Brake Fluid: Testing and Inspection

Maximum cleanliness is essential to prevent the entry of dirt into the system when topping up the master cylinder and carrying out similar operations. Use only fresh, new fluid. Fluid drained from the system, for example when bleeding the brakes, must not be re-used. Even top-quality brake fluid will deteriorate gradually due to absorption of moisture and minor impurities after a long period of use. Compared with new fluid, a brake fluid which has deteriorated is recognizable by its darker or altered color, relative lack of odor and watery appearance. The fluid should be replaced if any of these signs are present. The recommended brake fluid replacement interval is every second year or 30,000 miles.