[TR] TR3A Rear Brake Drum

[Jim Bauder]

When I was doing brakes professionally for pay, most professional brake shops
and mobile services used to 're-arc' new shoes to better fit and to mate with
the drum that they will have to fit into. The machinist would also usually
chamfer the leading edge (I can't remember, it may be the trailing edge or
both?) to allow for a better/easier fit and less rear brake chatter/shudder.

Jim
Jim Bauder
480-309-9525
'68 TR250 CD47L
Scottsdale, AZ
http://www.triumphowners.com/647
-----Original Message-----
From: triumphs-bounces at autox.team.net [mailto:triumphs-bounces at autox.team.net]
On Behalf Of Scott Suhring
Sent: Tuesday, April 14, 2009 7:37 PM
To: 'Curt Curtiss'; 'dorpaul'
Cc: 'Triumph Mail List'
Subject: Re: [TR] TR3A Rear Brake Drum

They are relined original shoes, so they are at full thickness. This was also
suggested, especially on the leading edges, so I am going to give this a try
since it has the least potential damage and can be carefully ground down. I can
then test to be sure I am getting full contact and if not, may take it to a shop
to have it shaped to the drum.  Thanks for the support.

 

Scott Suhring

Mechanicsburg, PA

'70 TR6

'59 TR3

 

  _____  

From: curtcurtiss at gmail.com [mailto:curtcurtiss at gmail.com] On Behalf Of Curt
Curtiss
Sent: Tuesday, April 14, 2009 8:26 AM
To: dorpaul
Cc: Scott Suhring; Triumph Mail List
Subject: Re: [TR] TR3A Rear Brake Drum

 

I ran into this when I purchased and installed new shoes, I had to take a belt
sander and take some of the lining off to get my drum back on. How much lining
is on the shoes?

Curt

On Mon, Apr 13, 2009 at 9:41 PM, dorpaul <dorpaul at bellsouth.net> wrote:

Scott,
I've heard this tightness will settle in, maybe?
Paul

----- Original Message ----- From: "Scott Suhring" <suhringtr36 at comcast.net>
To: "Triumph Mail List" <triumphs at autox.team.net>
Sent: Sunday, April 12, 2009 10:34 PM
Subject: [TR] TR3A Rear Brake Drum



Well, I got the new rear cylinder installed in my '59 TR3, but have encountered
a problem that I am scratching my head over. Before I needed to replace the
right rear brake cylinder, my wheel/brake drum turned freely.
Now since I replaced the cylinder, I can barely get the drum on and once on, you
cannot spin the shaft due to the shoes being so tight on the drum. I have
changed nothing else, measured the piston against the old cylinder, and although
the pistons have a different shape, the measurements seem to be the same. The
adjuster wedges are also fully in. Any thoughts as to what could be causing this
problem? I can try installing the old cylinder after rebuilding it or I could
have the drum shaved down a bit.  TIA

Scott Suhring
Mechanicsburg, PA
'70 TR6
'59 TR3
Triumphs at autox.team.net
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