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Brake Fluid for commercial Vehicles
For the vast majority of vehicles, a single fluid - brake fluid - is used in both the clutch and brake reservoirs. Check the cap of your clutch fluid reservoir - it should indicate if you need a special fluid.
Brake fluid should be changed every 1 or 2 years. Over time, moisture diffuses into the fluid through brake hoses and rubber seals, increasing the water content. If your brake fluid is low, you probably have a problem such as a leak. Leaks and excessive moisture in the fluid can both result is a loss of hydraulic pressure and braking ability, so it's as well to check and change your fluid periodically.
You can find which DOT your vehicle requires, normally in your handbook. However if you're not sure, or you have a unique or race vehicle contact the Opie experts for Brake Fluid advice.
Castrol Brake Fluid Dot 4 (Formerly Response Dot 4) Brake Fluid is formulated from mixed polyalkylene glycol ethers together with carefully selected additives. These enable the fluid to operate at a high performance level throughout its service life, offering system protection together with ultimate braking confidence.
Castrol React Performance Dot 4 (Formerly Response Super DOT 4) Synthetic Brake Fluid is a high boiling synthetic brake fluid which far exceeds the requirements of the SAE J1703, FMVSS 116 DOT 3 and 4, ISO 4925 and JIS K2233 specifications
MAINTAIN DOT 5.1 is a synthetic high performance brake fluid, which meets the requirements of DOT 5.1. Therefore MAINTAIN DOT 5.1 offers excellent protection against vaporisation even under severe conditions.
Millers Universal Brake Fluid DOT 4 is a high boiling point brake fluid meeting current requirements of SAE J 1703 and FMVSS 116 DOT 4 and is suitable for all braking systems where a non-mineral fluid is required.