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On my last ride I overheated my rear brakes on a KTM 300 on a steep decent, to the point that they stoped working, should I be replacing the brake fluid now if the system got that hot, how often dose brake fluid need replacing anyway, could somebody give me some advice

Yes you should but get some motul 600 it has one of the highest boiling points of any brake fluid about $30 odd dollars for 500ml but well worth it.

I replace my brake fluid every 12 months.
Using Penrite SIN brake fluid in the Berg.

Hey mate, yea your brake was a bit warm after that decent. LOL But it did come good as it cooled.

I would replace the fluid anyway, I do mine every 12 months. Make SURE you get the correct DOT rating for your KTM brakes, its in your manual & on the sticker RH side of your handle bars. It is CRITICAL!

Then change to whatever good fluid you like, plenty of great ideas posted here. I use the OEM suggest fluids. But thats up to you.

Also as you had plenty of pads, pull them out & deglaze them. Easy done but rubbing the pad (friction material side) face down on concrete in a firm circular motion. Not too much just enough to clear the glaze off the pad. Refit & REBED the brakes it is sometime like putting new pads in after a deglaze & you will be in for a shock if you rely on the rear brake in an emergency if you didnt bed the pads.

Cheers Pete

On the rear OEM pads on a KTM there's a kevlar backing plate to minimise heat transfer from the pads to the brake fluid. Have you changed to aftermarket pads and not reused the kevlar backing plate ?

stop using them so much

If all of the above fails - FOUR STROKE = ENGINE BRAKING

thanks guys,