Brakes
BRAKE FLUID
Brake fluid is a special oil designed to withstand very high temperatures.The most commonly used Brake fluid is DOT4 which is Hygroscopic. This means that it absorbs water. As the fluid becomes more and more contaminated with water the boiling point reduces (the fluid boils at 240c, water boils at 100c). When the fluid starts to boil as your brakes get hot, air bubbles will appear in much the same way as in a boiling kettle, and when air gets in the braking system your brakes will take much longer to operate and the foot pedal will become spongy. BEST Autocentres will check your brake fluid boiling point free of charge, when it boils at 180c or lower it will need to be pumped out and replaced.