Me personally I keep up with my cars as I tow with them and go all over.I never break down. I like preventative maintenance cause its cheaper ( no big repair bills) and your not stranded You car is 5 years old has some miles and you seem to want to keep it. Then change it.a $100ish transmission flush is a lot cheaper then a $2000 ish transmission. It does a lot work. Trick with flushes is you have to get them down early or you can't do them.
Id leave the break fluid alone as sometimes fittings can break if never opened before. Then you got the abs to deal with. Its a good idea thought. I normally use a turkey baster and change the fluid in the reservoir Old fluids do cause problems. Break fluids get dirty and full of moisture. Id only flush it when doing breaks.
I also use the baster to drain the power steering reservoir so it can be refilled with fresh fluid every couple of years. I run the car get almost complete empty, fill it up turn the wheels then repeat 3 - 4 times.
Every 3000ish miles you also should be running a can of injector clearer. Its only $2 for concentrated stuff. Cheap pay off.
Its best to keep up on the transmission fluids It gets almost 100 percent of the fluids out. If you get the flushes done early you can keep doing flushed . If you let it go for 100k plus you can only safety drain a few quarts out and change the filter. Even if you only get flushes every other time should have the filter changed too.
I used to work at a few fast lube places. Heard story's of flushes on old cars that were never taken car off. After the flush they would not make it out so we would never do flushes on those cars. If it was kept up on we could flush them out with no problems.
If not mistaken yours is good for 100k. So you may not want to get it now but I wouldn't go till 100k. A transmission flush is a lot cheaper then a transmission. I change my fluids every 2 years. but that's just me. I do not go through transmissions either. Yet I tow bigger vehicles then mine in my little s10.
The issue with brake fluid is that it absorbs moisture. When this moisture laden fluid is in the caliper, the heat generated can cause it to boil. Most people don't use there brakes that hard, but if you drive in the hills or tow something, this situation can come into play.
Here is a good link yahoo has about it.
For optimum protection, change the fluid and filter every 30,000 miles (unless you have a new vehicle that is filled with Dexron III ATF which is supposed to be good for 100,000 miles).
If you think this is propaganda put forth by the suppliers of ATF to sell more fluid, think again. According to the Automatic Transmission Rebuilders Association, 90% of ALL transmission failures are caused by overheating. And most of these can be blamed on worn out fluid that should have been replaced.
On most vehicles, the automatic transmission fluid is cooled by a small heat exchanger inside the bottom or end tank of the radiator. Hot ATF from the transmission circulates through a short loop of pipe and is thus "cooled." Cooling is a relative term here, however, because the radiator itself may be running at anywhere from 180 to 220 degrees F.!
Tests have shown that the typical original equipment oil cooler is marginal at best. ATF that enters the radiator cooler at 300 degrees F. leaves at 240 to 270 degrees F., which is only a 10 to 20% drop in temperature, and is nowhere good enough for extended fluid life.
Any number of things can push ATF temperatures beyond the system's ability to maintain safe limits: towing a trailer, mountain driving, driving at sustained high speeds during hot weather, stop-and-go driving in city traffic, "rocking" an automatic transmission from drive to reverse to free a tire from mud or snow, etc. Problems in the cooling system itself such as a low coolant level, a defective cooling fan, fan clutch, thermostat or water pump, an obstructed radiator, etc., will also diminish ATF cooling efficiency. In some cases, transmission overheating can even lead to engine coolant overheating! That's why there's a good demand for auxiliary add-on transmission cooler
http://autos.yahoo.com/maintain/repairqa/transmission/ques123_0.html