Brake discs

[TimClarke]

I had a similar issue on the bike I bought last year. There was a dark print of the brake pad on the inside face of the disc and a consequent pulsing of the brake at low speed. Particularly annoying when trying to come to a smooth halt.
Colour me nasty but I introduced the brake disc to my random orbital sander with some 60 grit. The chrome on the disc is incredibly hard so no concerns about taking too much material off, but with a bit of effort I managed to remove the imprint making sure to address the whole surface to keep it consistent.
That's fixed it. Initially, the braking power wasn't as good as previous but as the disc surface polished up again and bedded in over just a few miles it's back to the same power as before minus the judder.

That's really interesting - i'll have a good look

I wonder if I just stick a couple of hundred miles on the bike the braking process will take off the rust/patchiness?

[Galligaskins]

Ah. Have to say yours looks a lot worse than mine did I'm not sure that looks recoverable at home. I don't think normal brake usage will rectify that. I did a few hundred miles on mine with nothing like the level of rust/patchiness and it didn't improve, hence resorting to the orbital sander as I reasoned I had nothing to lose. I hope you can get your discs sorted somehow. Maybe The Disc Doctor as others have said. I've no experience with them.

[TimClarke]

Ive just been looking through the parts catalogue and it looks as though the hydraulic pipe and the bleed nippl

P4050044.JPG (98.34 KiB) Viewed 92 times

e are the wrong way round on my bike?

[Morini Jen]

Hi Tim.

As far as I'm aware, it doesn't matter too much as the brake pipe and bleed nipple are connected. The bleed nipple on my bike became rusty and I was worried about removing it so Alex at NLM (who really knew his stuff) fitted a banjo with an incorporated bleed nipple on the brake line side. It works fine.

If you need more confirmation, Steve Browns 3½ Sport (which may still be for sale) has the same arrangement as yours.

[MickeyMoto]

The calipers are reversible for left and right, if you look at them, as Jen says, it does not matter as either 'port' can be used for hydraulic pipe and bleed nipple.

[TimClarke]

Than k you!