I have a question.
When im biking down a mountain pass and want to brake I start to fishtail a little.
I use my front brake for my heavy stopping and i also try to put pressure on my rear wheel when i can. I know im not skidding my wheel.
Anybody have a suggestion as to what might be happening here?

Your weight is shifting forward, causing the rear wheel to lose traction. The use of the rear
brake in this scenario is making it worse.

Fishtailing implies a lockup at the back, which means it's skidding - I can't see how you can fishtail any other way in this situation.

why the fugg is this in the hipster forum?

i think youre right. I notice it happening when i dont back pedal at all too. should i apply more weight to the saddle?

cincinati kid? I suppose you're hear for the toronto kid then, eh?

DOn't know why I couldn't resist posting that.

my suggestion, don't hula hoop while leaning forward on your bike.

haha yeah i try not to... a lot harder on the turns tho

Yeah, and make sure you keep your weight way back. But I don't know the situation of your bike setup, tires also make a difference. Also, how steep are the trails you are riding?