AS-400P H.D. BRAKE FLUID 12oz | Prestone DOT 3 synthetic hi-temp brake fluid is designed to provide an extra margin of boiling point protection. The mix of polyglycol ethers ensures hot brake-system operation will not create dangerous vapor. This delivers braking power when needed by avoiding a spongy pedal. Both wet and dry boiling points exceed the minimum government standards. A comprehensive inhibitor package protects vital brake system metals.