I would be asking why do I need to top up? The brake system should not loose any fluid. If it needs topped up that would indicate to me that you have a leak some where, have you noticed the level drop at all? Also I have never seen pink brake fluid maybe a specific manufacturer.... If unsure then replace the whole lot, flush through with dot 3 or dot 4 ( depending on what donor braking system you are using) and check for any leaks at the same time!
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