Just been doing engine testing on my car and the brake line that runs to the back of the car from the MC passes about 3" away from the header pipes.....it gets HOT...

Is this an issue?

I was thinking about sleeving it in some of that space age type wrap......

Also the bottom of the brake servo is about an inch away from the headers...again, is this an issue?

Oh..the headers are wrapped!

Could be if you are sva'ing.I made a heatshield to protect my master cylinder and lines adjacent to headers.Tester said he would have advised it had he not seen it fitted.One of those grey areas I think

I would recommend covering it for safety's sake, just an ali cover allowing cool air to circulate round it but protecting it from the hot exhaust - I have something like this around wiring which runs quite near my exhausts, cost about tuppence & does the job a treat!

I'd go for stianless . It reflects the heat better rather than soaking it up like aluminuim.
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Brake fluid can absorb moisture and then when it gets hot the water boils and turns to vapour which isn't that good at operating the brakes. I think this water absorption is one reason why you should renew brake fluid every two years or so. Or so the people who make brake fluid say

Yes I would try to keep the pipes cool.

I used to fade the brakes on my manta with the XE 16v in it cos the brake pipes and bias valve were a bit near to the exhaust manifold, deffo shield them or better, put them elsewhere

i would make a little heatshield, it cant be good an it? Hotter brake fluid.