My brother asked me to put on a mower drive belt and a hydrostatic drive belt on his cub cadet. No instructions in the owner's manual, said it was a job for the shop. I got the belts on no problem, but now at idle the mower wants to creep forward. Not sure what I need to adjust to stop the creep. Also, how do you adjust the brake on this riding mower? Model number is LTX-1040: 13WX90AS009: 4456910