Thoughts
I would recommend the Sealey VS820 , the only issue with these is checking that the supplied adapter fits the br fluid reservoir on your car, ,makes for a very stress free way to purge the old fluid, dot4 probably your fluid, you can buy it in 4L cans from most ppl like eur cp so no chance of running out. You can also get some low cost pen like testers that will give you an idea what % water in your current fluid, but might be worth drawing aome fluid off from the caliper end as well as the master cyl. Post some info on what car you have or a pic of the br fluid reservoir if you want to check if the vs820 fits yours.
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