Scheduled maintenance: belt, radiator cap, brake fluid, water pump, fuel filter, p/s

[wdkwang]

So I was looking through the Nissan maintenance booklet and summed it up with this:

Every 1 year or 15,000 miles:
In-Cabin Filter

Every 2 years or 30,000 miles:
Radiator fluid
Transmission fluid (Red Line MT-85 - 3 Qt)
Differential fluid (Red Line 75W90 - 2 Qt)
Engine Drive Belt
Radiator Cap

Spark plugs:
4 years or 60,000 miles
7 years or 105,000 miles


So something I didn't know was changing the radiator cap every 30k miles. Is this necessary?
30k miles for a timing belt seems like a very short lifespan imo. Opinions?

When are you supposed to change the water pump, brake fluid, clutch fluid, fuel filter, and power steering? Thank you.