As mentioned above, there is a danger of air bubbles in the liquid. But not only this makes it necessary to replace the brake fluid. Water entering the fluid causes corrosion in the brake cylinders and pipelines. When changing the fluid, proceed as when pumping. You will need 2 liters of fresh brake fluid.
Suck off the old brake fluid from the reservoir with a pipette or a clean injection syringe.
Fill with fresh brake fluid and top up periodically.
Each valve must have 500 cc of brake fluid pumped.
Thanks to this relatively large amount, you can be sure that the new brake fluid will not be mixed with the old one, and the brake system will only be filled with fresh fluid.
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