To check the fluids, simply look at the see-through reservoirs. The brake and clutch fluid levels should be within 10mm (0.4in.) and 5mm (0.2in) respectively below each maximum level line.
It is a good habit to check these fluid reservoirs every time you check the engine oil level.
It is normal for the brake fluid level to go down slightly as the pads wear. So be sure to keep the reservoir filled.
If any reservoir needs frequent refilling, it may indicate a serious mechanical problem.

If the level is low, add SAE J1703 or FMVSS No. 116 DOT 3 brake fluid to the brake or clutch reservoir.
Remove and replace the reservoir covers by hand. Fill the brake fluid to the correct level when you put the cover back on.
Use only newly opened brake fluid. Once opened, brake fluid absorbs moisture from the air, and excess moisture can cause a dangerous loss of braking. Also, for this reason, you should have the brake fluid drained and replaced periodically.

CAUTION: Use caution in filling the reservoir, because brake fluid can harm your eyes and damage painted surfaces. If fluid gets in your eyes, flush your eyes with clean water

NOTICE:
If you spill some fluid, be sure to wash it off with water to prevent it from damaging the parts or painting.