Wilwood’s new XR Race-Only* brake fluid is the same extreme high-temperature fluid used in Formula 1, World Rally Championship, FIA World Endurance, and Moto GP. Laboratory testing indicates XR Race-Only fluid has a dry boiling point of 645° F thanks to a proprietary blend of high-performance polymer electrolytes and borate esters. This polyglycol-ether-based, DOT4 type brake fluid combines the lowest compressibility, lowest moisture affinity, and highest resistance to aeration of any brake fluid available. XR Race-Only Brake Fluid is formulated to deliver the absolute best, most consistent pedal feel, start to finish, even in the most adverse racing conditions. The premium metal 16.9 ounce can with an airtight safety seal ensures fresh, clean fluid upon opening. (* For off-highway use only. Not DOT approved.)
16.9 FL. OZ. (500ml) each.
Due to a high-performance brake system's extreme operating temperatures, standard parts' store brake fluid is not recommended. Never mix brake fluids of different DOT classifications.
Of critical importance is the brake fluid's dry boiling point - the temperature at which a brake fluid will boil in its virgin non-contaminated state. The minimum dry boiling point temperature is 401° F for DOT 3 fluid, and 446° F for DOT 4. All Wilwood brake fluids exceed these standards, with Hi-Temp° 570 rated at 570° F, EXP600 Plus rated at 626° F, and XR Race-Only at 645° F.
Moisture enters your brake system through condensation, weather, ambient humidity, or washing the exterior. Glycol-based brake fluids are hygroscopic (they absorb moisture), and over time the boiling point is gradually reduced. The DOT 3 minimum wet (roughly 4% water absorbed) boiling point temperature is 284° F, DOT 4 is 311° F. All Wilwood brake fluids exceed these wet boiling standards, with Hi-Temp° 570 rated at 313° F, EXP600 Plus rated at 417° F, and XR Race-Only at 432° F.
Whenever you add fresh fluid to your existing system, it immediately becomes contaminated, lowering the new fluid's boiling point. For maximum performance, use a high boiling point fluid and flush the system thoroughly. For street cars, flush and refill the fluid every year. For race or track-driven cars, it can be beneficial to change the fluid after every race weekend, especially after racing in the rain, severe temperature use, or brake fluid boiling.