Not only should you purchase the proper flare wrenches but you should buy good ones like Snap-on or Mac. The cheap ones tend to spread under load and are worse than useless.
You're going to need them when you flush your brakes every two years so you might as well spend the money on the right tools now. You can start with the 10-12mm and 11-13mm wrenches and build from there as needed if you don't want to buy a full set right away. Good used Snap-on flare wrenches are fairly common on ebay.
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'99 black 986
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