Purpose and Specifications

Castrol 15CD1A is a premium synthetic DOT 4 brake fluid in a 1-liter bottle, nitrite-free for safe use in modern braking systems. It meets top standards like FMVSS 116 DOT 4, ISO 4925 Class 4, JASO JIS K2233, SAE J1703, and SAE J1704, delivering reliable performance in cars, motorcycles, and light trucks.

This high-boiling-point fluid resists vapor lock up to 250°C dry and 165°C wet, preventing brake fade during hard stops or high-heat conditions. Its Low Moisture Activity formula fights water absorption better than standard fluids, keeping brakes responsive in cold weather down to -40°C with smooth flow. Superior corrosion protection extends component life, while compatibility with DOT 3/4 systems allows easy top-offs.

When to Use / Replace?

Use Castrol 15CD1A in disc/drum brakes, ABS, and hydraulic clutches exposed to demanding drives like towing, track days, or hilly roads. Ideal for vehicles needing DOT 4 performance, including VW, BMW, and Japanese models.

• Replace every 2 years or per manufacturer schedule to avoid moisture buildup and performance loss.
• Flush at 40,000-60,000 km (25,000-37,000 miles) under normal use, or sooner (20,000-30,000 km) for heavy braking.
• Check monthly: Dark, cloudy fluid means replace now for safety.

FAQ

Can I mix it with other brake fluids? Yes, fully miscible with DOT 3 or DOT 4, but for best results, flush and replace completely.

What's the shelf life? Up to 5 years unopened; use within 2 years once installed.

Is it safe for my ABS system? Absolutely, exceeds requirements for all ABS, disc, drum, and clutch systems.