Oil the discs, haha!
Well I have 2 cans of brake cleaner and the plan is:
1. Clean pistons and pads with toothbrush and brake cleaner.
2. Brillopad / wirewool disc with brake cleaner
3. Toothbrush and brake cleaner on rivets.
I don't understand why the brake lines would create a pulse. Mine are all standard.
Everything actually runs freely and the pads do retract and don't drag. But a clean won't hurt. With a fixed caliper you have to have some movement somewhere to allow for the slight warp of a hot disc.
Anyway, it needs sorting because a couple of times I've locked the front wheel under heavy braking when it shouldn't have.
I'll let you know how I get on....
Brake lines can break down with age and get weak spots, so when you brake the pressure can cause a bulge in the line. It will then give a pulsing/throbbing feeling when braking, which can be mistaken for a warped disc.
You wanna buy yourself a small pot of Red Rubber Grease to put on the exposed parts of your cleaned pistons, it will help keep the crap and rust at bay.
And get the wire wool on the pad pins, and make sure there's no indents on them either, stopping the pads from moving freely sideways.
As for the "oil the discs" comment, yes i realise that's a (bad) joke, but you have to remember these posts stay on here for a long time, or get found in a search, and it only takes a complete newbie to only read that part and believe it then.....well, you can only imagine the rest.
Saw it on another forum years back and some youngster listened to some joker and cleaned all his brakes with WD40 on advice. That didn't end well.