No, if you are just changing your brake pads or shoes, you don’t usually need to change your brake fluid. It is always good practice to check your fluid level when you do change your bake pads. It should look clean and translucent. If your brake fluid looks murky and thick, it is probably time to drain it out and replace it with new clean fluid. This is done by bleeding the old fluid out of the system while replacing it with new fluid simultaneously.