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Brake Fluid Comparison | DOT3, DOT4, DOT5

The three main types of brake fluid now available are DOT3, DOT4 and DOT5. DOT3 and DOT4 are glycol-based fluids, and DOT5 is silicon-based. The main difference is that DOT3 and DOT4 absorb water, while DOT5 doesn't. One of the important characteristics of brake fluid is its boiling point. Hydraulic systems rely on an incompressible fluid to transmit force. Liquids are generally incompressible while gases are compressible. If the brake fluid boils (becomes a gas), it will lose most of its ability to transmit force. This may partially or completely disable the brakes. To make matters worse, the only time you are likely to boil your brake fluid is during a period of prolonged braking, such a drive down a mountain -- certainly not the best time for brake failure!

Endless RF-650 Racing Super Fluid 

 Endless RF-650 Racing Super Fluid 

 $42.00 
 EL.S-FOUR.BF 
Endless S-FOUR DOT-4 Brake Fluid 

 Endless S-FOUR DOT-4 Brake Fluid 

 $40.00 
 847205 
MOTUL RBF 660 Racing Brake Fluid DOT 4 

 MOTUL RBF 660 Racing Brake Fluid DOT 4 

 $31.75 
 8068HL 
Motul RBF600 Synthetic DOT 4 Brake Fluid 

 Motul RBF600 Synthetic DOT 4 Brake Fluid 

 $20.99 
 STI60419830001 
STi Brake Fluid Subaru BRZ 13+ 

 STi Brake Fluid Subaru BRZ 13+ 

 $59.03 
 TORQUE-RT700 
Torque RT700 Racing Brake Fluid 

 Torque RT700 Racing Brake Fluid 

 $33.95 



As a DOT3 or DOT4 brake fluid absorbs water, its boiling point decreases. It can absorb water from the air, which is why you should avoid opening your car's brake fluid reservoir. For the same reason, you should always keep containers of brake fluid tightly sealed.

DOT5 fluid does not absorb water. This means the boiling point will remain relatively stable, but it also means that any water that does get into your brake system will tend to form pure water pockets, which could cause brake corrosion.

Two other important things about brake fluid: DOT3 and DOT4 eat paint, so don't spill it on your car. Also, none of the different types of brake fluid should be mixed. They can react badly with each other and corrode your brake system.

We highly recommend Motul RBF600 DOT4 Synthetic Brake Fluid for your performance vehicle.  This DOT4 works great in track cars under all conditions and will even improve your braking on your street car as well.