Zetor 3320 brakes locked up

[Azulon]

I used my 3320 for light work today and the brakes were normal. After hooking up a bush hog (single hydraulic for deck height), the brakes seized up. Tractor won't roll in neutral, and I saw smoke near the bleeder screws and brake pedals are completely stuck. Any ideas what could've caused this?

 

[c0rbinblue]

I used my 3320 for light work today and the brakes were normal. After hooking up a bush hog (single hydraulic for deck height), the brakes seized up. Tractor won't roll in neutral, and I saw smoke near the bleeder screws and brake pedals are completely stuck. Any ideas what could've caused this?

Looks like hooking up the bush hog caused the brakes to lock up , probably because the brake valve or hydraulic lines got stuck or blocked. The smoke and stuck pedals mean the brakes overheated or fluid boiled. Check the brake valve and lines for issues, then bleed the system to clear any pressure before testing again

 

[ToxicHeart]

In addition to everything that @c0rbinblue said I would also check the fluid for contamination, meaning you'll need to flush the whole system and replace the fluid.

 

[Myanmar.king]

Could be a stuck brake valve or debris in the lines keeping pressure on. I'd let it cool, then crack the bleeder to see if fluid's trapped. If it frees up, you'll know it's hydraulic pressure, not mechanical binding.

 

[cretinh0pp]

Looks like hooking up the bush hog caused the brakes to lock up , probably because the brake valve or hydraulic lines got stuck or blocked. The smoke and stuck pedals mean the brakes overheated or fluid boiled. Check the brake valve and lines for issues, then bleed the system to clear any pressure before testing again

When bleeding the system, is there a specific order I should follow for the valves or lines? And would old hydraulic fluid cause this kind of issue too? I have a 2005 Zetor Proxima 65, and this also
happened right after I hooked up an old bush hog we hadn't used in years.