How many miles on the car?

What's listed in the manual/glove box is what you can use. I would
increase it by about 5 psi from that number (usually comes down to
35psi) to get more miles out of the tires.

Yes, if it's muddy looking I would do it. This is something that is
neglected by a lot of people. Will save your abs system if done on
time.

The tire pressure listed on the tire is the maximum that the tire will hold
safely.  The tire pressure listed in the owner's manual/door frame/glove
compartment is the automaker's recommendation.  The automaker's
recommendation is usually geared towards a combination of ride comfort and
handling.  I always recommend that people inflate their tires 4 or 5 PSI
over the automaker's recommendation to improve tire tread life and fuel
economy, at the expense of a slightly harsher ride.

There is no automaker's recommended brake fluid replacement interval,
however, brake fluid absorbs water over time, and the water can corrode
internal brake parts and diminish the fluid's ability to dissipate heat.  I
recommend replacing the brake fluid every over brake lining replacement, or
about 80,000 or 90,000 miles.  The correct brake fluid level is somewhere
between the max and min marks on the brake fluid reservoir.  The color of
the fluid should be like cooking oil.  If it appears to be black, then it
should be replaced, but it is not an emergency thing.

If you have 4 jack stands and an 8 mm open end wrench, then replacing brake
fluid is a relatively easy task.  You can re-post here for instructions if
you would like to save some money and do it yourself.

What is listed on the tire is a maximum allowable pressure -- not the pressure
that is correct for YOUR application.  The pressure for a 3,000 pound micro is
surely not the same as that needed for a 7,000 pound beast.

+                Bass: without a local chorus at the moment                   +
-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

I don't know, but I change mine every two years, and it turns very
dark in less than a year because of water absorption, even though I
live in Phoenix rather than in a humid climate. If I had ABS I'd
change it every 1-2 years because some ABS parts are very expensive.

From http://www.michelinman.com/care/tip1.html :

Recommended Pressure
Always inflate your tires to the recommended pressure listed by your
vehicle's manufacturer. This information can be found in the owner's
manual and often on a placard located in the vehicle's door jamb,
inside the fuel hatch, or on the glove compartment door.

From http://www.goodyeartires.com/faqs/Inflation.html :

How much air should I put in my tires?
Proper inflation is the single most important part of tire care. The
inflation pressure on the side of the tire is the MAXIMUM operating
pressure. It is not necessarily the right inflation for your vehicle.
Always use the inflation recommended by the vehicle manufacturer. You
can find it in your owner's manual, posted on the edge of the driver's
door, on a door post or on the inside of the glovebox door. Always
check inflation when tires are COLD: when the vehicle has been driven
less than a mile or one hour or more after driving. Use a good quality
tire gauge. Note: It's natural for radial tires to have a slight bulge
in the sidewall at their proper inflation pressure. Check or adjust
inflation every few weeks, before any long trip or if traveling with a
heavy load. And don't forget to check the spare. Your Goodyear
retailer can answer any questions you may have about tire inflation.

From http://www.tiresafety.com/maint/maint_ipressure.asp (this is a
site linked from Firestone's home page):

Inflation Pressure
Proper inflation pressure is essential for achieving maximum
performance and mileage. Improper tire inflation pressure can cause
severe internal tire damage, which can lead to sudden tire failure and
resulting in serious personal injury or death.Improper inflation
pressure may result in rapid or irregular wear. Pressures should
always be checked when the tires are cold and at least monthly. Under
normal tire operation, approximately 1psi of tire pressure will escape
every month. Also, for every 10 degrees F change in ambient
temperature, tire pressure will change by approximately 1psi.

Vehicle manufacturers list recommended tire pressures for original
vehicle tires in the owner's manual or on a placard on the end of the
driver's side door or in the glove box.

For continuous high speed driving, tire pressures should be increased
by 3 to 5psi above the normal cold inflation recommended. However, for
passenger tires, never exceed the maximum inflation pressure molded on
the sidewall. The inflation pressure for light truck tires may exceed
that molded on the tire by 10psi. Any recommended front to rear
pressure differential should be maintained.

From
http://www.conti-online.com/generator/www/us/en/continental/automobile/themes/co
ntiacademy/drivers_ed/nitrogen.pdf

Tires are designed and built to provide many miles of excellent
service but must be maintained properly. The key element of proper
tire maintenance is maintaining the recommended tire inflation
pressure. The proper tire inflation pressure is recommended by the
vehicle manufacturer and can be found on the vehicle's tire placard or
in the vehicle owner's manual. Continental Tire recommends that the
consumer check his/her tire inflation pressure at regular intervals of
at least once per month and before every long trip or twice per month
depending on local regulations, customs, or conditions.

From http://www.coopertires.com/Flash/index.aspx :

It's important to have the proper air pressure in your tires, as
underinflation can lead to tire failure. The "right amount" of air for
your tires is specified by the vehicle manufacturer and is shown on
the vehicle door edge, door post, glove box door, or fuel door. It is
also listed in the owner's manual.

You did not say how old your vehicle is. Toyota (like many other
manufacturers selling vehicles in the US) does not recommend routine
brake fluid replacement. I've seen numerous articles that indicate
this is not required. However, I usually have it done every three
years or so. As long as the brake system is properly maintained the
brake fluid has only minimal exposure to water and should be OK for
many years. However, some water will eventually enter the system and
this will lower the boiling point of the brake fluid and promote
corrosion in the system. I think it is worth having the fluid changed
out to minimize the amount of water present. On the other hand, I know
plenty of people who have never had the brake fluid changed and never
had a problem. As long as your mechanic knows what he is doing,
changing the brake fluid won't hurt anything and it may prolong the
life of your braking system. Plus if you are in an area with a lot of
mountains, I think it is a good idea.