Locks brakes on one side of trailer when off

Question edited for all the typos and translated into written English.
Question moved to model category.

https://www.google.com/search?q=2004+Chevy+Avalanche.+My+brake+pedal+is+locked

You sound competent enough to figure this out.

Fluid level is too high in reservoir
Caliper slide pins are seizing up
Brake pads are binding in caliper
Brake pedal push rod is out of adjustement
Brake pedal light switch switch is out of adjustment and constantly pressing slightly on the pedal

Hi, the instructions may be confusing. You need to hook the sense wire to the cold side of the stoplight switch--not the stop lamps. The stoplight switch is above the brake pedal. Am I making sense?

the specific wire for that bulb or one of the plugs is bad/corrosion in the plug

No controller should energize the trailer brakes without a signal from the brake pedal switch. Something is not right.

It sounds like the electric brake (Blue Wire) from your truck is in the wrong location in the socket from your truck

or

check the connection to the brake pedal it has a wire that goes to it(Usually) white or red it may be connected to the wrong side of the switch

one side has power at all times the other only when you hit the brake most likely this is the problem. the wire needs current only when the truck brakes are depressed.................Good Luck

dosen't stop at all or just slow?, if the abs is working then you should feel the pulseing in the brake pedal just before tire lock-up, the tires will not lock-up with abs fully funtioning unless all four tires or two are in lock-up depending on the abs application, if abs fails it reverts it self to regular braking ability, hope this helps

I found the problem. Talking with a technician from the controller company, we determined that it was a fuse problem. I found that the fuse to the CHMSL was blown.