| The term boiling point when used regarding brake fluid means the temperatures that brake fluid will begin to boil.
WET BOILING POINT
The minimum temperatures that brake fluids will begin to boil when the brake system contains 3% water by volume of the system.
DRY BOILING POINT
The temperatures that brake fluid will boil with no water present in the system. MOISTURE IN THE BRAKE SYSTEM
Water/moisture can be found in nearly all brake systems. Moisture enters the brake system in several ways. One of the more common ways is from using old or pre-opened fluid. Keep in mind that brake fluid draws in moisture from the surrounding air. Tightly sealing brake fluid bottles and not storing them for long periods of time will help keep moisture out. When changing or bleeding brake fluid always replace master cylinder caps as soon as possible to prevent moisture from entering the system. Condensation (small moisture droplets) can form in lines and calipers. As caliper and line temperatures heat up and cool repeatedly, condensation forms, leaving behind an increase in moisture/water. Over time the moisture becomes trapped in the internal sections of calipers, lines, master cylinders, etc. When this water reaches 212¾F the water turns to steam. Many times air in the brake system is a result of water that has turned to steam. The build up of steam will create air pressure in the system, sometimes to the point that enough pressure is created to push caliper pistons into the brake pad. This will create brake drag as the rotor and pads make contact and can also create more heat in the system. Another way that moisture may enter the system is through diffusion. Diffusion occurs when moisture enters through rubber brake hoses. Using hoses made from EPDM materials (Ethlene-Propylene-Diene-Materials) OR steel braided brake hose with a non-rubber sleeve (usually Teflon) will greatly reduce the diffusion process.
Member # 54233 and The 4th Z32 Project.....Its time to do it all over again... |
