Hot Brakes??

[goingnowherequickly]

Hi All
Hope someone clever can help me with some advice here...
I've noticed on a couple of recent rides, whilst going down a long steep pass ( 2 or 3 ks maybe),
that I'm losing pressure on the rear brake by the time I get to the bottom...
Luckily alls been fine - no offs 
Its been the type of surface where you cant use the front too much...
I presume the fluid is getting too hot to maintain pressure...
Anyone else get this ?
Is there a solution .. Perhaps its my riding style & I should be using engine compression more?
after a little while they cool again & brakes are fine...
Any advise?

 

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[Berty77]