Warning! Brake fluid is harmful to the eyes and to the car paint, so be careful when working with it. Do not use fluid that has been stored in an open container for a long time, since the fluid is hygroscopic and absorbs moisture from the air. Excess moisture in the brake fluid can significantly reduce the effectiveness of the brakes.
1. The procedure for replacing brake fluid is similar to bleeding the brakes, which is described in chapter 9. The only difference is that the fluid in the reserve tank should not be added, but on the contrary, removed using a syringe, a syringe or other device. Then you need to bleed all the brakes in turn, allowing the fluid to completely drain from the system.
2. Acting as indicated in chapter 9, unscrew the nipple to release air from the first brake cylinder and pump the brake pedal until there is almost no fluid left in the reserve tank.
3. Add fresh fluid to the reserve tank up to the MAX mark. Continue pumping the pedal until only fresh fluid remains in the tank and fresh fluid also flows from the nipple. Screw the nipple back on and add fluid to the tank up to the MAX mark.
4. Bleed the system through the remaining nipples in the same way until all the old fluid has drained. Don't forget to monitor the fluid level in the reserve tank and top it up with fluid as needed.
Old brake fluid is usually much darker than fresh fluid, so they are easy to tell apart.
5. Once the operation is complete, check that all the air bleed nipples are tight. Put the protective caps on them. Wash away all traces of spilled fluid and check the fluid level in the reserve tank again.
6. Before driving on a public road, check the operation of the brakes.
[Read the original source on the website: BMWMan.ru]