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My Spitfire Restoration Print
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molten
January 8, 2011, 5:45pm Report to Moderator


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Hello
Not much progress recently. Funds running low so turned my attention to rear brake hubs. These had plenty rust on them so were de-rusted and inspected. One of the drums have some pitting on the brake surface and some wear near the edge of the hub - couple of pics, one is close-up.

When are the hubs 'past it'? When they are like this or would you say these are servicable?
Cheers fella's.



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willcolumbine
January 8, 2011, 7:15pm Report to Moderator

Will Columbine
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How is the thickness of the drum? The pitting doesn't seem to be too bad - looks like it'd scrub out after a bit of mileage or, if it bothers you, you could run some sandpaper around them to get rid of it. If the drums are below minimum thickness then that's it and you need new ones!


William 'Wilbo' Columbine
1976 Triumph Spitfire 1500 (HCR '09, RBRR '10)
Walsall, W. Mids.
http://williamcolumbine.blogspot.com/
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molten
January 8, 2011, 8:08pm Report to Moderator


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Thanks
Whats the minimum thickness spec on the drum?

Scott


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willcolumbine
January 8, 2011, 10:02pm Report to Moderator

Will Columbine
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I don't know off the top of my head but there's usually writing cast or stamped into the drum that tells you!


William 'Wilbo' Columbine
1976 Triumph Spitfire 1500 (HCR '09, RBRR '10)
Walsall, W. Mids.
http://williamcolumbine.blogspot.com/
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molten
January 9, 2011, 1:34pm Report to Moderator


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Hello Wilbo.
Cant find anything on hubs themselves (qualcast) nor even searching tinterweb so if anyone knows the wear limit on brake hubs, i'd be greatfull

Many Thanks
Scott


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willcolumbine
January 9, 2011, 3:23pm Report to Moderator

Will Columbine
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I can't find a minimum drum thickness in my books or on the internet either and my car isn't at home at the moment for me to look at!

If I were you I'd just get new ones. They're not that expensive and it'll save you a good deal of hassle both now and in the future. All things considered, I think it's the only sensible thing to do, especially if you've fitted new shoes.


William 'Wilbo' Columbine
1976 Triumph Spitfire 1500 (HCR '09, RBRR '10)
Walsall, W. Mids.
http://williamcolumbine.blogspot.com/
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lancepar
January 10, 2011, 12:03pm Report to Moderator


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In the Haynes manual on page 197 there is a picture of a brake drum with what looks like information regarding the min’ lining thickness and max’ drum dia’.
Which would be great but I can’t read what the dimensions say. Have a look yourself and see if you can work it out.



Quarry Bank, West Midlands.
'72 MkIV Spitfire as nature intended.
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drofgum
January 10, 2011, 11:29pm Report to Moderator

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Scott,
I have managed to read the brake drum in the Haynes manual: maximum diameter is 7.005". I looked through all of my manuals yesterday evening for a wear limit, but I never thought to try to read the drum in any of the pictures. Thanks to Lancepar for that!
                                                                    Cheers,
                                                                    Paul
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rotoflex
January 11, 2011, 1:58am Report to Moderator

Bill Hooper
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did the owner's manual have a spec for it?


1972 GT6 Mk3 - KF11404UMobile, Alabama USA
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molten
January 11, 2011, 12:37pm Report to Moderator


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Many Thanks gents

This info should give me something to go off. My Haynes (must be different revision?)manual on p197 doesn't show a hub and the surface of the hub was quite rusted and I can only just make out the 'qualcast' impresion in the casting.
So the maximum internal diameter should at least allow me to see if my hubs, are 'past it', though paonted up they look pretty good  

Thanks again
Watch this space...


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molten
January 12, 2011, 10:22am Report to Moderator


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Hi Fella's
Looks like I may have spoken to soon.
I did find the picture of the hub mentioned above in the haynes manual, but i cannot read it clearly. I did however come across an inner hub diameter which should be 7" (178mm). Great I thought... until i measured the inner diameter which measured 203mm???
Likely these could be original 76' drums and may have worn to some degree but surely not to this extent as the shoes still have 5mm on them.
So could I ask a favour form anyone with a 1500 spit?
If anyone is currently putting drums back on their spit could you possibly measure the inner diameter of your brake drum and get back to me?

Thanks as ever


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drofgum
January 12, 2011, 11:24am Report to Moderator

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Scott,
203mm is very close to 8". Is there a chance your car has GT6 rear brakes?
                                                                           Good luck,
                                                                           Paul
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molten
January 12, 2011, 5:55pm Report to Moderator


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Quoted from drofgum
Scott,
203mm is very close to 8". Is there a chance your car has GT6 rear brakes?
                                                                           Good luck,
                                                                           Paul


Hi Paul
That is a very good question. I didn't know they were different size .
The PO said that the car had a GT6 chassis (difference?) So perhaps it may have GT6 rear brakes?? I am not sure. What is the difference (other than hub size that is) between GT6 brakes and 1500 spit. Logical difference would be increased surface area if hubs are 8".
If they are GT6 brakes then at least braking should be a little improved
Cheers



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drofgum
January 13, 2011, 1:59am Report to Moderator

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Scott,
Yes, GT6 rear brakes are 8" drum instead of the 7" of the Spitfire. the important thing about that is that it gives more area to dissipate the heat. You should check the front brakes also as the Gt6 front brakes are also bigger and the front brakes are far more important.
                                                                                         Cheers,
                                                                                         Paul
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molten
January 13, 2011, 5:54pm Report to Moderator


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Hi Paul
I haver not double checked yet but think the fronts are standard 1500 as I purchased new discs which seem a little smaller than the dust sheilds so look correct. Unless I am overlooking some obvious detail, I presume this set-up (GT6 rear brakes & standard 1500 fronts) should be fine on normal road going car - perhaps rears might be a bit more effective- maybe?.
I am also presuming (hoping) that i do not have to match up the fronts. If I am wrong, someone please tell me & why.
If all is cleared up with brakes, I will finally be able to move on and get chassis rolling again over the next week.
Thanks to all for your comments.
Cheers


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