Automotive braking systems rely on hydraulic fluid pressure to transfer the pressure that is applied at the brake pedal to the friction surfaces at the wheels. The fluid that is used is called “BRAKE FLUID”. This fluid must withstand a combination of extreme heat and pressure. The fluid that works best for both requirements has some drawbacks. The make up of the fluid attracts moisture. Since the system has to be vented to the outside air, after some time moisture will contaminate the fluid. The worst thing about moisture-contaminated fluid is that when it gets very hot from use it will boil. This can create a loss of brakes when you need them most. The other bad thing is that the moisture attacks the inside of the hydraulic system. This can lead to very expensive repairs especially if a vehicle is equipped with antilock brakes. Most modern manual transmissions have a very similar hydraulic system to work the clutch. The fluid for the clutch is very similar to brake fluid. It also attracting moisture and has the same drawbacks from contamination. For these reasons we recommend a brake fluid flush. And if equipped with a hydraulic clutch the same flush for the clutch system. We recommend this service be done about every 2 to 3 years.