Re MOT (Brake pipes)
Hi
Clean pipes with a soft wire brush or stiff tooth brush, it will be mostly dirt that will come off and will improve appearance. Then COVER THICKLY all the pipes that you can see with black 'Hammerite' underseal, use the spray, or paint it on if easier. It's best to carry this out several days before the test, but it's not essential. Then take it to an MOT test centre ONLY:.. NOT to a test centre with a garage/workshop/business attached to the MOT centre.
If the tester can't see any rust or corrosion on the pipes he cannot fail them and he cannot remove the underseal either.
Regards
Chris