Find out more about "brake fluid" brake fluids are DOT worldwide
divided into classes . There are two major groups that need to be distinguished.
- polyglycol brake fluids which are basic standard in Europe (DOT 4, DOT 5.1)
- silicone oil rather basic brake fluids which are standard in the U.S. (DOT 5). (The only manufacturer that requires DOT 5 brake fluids in Europe, Harley Davidson.)
>> Expert tip: Do not use other brake fluids (DOT 4, ect 5.1) with brake fluid DOT 5 mix!
>> In systems for which a DOT 5 brake fluid is required, you should only fill it, otherwise seals can be damaged and this can lead to brake failure.
The normal brake fluids have boiling points (vapor bubble point): DOT 3: 205 ° C
DOT 4 230 ° C
DOT 5.1: 260 ° C according
wet boiling points
. DOT specification are classified as follows: DOT 3: 155 ° C
DOT 4 170 ° C
DOT 5.1 180 ° C
• DOT 3 brake fluids are miscible, DOT 4, DOT 4 and DOT 5.1 + should, however, a mixture of different brake fluids always be avoided
• You can brake fluids with specifications DOT 3, DOT 4, DOT 4 and DOT 5.1 + in all systems for Fill one of these specifications is required
• What is a "wet boiling point"? The wet boiling point is at 2% water content measured in the fluid (so to speak for used brake fluid).
• What is a "dry boiling point"? - The dry boiling point is measured using a new brake fluid.
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brake fluid is hygroscopic , that brake fluid draws water from the humidity. The more water content, the brake fluid has, the faster "cooks" them. This creates air bubbles. The braking effect will be severely affected. It comes to the so-called "fading".
SAFETY FIRST! • Brake fluid is an important safety item in your vehicle!
• brake fluid needs changing in time (Dampfblasenpunkt!) - see manufacturer's instructions
(Source: Castrol)
