ACDelco 10-4086 DOT 4 Hydraulic Brake and Clutch Fluid

ACDelco 10-4086 (GM part 19299570) is the OEM DOT 4 brake and hydraulic clutch fluid for GM vehicles, manufactured by Pentosin in Germany. DOT 4 requires a minimum dry boiling point of 446°F and wet boiling point of 311°F per FMVSS 116. This product documents 509°F dry and 338°F wet in the manufacturer PDS, giving a 63°F dry margin and 27°F wet margin above the spec floor. The wet boiling point is the operationally relevant figure: brake fluid absorbs moisture in service, reducing heat resistance over time. At 338°F wet, the margin is solid for daily-driver and light-performance use.

Best for GM vehicle owners (Corvette, Camaro, Silverado, and others specifying DOT 4) who want the OEM fluid backed by a documented boiling point. The 16 oz bottle is sized for a top-off or single-caliper bleed; a full system flush on most vehicles requires multiple bottles. Skip if your vehicle specifies DOT 5.1 for high-performance duty; higher dry boiling points are available at this price point.

The SDS signal word is DANGER, driven by H318 (can cause permanent eye damage) and H361d (suspected reproductive harm). Wear safety goggles during pour and caliper bleeding, where splash is possible; SDS §8 specifies eye and face protection. Gloves are appropriate for extended drain-and-bleed sessions. No respiratory protection is required for open-garage work; unventilated enclosed spaces warrant ventilation. A Prop 65 reproductive harm warning appears on the back label. The sweet taste of brake fluid is a documented attractant for pets and children; store sealed and out of reach. Drain-destined; collect spent fluid for disposal at an auto parts store.