pads are probably dry and cracking. Riding on the regular? They might be oily or just plain worn down. Whatever the reason, new brake pads can make the difference between stopping and slowly squealing through a stop sign.
Cheap pads for caliper brakes: $1 per pair.
Basic V-Brake pads: $5 per pair.
Canti pads: $7 per pair.
Performance pads for road and V-brakes: $15+ per pair