Brake Fluid Flush
Every two to four years, you need a brake fluid flush done on your vehicle. Brake fluid is hygroscopic, which means it pulls in water right out of the air. Old brake fluid also has some wear particles in it that combine with the water to corrode the inside of your brake system. The factory has taken the brake fluid change out of the recommended major services because the fluid needs to be changed based on time interval instead of mileage. Each of our technicians has a tool to measure the amount of water accumulated, and when it reaches 3%, the brake fluid needs to be changed. H&B Karmakanix uses a Synthetic DOT 4 brake fluid that has a 5 year service life. It absorbs water from the air more slowly and boils at a higher temperature than regular fluid.
Any BMW, Mini, VW or Audi from this century with a manual transmission has a hydraulic clutch that uses the same fluid as the brakes. Accessing the bleeder valve can be difficult. Some shops either don’t know about the clutch fluid or just skip it. Clutch hydraulic failure is more common than brake hydraulic failure. Many clutch slave cylinders are inside the bell housing of the transmission. Failure to change the brake fluid in the clutch system can cost you a clutch job.