[TR] TR6 Brakes Update

[Dave]

I remember working on a Japanese car of some ilk (Honda?) that not only had these screws but also had tapped holes in the drum.  If you remove these screws and thread them into the tapped holes they would bottom out on the hub.  If you continued to turn them it would push the drum away from the hub making breaking stuck drums very easy indeed.  Pretty clever.

On the other hand, considering the use of grade 2 hardware and and the rust-prone environment, I wonder how many of those screws were drilled out at the first or second brake shoe change-out because the slots were stripped out.  If you are replacing these I would suggest some better screws such as: 

https://www.mcmaster.com/#standard-flat-head-screws/=19w71q5

 

 

Dave Massey


 

 

-----Original Message-----
From: Reihing, Randall S. <Randall.Reihing at utoledo.edu>
To: John Macartney <john.macartney at ukpips.org.uk>; 'Randall' <TR3driver at ca.rr.com>; rolds <rolds at plausa.com>; triumphs <triumphs at autox.team.net>
Sent: Fri, Oct 20, 2017 6:59 am
Subject: Re: [TR] TR6 Brakes Update

Those two small, flathead drum screws represent a lot of additional machining: Drilling and countersinking the drums then drilling and tapping the threads for the screws that were manufactured on a screw machine to produce those little flat head screws, and then assembling the drums to the backing plate, or hub. For transport, would not a simple metal band and tensioner, like shipping departments have used for decades, be equally effective and work much faster, with far fewer steps, involving no machinery and machining, at a fraction of the cost of those screws? I recently rebuilt the rear brake assemblies on my 1959 TR3A and found those little screws useful to hold the drum in place while the wheel was mounted. Without them the drum kept tilting at an angle that made it more difficult to mount the wheels. Would the lack of those screws make changing a tire/wheel out on the highway somewhere more difficult? Probably. From a mass manufacturing point of view, It does seem like 
 expensiv
 e overkill but it does make mounting the wheels a little easier.  

Randall Reihing




_______________________________________
From: Triumphs [triumphs-bounces at autox.team.net] on behalf of John Macartney [john.macartney at ukpips.org.uk]
Sent: Friday, October 20, 2017 5:28 AM
To: 'Randall'; rolds at plausa.com; triumphs at autox.team.net
Subject: Re: [TR] TR6 Brakes Update

Randall wrote: While I agree with Dave that they appear to serve no real
purpose; my feeling is that there had to be some reason for them to be
there.

Many UK motor manufacturers bought in fully assembled front and rear
suspension assemblies from outside suppliers. These were usually shipped in
open stillages/racks on the beds of open-sided trucks and often uncovered by
a tarp or similar. Well, they were painted anyway - so why cover them?
Given the state of British roads in those days (and today as well) an
unsecured brake drum falling off an assembly and heading for wherever it
wanted to go was a real possibility. Therefore the drum was secured by two
or more screws. Next imponderable?

Jonmac



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