Fluid Recommendations
Use only DOT 3 or DOT 4 specified brake fluid from a well-sealed container. If you are unsure of the condition of the fluid (whether it was properly sealed or not), use a new one. It is very important that the fluid meets the specification so that the high temperatures generated by modern disc brakes do not cause the fluid to boil and reduce braking ability. For the same reason, the fluid should be free of moisture.
Checking the level
The brake master cylinder fluid level should be checked every few weeks for signs of a leak or low level. A sudden drop in level may indicate a leak in the system. The reservoir is located at the left rear of the engine compartment near the bulkhead and is made of plastic; the level can be checked by shining it through the light.
Normal pressing of the brake pedal causes a gradual decrease in the level. But in this case, the fluid is not absent; it has only redistributed within the system. If the drop is gradual, check the front brakes before adding fluid. If the system was filled before the new brakes were installed, the reservoir will overflow.
All Hondas have MAX and MIN lines on the brake fluid reservoir. The brake fluid should always be kept at the MAX line, but not above it. When adding brake fluid, take the following precautions:
1. Use only recommended fluids: DOT 3 or DOT 4; type SAE J 1703b HD.
2. Never reuse brake fluids or use contaminated, cloudy or air-bubble containing fluids.
3. Store the liquid in a clean, dry place in its container. Tighten the lid securely and do not puncture it.
4. Before opening, thoroughly clean any dirt around the master cylinder reservoir cap.
5. Be especially careful with liquid stains. The painted surface of the car can be damaged by brake fluid.
Clutch fluid
Manual transmissions on 1990-91 Accords and 1988-91 Preludes use a hydraulically actuated clutch system. When the clutch pedal is pressed to the floor, fluid is compressed and the clutch engages. Other cars use cable-actuated clutches.
The clutch fluid reservoir is located in the same area as the master cylinder reservoir. The clutch reservoir is difficult to see due to its smaller size. The fluid used here, checking and filling are completely similar to the brake fluid reservoir. Always wipe the surface of the reservoir before removing it. Periodic fluid compensation may be required as the clutch wears.
(Original article on the website hondabook)