there is a brake master on ebay, I got one from matt earlier this year. Just so you know its a reboxed mazda faxtory part and worth twice the starting bid.
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74 restorepu
that price is pretty high, but i guess worth it. It took me 3 tries and the associated shipping charges to get a new master.
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74 wankel panther 77 REPU
79 rx7
89 Vert