Safety - Keeping your bike in safe and roadworthy condition

Brakes
Re-adjust or replace brake blocks when they start to lose effectiveness. Replace brake cables if you notice any signs of fraying.
Tyres
Keep well inflated. Replace when the tread becomes worn: as well as having poor grip, a worn tyre is more easily punctured.
General
Investigate any unusual noise - it may be indicating something in need of repair. Make sure that there is nothing loose that could get caught in a wheel.
Need help?
Bike shops service as well as sell bikes. For example, Cogz bike shop on campus charges 25 for a basic service and around 10 to replace a flat innertube.