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Date:         Sun, 22 May 2016 11:55:57 -0700
Reply-To:     Neil N <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Neil N <musomuso@GMAIL.COM>
Subject:      Re: Setting E-brake causes adjuster to adjust? Hot Drums.
Comments: To: Dennis Haynes <d23haynes57@hotmail.com>
In-Reply-To:  <BAY180-DS12D03014A62A1BD14232AA04D0@phx.gbl>
Content-Type: text/plain; charset=UTF-8

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>

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