When do you change Timing Belts on a Toyota Corolla?
Major job requiring special tools and skill. If you don't know what you are doing, take it to an expert. Serious damage can occur if done incorrectly. Most timing belts should be changed every 60,000 miles. It is a complex job but if you get a good manual it describes both the correct intervals and the procedure to change it. No Belts! Check with with dealership. Most new corolla's have chains. They last forever! I have a 93 corolla with 500,000 miles on it and I change my BELT every 100,000 miles. No chain. Had an old 89 GTS with a chain and when it broke it was a dickens to fix. bent a valve too.
I have never seen a timing belt break due to pre-mature wear! seriously! only from the water pump failing. And yes I would do the water pump at 60,000 just to be safe and it is cheaper to do when you do the timing belt...
i also recommend you change the crank and cam seals. And by the way anything can break its called metal fatigue chains where replaced in the 80`s I haven't seen a chain in years.