mx5cartalk.com

the black rubber seal/bushing that joins the reservoir to the master cylinder does have it's own mazda part number, but i don't know if they sell it separately. for the NA8 the part number is 49-686B, but i don't have a NA6 parts catalogue handy. perhaps simply try disassembling your unit and giving all the sealing surfaces a good clean and inspection?

to replace the whole unit:
http://www.mx5parts.co.uk/brake-master- ... p-795.html
sit down before ringing a local mazda dealership for a price.

you might want to get that firewall resprayed while you're there.

Sometimes the dealers are cheaper than the chain stores for that kind of stuff. I've found that with my other car for things like seals.

Hi mate, good to hear problems solved!
I'm running into the exact same issue. However on inspection when I changed my pads,
noticed the seal was broken so I know what I'm up against (I think).
Where and how much did you purchase your replacement seals?

nGtim.