Very helpful info Dennis. Yes my thought was that IF I remove material at shoe metal, I'd do so at shoe bottom. Regardless, doing so would be a last resort. I'm loath to remove any material but want to achieve the 1.5 mm Bentley spec. I'll try to make a better tool for measuring mounted shoe diameter and drum ID but testing shows I'm getting constant drag. I'm not certain my infrared "gun" is getting accurate readings via the hole in wheel. Time taken to remove a wheel may not allow the drum to cool that much? A quick search on the 'net indicates that 100º F is not that hot for drums *after* use. Some see 300º F after hard test braking. But sustained temps above ambient, well...... After my first bought of testing, the drums did show what *might* be slight heat damage as did shoes. I cleaned up the drums and shoes. There is no brake pulsing as it was when parts were new. Image of possible heat damage to drum and shoes. Drum http://tinyurl.com/zevgfs9 shoes: http://tinyurl.com/gtc76n6 http://tinyurl.com/jvec8vg "cleaned up" shoe http://tinyurl.com/jbg34xe drum after light emery cloth: http://tinyurl.com/zbafhuu On 5/22/16, Dennis Haynes <d23haynes57@hotmail.com> wrote: > If you do insist on grinding take it off the bottom. Looking at the wear > pattern you showed you need to let the shoes seat and then you will have > room. Back in the days of manually adjusted shoes we set them for just a > touch of drag to get them seated. Disc brakes drag all the time. Keep in > mind that when you do use the brakes, it takes some time for the heat at the > drum-shoe interface to travel to the outside. > > If the wheels turn free after releasing the handbrake you are probably good > to go. > > As for the handbrake pushing the brakes out even with the pedal down, yes > that is normal especially on new shoes. Pressure to the rear brakes is > regulated. With the van raised in the rear the regulator kicks even even > further as it thinks the van is nose diving. It works both on inertia and > angle. Using the handbrake will push the shoes out and with them not seated > that will wedge,, distort the drum, etc and move out letting the brake pedal > sink a bit more. I just did a van with the GoWesty HD drums and it is > amazing how different the handbrake and service brakes work. Now installing > the front big brake kit on that van. > > Dennis >
-- Neil n Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca> 1988 Westy Images <https://picasaweb.google.com/musomuso/New1988Westy> 1981 Westfalia "Jaco" Images, technical <http://tubaneil.googlepages.com/> Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay> |
Please note - During the past 17 years of operation, several gigabytes of
Vanagon mail messages have been archived. Searching the entire collection
will take up to five minutes to complete. Please be patient!
Return to the archives @ gerry.vanagon.com
The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.
Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.