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AP Radi-CAL R3 Racing Brake Fluid

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Formerly branded as AP PRF.

AP Radi-CAL R3 far exceeds DOT 4 specifications. It has been formulated and refined specifically for racing use where very high temperatures cause other fluids to boil. R3 is less viscous than standard fluids to make bleeding easier. Improved moisture resistance reduces the rate of water absorbtion, and a new corrosion inhibitor (not present in AP PRF fluid) makes R3 compatible with magnesium components.

To ensure that the fluid stays fresh during shipment, AP brake fluids are furnished in 1/2 liter (16.9 oz), easy-pour plastic bottles with double-sealed caps. Bottles should always be tightly resealed to keep moisture out.

AP Radi-CAL R3 Specifications:
DOT Rating - 4
Dry Boiling Point - 608°F
Wet Boiling Point - 399°F
Compatible with other fluids - Yes*
Container - 16.9 fluid ounce (500ml) plastic bottle
* For best results, fully drain any other fluid from the system, purge with R3, then fill with fresh R3.

Note: Due to import restrictions, we are not able to ship this product to Mexico.

Enter desired order quantities below, then click the "Add selected quantities to cart" button.

Order Qty
Part No.

3338-17 OZ
Condition: New

AP Radi-CAL R3 Racing Brake Fluid - 16.9 oz. bottle

1 to 19: $29.99

20 & up: $27.79

In Stock
Related Product Groups
Racing Brake Fluid

This or SRF no other choices


Find a product that works and stop looking. Years ago a brake engineer recommended PRF brake fluid or SRF. He said that both were tested independently and stand up to the stresses of racing much better than other types of brake fluid. My mechanic used another brand once and I noticed a difference. PRF is not the cheapest nor is it the most expensive brake fluid you can buy. But for the money it cannot be beat.


Rochester, NY


Depend on it


It's very simple. If you use this product you will enjoy high speed, high performance breaking.


Watkins Glen NY


AP Radi-CAL R3 Racing Brake Fluid

5.0 2