I purchased a 9n runs well, tires good. I am a rookie at fixing it up but would like a winter project. My question is this, when I bought it the owner said he changed the hydraulic fluid and felt he might have over filled. The hydraulics and brakes worked when I purchased this a year ago and it sat since then. Problem the brakes don't work and I can not get the lever to engage the hydraulics to move. It looks like there is fluid leaking around both wheel drums and in checking the fluid level it is low. My question is where do I start? Pull wheels? pull hydraulics? Need guidance, thank you.