New brakes on an old frame

stabilised
stabilised Posts: 70
edited May 2009 in Workshop
Mrs stabilised has been moaning about her old and ineffectual single pivot brakes for ages.

I've found some long-drop dual pivot ones for her, but they use the (now seemingly standard) nuts that recess into the brake bridge and the fork, rather than her old ones where the brake calipers have really long bolts that stick all the way through. Unfortunately Mrs stabilised rides an old Dawes 531c frame that doesn't have recesses in the brake bridge or the top of the fork so the nuts won't fit. The only solution I can think of is to drill out the holes in the brake bridge and the fork. That means widening them by a couple of mm. I don't think this is a problem in terms of significantly weakening them, but anyone know otherwise before I get the drill out, wreck the frame and have to buy her a new one?

Thanks.

Comments

  • John C.
    John C. Posts: 2,113
    Before you start drilling, have you tried some new pads. Try some of these http://www.wiggle.co.uk/m/cycle/7/Kool_Stop/ I found they made a huge difference. You will need some old cartridges, maybe use the ones from your new brakes
    http://www.ripon-loiterers.org.uk/

    Fail to prepare, prepare to fail
    Hills are just a matter of pace
  • volvicspar
    volvicspar Posts: 208
    Whatever you do don't come back from the pub and drill it out with a bit 3 sizes too big so the bolt just goes straight through the hole, as I did :x
  • stabilised
    stabilised Posts: 70
    [/Before you start drilling, have you tried some new pads. Try some of these http://www.wiggle.co.uk/m/cycle/7/Kool_Stop/ I found they made a huge difference. You will need some old cartridges, maybe use the ones from your new brakes]


    Yes, tried new pads - but they are still pretty useless (we are talking Weinmann 605 calipers (circa 1985)).


    [/Whatever you do don't come back from the pub and drill it out with a bit 3 sizes too big so the bolt just goes straight through the hole, as I did ]

    I'll keep that in mind :)
  • redvee
    redvee Posts: 11,922
    The rear can be overcome by using a front calliper and a nyloc nut, the front is a different matter.
    I've added a signature to prove it is still possible.
  • stabilised
    stabilised Posts: 70
    Well, the deed is done and looks fine so far. Taking the holes out to 8mm to fit the nuts in still leaves plenty of metal and everything tightens up fine.

    I'll let you know if it all falls apart at the first time of asking and Mrs stabilised ends up in a hedge :cry: :oops: