The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: Trackerjack brakes....
PostPosted: Fri May 04, 2018 1:45 pm 
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Can anyone confirm my thoughts on Jon's brake upgrade please?

I think they are VW Golf vented disks that are 239mm dia, with the 4 mounting holes redrilled to suit our pcd. That much I think is correct....but is there any additional machining or is it just the holes?

I have attempted to ask Jon but I've so far had no reply.

Hello, hello, are you there Jon? 😉

Thank you one and all!

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Still searching for Sprint UUW 410M....If you know it or see it, I want it back! Now known to be in the Llandudno area....
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Last edited by shaunroche on Sat May 05, 2018 8:39 am, edited 1 time in total.

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PostPosted: Fri May 04, 2018 4:09 pm 
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Quote:
Can anyone confirm my thoughts on Jon's brake upgrade please?

I think they are VW Golf vented disks that are 239mm dia, with the 4 mounting holes redrilled to suit our pcd. That much I think is correct....but is there any additional machining or is it just the holes?

I have attempted to ask Jon but I've so far had no reply.

Hello, hello, are you there Jon? 😉

Thank you me and all!
Shaun

Yes golf disc refilled to match Dolomite,you also need the centre hole machine a little,just so it fit on the hub,I used a file on mine,it's only a small amount

Dave


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PostPosted: Fri May 04, 2018 4:32 pm 
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I think he skims the face of the disc where it bolts to the hub to ensure it is parallel to the disc.

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PostPosted: Fri May 04, 2018 6:52 pm 
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Bear in mind the re-drilling is not to our wheel pcd its the hub pcd so the hub can be bolted to the disc. A clamping ring needs to be made for the back of the disc so out 3/8 bolts screw into it. Clamp rings can be made from fresh steel or an old disc can be parted off to use the threaded portion.

Tony

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PostPosted: Fri May 04, 2018 11:49 pm 
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Cheers for the replies chaps, thought as much!

Yeah I meant hub pcd not wheel pcd 👍

In fairness, I already have a pair of Jon's disks fitted and working but I've scored the back of them as one of the carrier bolts (on both sides!) Is too long and has picked up on the disk, hence my need for a new pair.

I was planning on getting a new set from Jon but he's gone all radio silence!

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Still searching for Sprint UUW 410M....If you know it or see it, I want it back! Now known to be in the Llandudno area....
Please get in touch!


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PostPosted: Fri May 11, 2018 10:25 am 
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We have now made contact again because I was having a week in Majorca dodging the thousands of cyclist's there! I missed this thread.
I only use Mintex discs now because with lesser makes they are not always parallel because my conversion mounts on the opposite side to standard VW GTI Mk 2 239mm discs.
Brakes can stand non concentricity but not side play run out. Though single pot calipers are very tolerant of some side play unlike the standard Triumph setup. I have just done a set up for a rally Sprint as he broke a standard caliper's lugs off possibly due to stub axle flex!
I will be here for anyone who needs any info as no more holidays are planned yet.
To answer the original question the bore needs boring out to 66.7mm and the holes drilled to match the Triumph hub, these will then bolt straight onto a standard unmodified hub and the clamp ring that either can be a cut up standard disc or an alloy ring which I make and standard 3/8 UNC bolts are then used. I hope this helps. :bluewave:

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The lunatic is out................heres Jonny!


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