brake fluid changes and brake inspections should be done atleast every two years, mainly the brake fluid has a tendancy to soak up moisture in the air and then this accumulated water tends to boil in the lines and calipers and brake cylinders during use, causing air pockets and a degradtion of braking, and can cause a complete loss of brakes at times.
PS should be 18000 miles and brake fluid about 30000 miles PS should be 18000 miles and brake fluid about 30000 miles
There is no set time or even mileage to change ANY brake pads. It depends entirely on the quality of pads and how you drive. -You should check them every 6 months and when they get down to 3/32 of brake material that's the time to change.
once a year
It depends on the brand of brake pad and your driving habits. Normally, you'll get somewhere between 30,000 - 50,000 miles from a set of pads.
There is no magic number as to how often you should change your brakes. Brakes will wear down differently depending on the make of the brake and they will start squeaking so you know that you need to change it.
There is no set time to change the pads. How often depends on how you drive. They may last 20,000 to 80,000. Inspect them every so often and listen for the squeal of the warning device. Replace immediately if you hear this.
The make and model of truck doesn't matter. When the shoes get down to 1/4 inch, you replace them.
When they wear out. Can be between 10,000 miles and 100,000 miles depending on driving habits.
brake linings should be checked at 15,000 and 25,000 miles and then every 5,000 miles after that.
How often should you change the fuel filter?
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If, as you say, it needs doing then it should be done as soon as possible. Brake fluid seldom needs changing though it does degenerate over time, mainly by absorbing moisture. The precise detail will be in your manual. The fluid reservoir needs checking topping up occasionally and certainly will require it after a brake pad change.