If you have too much brake fluid, it can spill on; the engine. The fluid will burn if the engine is ; hot enough. You or others could be burned, and - Page 264

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There are only two reasons why the brake fluid level in
the reservoir might go down. The first is that the brake
fluid goes down to an acceptable level during normal
brake lining wear. When new linings are put in, the fluid
level goes back up. The other reason is that fluid is
leaking out of the brake system. If it is, you should have
your brake system fixed, since a leak means that sooner
or later your brakes won’t work well, or won’t work 
at all.

So, it isn’t a good idea to “top off” your brake fluid.
Adding brake fluid won’t correct a leak. If you add fluid
when your linings are worn, then you’ll have too much
fluid when you get new brake linings. You should add
(or remove) brake fluid, as necessary, only when work is
done on the brake hydraulic system.

CAUTION:

If you have too much brake fluid, it can spill on
the engine. The fluid will burn if the engine is 
hot enough. You or others could be burned, and 
your vehicle could be damaged. Add brake 
fluid only when work is done on the brake
hydraulic system.

When your brake fluid falls to a low level, your brake
warning light will come on. A chime will sound if you
try to drive with this warning light on. See “Brake
System Warning Light” in the Index.

What to Add

When you do need brake fluid, use only DOT

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fluid. Use new brake fluid from a sealed container only.
Refer to “Recommended Fluids and Lubricants” in the
Maintenance Schedule.

Always clean the brake fluid reservoir cap and the area
around the cap before removing it. This will help keep
dirt from entering the reservoir.