If the pipes are corroded, I would NEVER sand them down and grease over them. For starters, I've heard of MOT places making you wipe the grease off to check the pipes are in order, so that'll be a waste of time doing if you happen to get one of those garages. Also, I recently replaced ALL of the brake lines on an Escort, and they were that bad that when I was manouvering them round the back of the suspension, they literally just came apart with very little force.
Imagine them bursting when driving.
Doing them is easy enough, just can be a bit time consuming getting them into place and then bleeding the whole system afterwards is a ballache. Cost about £8 for a roll of copper brake pipe which you just cut to size and bend into shape, then put the new connectors on and use an appropriate flaring tool to get the right ends needed.
While you're doing one, do them all. The pipes underneath the car are usually protected and made from stronger material, so they'll be alright more than likely. The fronts go from the servo to the caliper flexi pipe, and the rears go from the back end of the car where they connect to the run of pipes to the drums. On the Escort I had to drop the petrol tank to get one of the pipes out though. Otherwise simply enough.
As for the rest of your problems, easy enough, and agree with what Onslack has said!

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