Let’s talk a little about brake fluids:
First, keep in mind that all brake systems will only work as well as their mechanical and hydraulic design will allow. Poorly designed brakes system, or an inadequate brake setup will cause the brake fluid to boil much faster. Brake fluid can boil inside the caliper causing bubbles to form, which leads to a “soft / mushy” pedal feel. In certain cases the pedal will fully depress to the floor and the only way to get the pedal to return is to pump the brakes.
For most of us, the boiling point is the most relevant factor when choosing which brake fluid to purchase. DOT 3 and DOT 4 are the most popular type of fluid and are both glycol-ether based, and can be mixed.
DOT 5 is a silicone based fluid that must only be used in a completely dry brake system and cannot be mixed with any other DOT-rated brake fluids.
When talking about brake fluid, the terms dry and wet boiling point are often mentioned. Dry boiling point refers to the boiling point of new fresh brake fluid from an unopened container. Wet boiling point is referred to the boiling point of the brake fluid after water has been absorbed into the system, which is typically 1-2 years under non-racing conditions. Under racing conditions, we recommend changing fluids often to ensure reliability and consistency.
As in most racing conditions, keeping things cool is important. Same emphasis should be put into brake cooling, which will help prevent any “Oh $hit” moments and most importantly ending your day at the track prematurely.
Which one is best for me?
We have listed below some of our more popular brake fluids to help choose: