When you released the emergency brake, it released the brakes, but possibly didn't release far enough to re-engage the track drives.If it was adjusted so it engaged both brakes evenly, both would be in the "neutral" position, so to speak. Theoretically, when you pulled the parking/emergency brake, you disengaged the track drive on both sides, to the point of engaging the brakes to hold you back. Just make sure there is slack where the cable attaches to the slave cylinder connection, and is fully released. In my mind, whatever the connection is, between the brake slave cylinder, and what disengage's the drive on the track at the 1/3-1/2 way point, is stuck in that position, to disengage/kill the tracks. It's been nearly 16 years since I've been around that stuff, but do recall numerous lines on the block, the shift levers attach to. The 450C had dry brakes, and if we'd been working creek channels, brake expander mechanism's would get rusty, and make the brakes grabby It'd make a mess of a nice looking job, locking one track, even when you were trying to just feather it. 1/3, to 1/2 way, would disengage the track drive, and let it freewheel somewhat on that side, while the other side was still being driven, and you could make a nice gradual turn. That being said, when operating the 450C, or 850E we had at work, when working a slope, we'd use reverse steering while backing down the slope, to move over for the next pass. Not that it's holding the brake, but rather holding, if I remember right, the slave cylinder, and not releasing far enough to engage the track drive. I'd have to guess your parking cable isn't fully released where it makes it's connection on the lower end.
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