The Triumph Dolomite Club - Discussion Forum

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PostPosted: Mon Aug 08, 2022 11:19 am 
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Joined: Thu Sep 28, 2006 10:06 pm
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Location: Bristol
I have been looking through the various Triumph dolomite documents that I have in an attempt to find out what the minimum thickness is but I could not find this detail. In the end I did find a disc which had the information embossed on it and the figure is 0.23 inches. i have since found another set which is marked 0.32inch)

The Haynes manual does state that the run out must not exceed 0.006 inch and that if necessary , remove the disc and check for dirt on the mating faces. Should these be clean reposition the disc on the hub.

The problem I had in the past, when I purchased a set of discs was the fact that the thickness of the disc varied and this caused the brake pedal to pulse. I took them off and found a old set that were not down to the limit. I still need to get the new set skimmed.


Last edited by Richard the old one on Mon Aug 08, 2022 5:00 pm, edited 1 time in total.

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PostPosted: Mon Aug 08, 2022 2:45 pm 
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TDC Shropshire Area Organiser

Joined: Sun Aug 21, 2011 5:12 pm
Posts: 7013
Location: Highley, Shropshire
Quote:
I have been looking through the various Triumph dolomite documents that I have in an attempt to find out what the minimum thickness is but I could not find this detail. In the end I did find a disc which had the information embossed on it and the figure is 0.23 inches.

The Haynes manual does state that the run out must not exceed 0.006 inch and that if necessary , remove the disc and check for dirt on the mating faces. Should these be clean reposition the disc on the hub.

The problem I had in the past, when I purchased a set of discs was the fact that the thickness of the disc varied and this caused the brake pedal to pulse. I took them off and found a old set that were not down to the limit. I still need to get the new set skimmed.
0.23, just under 1/4", or around 6mm, sounds ridiculously thin to me! Running 140+ bhp cars as I do, i'm intensely aware of the Dolomite brakes fade problem, which can only be exacerbated by reducing the disc thickness to the bare minimum.

However, i'm aware that you are only running 1500s which don't put such high demands on the brakes, so, from that point of view, you're probably safe enough.

With that in mind, I have a few pairs of standard discs dotted around here which I have removed from cars to fit Trackerjack conversions to. Some of these, though having a degree of surface rust from my less than careful storage, (they've been indoors, but not greased or wrapped) appear to be nearly new in terms of thickness and finish. I'll probably only bin then eventually, since I definitely WON'T be using them, but they might do you a turn........

Steve

_________________
'73 2 door Toledo with Vauxhall Carlton 2.0 8v engine (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine (The Dolomega)
'72 Triumph 1500FWD in Slate Grey, Now with RWD and Carledo powertrain!

Maverick Triumph, Servicing, Repairs, Electrical, Recomissioning, MOT prep, Trackerjack brake fitting service.
Apprentice served Triumph Specialist for 50 years. PM for more info or quotes.


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PostPosted: Mon Aug 08, 2022 5:14 pm 
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Joined: Thu Sep 28, 2006 10:06 pm
Posts: 1164
Location: Bristol
Hi Steve.
Having read your comments I went and looked as the rest of the brake discs that I have kept and one set does state minimum thickness is 8.3mm which is about 3.2inches. That does sound a bit better. I was just surprised that it was not given in any of the documentation and only a few of the disc that I have seen have got a figure marked on them.

If you are going to the TDC rally on the 4th September I would assume a number of members would be happy to purchase some of your partially used discs as the new disc are over £60 each and the quality is poor.


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