Hi, As my parking brake was not working when the Bobcat travelled forward Oldmachinist suggested I looked at the parking brake disc. I stuck a camera inside the front chaincase cover and took some photos. I got some great photos & the dics do seem to be damage so I think I will need to replace them. Is this a simple job I changed a drive motor on a early 543 once and swore I would never go back in a chaincase, how ever I would like to try this. Are the discs expensive? Thanks