Hello,
I plan to change the 'less than effective' shoes on a 1950 A7 with 'green' ones.
Anyone know where to go to get them?
Cheers Robin
Hi Robin,
I am pretty sure that the green linings are AM4 which is a racing lining so not working much until heated up as in the hard braking of racing.
If your current linings are old it may be a matter of replacing with modern ones. Any decent brake specialist should be able to supply and fit the appropriate linings and some will fit an over size lining and machine to fit. Also, they may be able to skim the drum to ensure perfect roundness.
Dave.
Skimming the brake drum requires a lathe big enough to take a wheel or you need to strip the drum to get the hub to fit the lathe. I had trouble getting a brake hub skimmed on a built wheel.
Hi,
Yes, skimming with the wheel built is usually not possible. Last time I had it done I managed to find an old agricultural machine shop and all I had to do was take the tyre off. They had some kind of vertical lathe so the wheel was centred on a flat bed and the necessary grinder brought down to skim the drum. A bit like huge hone I suppose.
The full width hubs and later 1/2 width hubs are less likely to go out of round as they are more rigid and unlikely to be affected by the tension in the spokes. I would think that any distortion from lacing on a rim would be more of an issue with the earlier drums.
Dave.
Just found this:- Stotfoldenengineers.co.uk
The Old Forge
Rose Lane
Biggleswade
SG18 0JT
If you are in the NorthWest, Lane Ends Engineering in Prescot, Liverpool have told me they have a machine that will take a fully rebuilt wheel (less tyre) for skimming. Maximum rim size however is 18". I've not used them for this work but have had them do numerous other engineering jobs on my classic bikes and they really do know what they are doing. Highly recommended. 0151 426 0230.
DJC
a work mate rallys a Vauxhall Nova, he fitted green pads... by the end of the day, he was running steel on steel. couldnt take the heavy use
Pretty pointless having a bare drum skimmed. Relacing can actually pull the drum out of round. It is possible to mout the wheel horizontally on a large milling machine. I have seen somewhere a near tool that you can attach to the spindle and spin the wheel and wind it gets down and take very small cuts.
A friend who has a large pillar drill skimmed my 19" bantam front wheel, with tyre fitted, using a milling bit in the drill, and the axle firmly clamped in a milling vice. We rotated the wheel by hand on its own axle, and adjusted the milling vice in small horizontal increments to bring the milling cutter on to the brake drum surface. Basic but effective.