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Brake Fluid FAQs

FAQsMaintenance TipsDIY Video
 What is DOT?

The difference between the DOT (Department of Transportation) ratings of brake fluid are the boiling point ranges that they achieve both dry (no water absorbed) and wet (about 3-4% water content). For DOT 3 the dry boiling point is at least 401 and the wet 284 degrees. DOT 4 raises the bar to 446 and 311 respectively.

Minimal boiling points for these specifications are as follows (wet boiling point defined as 3.7% water by volume):

  Dry Boiling Point Wet Boiling Point
DOT 3 205 °C (401 °F) 140 °C (284 °F)
DOT 4 230 °C (446 °F) 155 °C (311 °F)

Prestone Brake Fluid is a scientifically compounded and chemically balanced formula with a high boiling point of 260°C. It exceeds the performance requirements of DOT 3 (205oC) and military brake fluid specifications.

It is formulated to provide safe, dependable performance in the hydraulic brake system of your vehicle for long periods of time and under a wide range of operating conditions.

Prestone Brake Fluid has an edge over other brands in the market because it has passed and exceeded the DOT 3 specification on ERBP (Equilibrium Reflux Boiling Point). Since Prestone has a high boiling point, it means that it does not easily boil even under extreme temperatures.

 Why is boiling point important in Brake Fluid?
Over time, brake fluid deteriorates in use because it absorbs moisture from the atmosphere. The excessive amount of moisture absorbed will boil the fluid at lower temperature due to heat generated during frequent braking action. This can also cause vapor lock, which affects your braking system. It also makes the fluid less reliable in hard braking efficiency and emergency conditions. Prestone Brake Fluid prevents this from happening because of its high boiling point.
 What is recommended boiling point for a safe brake system?
The recommended boiling point for a safe brake system is at 230°C. When the boiling point of your brake fluid reaches 180°C - 200°C, we recommend that you top-up to replace the contaminated brake fluid. In the event that you reach 180°C and below, we advise that you flush out the old brake fluid and fill up your system with fresh brake fluid. The recommendations mentioned are based on all brake fluid manufacturers via Federal (FMVSS-116), DOT (Department of Transport) or SAE (Society of Automotive Engineers).
 What is Vapor Lock?
While brakes work, it creates friction that causes heat. The heat creates vapor and excessive moisture that will form bubbles inside the brake lines. This will create air spaces in between which your brake pedal will feel “spongy”. Hence, vapor lock is a kind of brake failure due to vapor formation. In some cases like during hard braking, the pedal can go straight to the floor without any braking action at all.
  How do you prevent vapor lock formation?
Regular car maintenance, changing of your brake fluid, and getting into Prestone Brake Fluid “Flush & Fill” habit as opposed to merely topping up will help prevent vapor lock formation and ensure your safety every time you drive.
  How often should I change my brake fluid?
If you check the owner’s manual of year 2000 and up model vehicles, you’ll find that car makers are recommending brake fluid changes every 24 to 36 months or every 40,000 kilometers drive. However, technical experts recommend to top-up regularly and change the brake fluid (flush and fill) once a year after completing the warranty period.
  What is Prestone Brake Fluid “Flush & Fill” habit?
The Prestone Flush & Fill habit is a brake system maintenance of changing the brake fluid once a year instead of regularly topping-up with old brake fluid. It is a maintenance habit wherein you drain your old brake fluid by bleeding and replacing it with Prestone Brake Fluid. Through this, it will help protects your brake system from corrosion and will avoid you from costly repairs.
  Who can I contact for wholesale, dealer, or retail of Prestone?
Please get in touch with us through this Contact Us Form.
 Where can I buy Prestone products?
You can go to the nearest Auto Supply outlet or check our Where to Buy for a list per area. Prestone products are also available in select Ace Hardware, The DIY Shop, Handyman, Blade, True Value branches and Seaoil Stations nationwide.