Many riders with DOT 4 in their brakes will opt to bleed with DOT 5.1 to benefit from the higher boiling point and improved heat resistance. Others including Avid and Hope, choose to use DOT 5.1 in their brakes. Some brake manufacturers, such as Hayes and Formula, pre-fill their brakes with DOT 4 brake fluid from the factory. By mixing DOT 3, 4 and 5.1 brake fluids, assuming it is fresh fluid, the worst thing that can happen is a drop in the boiling point of the whole fluid. BRAKE FLUID DOT 4 is an advanced hydraulic brake fluid with superior characteristics providing maximum safety even if operating under particularly heavy. Here you can see that silicone based DOT 5 is the odd one out and is not compatible with any other DOT brake fluid. So just which brake fluids can you mix without causing harm to your brake system? Let's take a look at the chart below. It is important never to mistake DOT 5.1 (glycol-based) with DOT 5 which is silicone-based and should never be mixed with any other DOT fluid. Since DOT 4 and 5.1 are both glycol-based brake fluids they are compatible with each other, which means they can be readily mixed without harming your brake system. Brake fluid manufacturers can and often do improve on these figures and it is possible to find DOT 4 brake fluid with a higher boiling point than some DOT 5.1 fluids on the market. Remember, these are only the minimum standards. Let's take a look at the minimum boiling temperatures of DOT brake fluid as specified by the Department of Transportation. These are the minimum temperatures that the brake fluid must perform at before the brake fluid starts to boil, which can lead to complete brake failure. Part of the standards that need to be met by the manufacturers of DOT fluids are the minimum dry and wet boiling points. The main difference between these two brake fluids is in their boiling points. They are controlled by standards set out by the Department of Transportation (DOT) - hence the name. Pentosin 1204116 Corrosion Resistant Super Dot 4 Brake Fluid 1 Liter. Maxima Racing USA 80-87916 DOT 4 Racing High Temp Brake Fluid, Single. Brake Fluid (3 Pack) LUCAS OIL 10827 Brake Fluid12 ounce. DOT 4 and DOT 5.1 are both glycol-based brake fluids and are used widely in the automotive and cycle industry. Motul 101667 RBF 660 Dot-4 100 Percent Synthetic Racing Brake Fluid - 500 ml.
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