When operating a vehicle with a trailer and frequently traveling on mountain roads, the brake fluid must be replaced every 15,000 km.
We pump out the old liquid from the tank using a syringe or a rubber bulb.
We pour new liquid into the tank.
We bleed the brake hydraulic drives (see Bleeding the hydraulic brake system) and clutches (see Bleeding the clutch hydraulic drive) until the new liquid (lighter than the old one) will not start to come out of the bleeding nipples of all working cylinders. After bleeding the brakes and clutch, bring the fluid level in the tank to normal.
Use the brake fluid recommended by the manufacturer. Otherwise, the brake and clutch hydraulic drives may fail.
The article was borrowed from the website: CHEVYMAN