2003 sportsman 500 brakes

Hello,
My 03 sportsman 500 is having issues with the brakes.

When parked, the front brake handle is stiff to squeeze and the brakes are working.

As soon as I start driving, the brake handle goes soft when I try to squeeze it and the brakes don't work in the front.

When I take my thumb off the gas and start slowing down, a few pumps of the handle will
stiffen the handle up again and atv stops fine.

When driving, I can squeeze the brake handle as much as I want and it won't stiffen up until I'm slowing down or stopped.

The rear brake had 2 broken bleed valves, so I replaced the whole caliper and bled the whole system.

I'm starting to think there is still air in there somewhere or that my front master cylinder is shot.

Just thought it was weird that the brakes only stop working when the atv is moving and seem to work fine when parked or slowing down.

Has anyone seen anything like this before? any ideas?

Thanks,

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Will get them switched and sell my megas locally.

Will report how they run when I can get the quad out next spring. Expecting less swamp performance and much better trail riding.

Will mount on stock wheels, they are ok to me and I'm saving the cost of new wheels.

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