AP Racing Radi-CAL R3 /PRF 660 Racing Brake Fluid
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AP Racing R3 PRF660 Racing Brake Fluid

PRF 660, Re-branded as Radi-CAL™ R3 - Silver Bottle with Yellow cap. R3 developed for use in high-temperature racing conditions. Conforms to and exceeds FMVSS 116 DOT 4 and SAE J1703 and J1704. There have been no formula changes, just a newer looking label, and a different part number.

$29.95 (tax incl.) $29.95 (tax excl.)
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FREE shipping on orders over $99.99* Details

AP Racing PRF/R3 Racing Brake Fluid

 AP Radi-CAL R3 is now in a Silver Bottle with a Yellow cap, but for years was labeled as PRF 660. R3 developed for use in high-temperature racing conditions. Conforms to and exceeds FMVSS 116 DOT 4 and SAE J1703 and J1704. There have been no formula changes, just a newer looking label, and a different part number.

This was an (AP PRF 660) Blue Bottle with Yellow Cap now (AP Radi-CAL R3) Silver Bottle and Yellow Cap.

AP PRF 660/R3 Details:

  • Manufacturer: AP Racing
  • Manufacturer PRF660 part number: 5660
  • Manufacturer R3 part number CP5660
  • UPC: 848238040081 (this did not change)
  • DOT Rating - 4 (this did not change)
  • Dry Boiling Point - 608°F (this did not change)
  • Wet Boiling Point - 399°F (this did not change)
  • Compatible with other fluids - No (this did not change)
  • Container - 16.9 fluid ounce (500ml) plastic bottle (this did not change)

Designed to perform at the highest levels of Professional Auto and Motorcycle Racing- AP PRF 608 Racing Brake Fluid exceeds DOT 4 specifications. To ensure that the fluid stays fresh, AP brake fluids are furnished in 1/2 liter (16.9 oz), easy-pour plastic bottles with double-sealed caps.

AP Racing PRF is currently one of the most popular brake fluids at the highest levels of professional auto and motorcycle racing.  PRF was specifically developed for coping with extraordinary temperatures, such as those encountered when running a carbon/carbon brake system.

Although PRF isn't advertised with the absolute highest boiling point numbers on the market, independent laboratory testing and trackside data collection have confirmed that AP PRF outperforms competing products when temperatures rise.  Don't trust overinflated numbers slapped on a label, trust the product that has delivered countless victories at all levels of racing.

When switching your fluid to AP Racing PRF, DiscoveryParts recommends purging all of the old fluid from the system via a manual bleed.  Most of our customers find that three bottles of fluid are enough to completely replace their existing brake fluid and still have enough left over for a bleed at the track to remove any remaining air bubbles.

'Typical' New Dry Boiling Point - 320°C (608°F)
'Wet' E.R. (Equilibrium Reflux) Boiling Point - 199°C (399°F)

Is the now bottled and labeled as

AP-CP5660
848238040081

Free Shipping 

Any order to the contiguous 48 states that is $100.00 or greater will receive FREE ground shipping . Not included are oversize items (some seats/fuel jugs) or if stated in the item description. 3 day, 2 day, overnight, and weekend overnight shipping are available. However, if your order qualifies for "Free Shipping" and you later return the item/items on that order for a refund, you must pay for the free shipping you received on that order before any refund will be issued. Return shipping is the responsibility of the buyer. If it is difficult for you to visit a shipping facility to arrange for return shipping, we will gladly send you a return label for your convenience. Return labels will be offered for a minimum of $20. The weight and size of the return will determine the final return price. Items must be returned to us new, unused, and in the original packaging. Shipping charges incurred on any order are non-refundable upon return of the item(s). Exemption: If product was opened but later deemed defective) If you have any questions, please call any member of our sales staff @ 1-888-748-RACE.

Alaska, Hawaii and any other delivery address beyond the 48 contiguous shipments will have additional shipping charges, We will contact you with pricing and delivery options.

Return Policy 

We want our customers to be safe and have the exact pieces they want. We know how hard it is to find the exact fit for your helmet, suit, gloves, shoes, etc. Our simple return and exchange options are below.

  • 1-30 Days after delivery to you: Full refund or Exchange
  • 30-45 Days after delivery to you: Exchange
  • 30-45 Days after delivery to you: Refund minus 15%
  • 45+ Days after delivery to you: No returns or exchanges allowed

Items must be returned to us new, unused, and in the original packaging. Products returned must include all original packaging and exterior box. (Exemption: If product was opened but later deemed defective. If an item is deemed to be defective within 30 days of purchase, DiscoveryParts will replace it with an identical item or a full store credit will be issued upon arrival of the return. Please make sure to thoroughly inspect the purchased product before using it and ensure the user of the product is familiar with the correct application and proper care)  If you have any questions, please call any member of our sales staff @ 1-888-748-RACE

*Please note: NOT ALL ITEMS ARE RETURNABLE. No returns or exchanges will be accepted on final closeout items. 

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