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MGF rear brake upgrade


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Jimbob
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Joined: Jul 29 2016

Happy Sunday all,

Back again and onto the next job. Shes currently fitted with tiny Rover 200 rear calipers using a Talon adapter plate on the Metro uprights/hub with 240mm discs. Therefore, it's suffering badly from very front bias braking as I've got 4-pots upfront on 305mm disc.

So, plan is to upgrade to MGF calipers, which I've heard is a popular upgrade but struggling to formulate a plan on how to fit as seems to be little written on it (Maybe wrong!)... Once I can mount the caliper I'll plan to use an adapter plate to move it out and use a 280mm disc.

IHere is the current set up (sorry to leave the caliper hanging (terrible workmanship!) and then a picture with an MGF carrier attached (it's a carrier for the wrong side but I grabbed it from the scrap yard to test it)). As you can the carrier doesn't fit... And the Rover 200 one is too small for the MGF caliper piston.

Hope someone can help! 

Thanks again, Jim.

 

 

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Jimbob
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Joined: Jul 29 2016

And with the MGF carrier...

Jimbob
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Joined: Jul 29 2016

 

 

Roger Hammond
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Joined: Jan 21 2006

Hi

Why not just standard MGF caliper and rear disc? I had the 304mm disc with 4 pots on my Libra with MGF rears and never had a problem. If anything it was difficult to get the fronts up to temp on the road.

I did try larger rears and found it locked the rears on track before the fronts.

I found the best balance was with the 304mm 4 pots and MGF rears with standard pads all round.for the road and mintex on track

Jimbob
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Joined: Jul 29 2016

Roger,

Thanks for the reply- really good to hear your experience!

The only thing that I like about the adapter plate idea is that it would save me drilling the hub itself and I could just drill the plate to match the holes that are already there, but if you think bigger discs will put too much to the rear I'll have a rethink! Did you consider using a bias adjuster valve or dual master cylinder with bias bar at all?

After a bit of digging I came across a brilliant build site which I'm sure many have seen, which demonstrates the technique I'm after to match the Metro hub to the MGF calipers:

http://www.peteronline.co.uk/pages/build_5.htm

It shows how a 17mm hole is drilled and an insert/spacer (apparently a GTM issued one) is added. I'll assume these inserts are non existent now, but hoping they wouldn't be too hard to replicate?

Will keep you all upto date!

Cheers,

Jim.

Roger Hammond
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Joined: Jan 21 2006

If I remember correctly people have fitted the MGF caliper without the adapter, just carefully enlarged the hole. I don't remember mine having adapters.

I did consider a bias but thought there was no point when the standard set up was good and the larger setup just over braked the rear.

Craig Lawton
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DonatorOld School
Joined: Oct 6 2004

Hi Jim,

I have MGF caliper and discs on the rear.

They aren't fitted like Peter's with a spacer, but with an adapter bracket which I believe Talon provided.

Craig

Jimbob
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Joined: Jul 29 2016

Oh brilliant- if you have any photos that would be marvellous! I've found some people who are happy to develop them as I think Talon have moved on from their GTM days Sad

Cheers,

Jim.

Roger Hammond
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Have you called Dudley at Talon? Duds still has a Libra and I would have thought he could help out.

Craig Lawton
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Joined: Oct 6 2004

Hi Jim
I'll have a look through my photos and see what I can find.
As Roger suggests give Talon a call. They don't do as much GTM work as they used to but I'm sure this is due to a lack of it rather than reluctance.
Also I don't expect they would scrap the templates.

Craig

Jimbob
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Joined: Jul 29 2016

Roger and Craig- spot on. I got through to Dudley at Talon and he's stated that it is just a matter of filing out each hole a couple of mill to accommodate the MGF carriers. Good news!

Many thanks for your help.

Jimbob
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Joined: Jul 29 2016

It's a bit of boring update, but as a little add on to this (plus my other challenge with the hub nut which is yet to be resolved), I thought I'd buy and prep a new hub assembly, sort the brakes out for it as discussed here, ready for when I got that bolt is off! (needed new upper ball, looked a mess etc anyway).

After a bit of googling noticed that the front MGF hub assembly is identical to what I've got on my Libra (which I assume are Metro or Rover 100).

So, ordered a lovely refurbished one only to see that despite being the same dimensions, orientation etc as the Metro ones, they don't have room to add a driveshaft flange!

Anyway, any suggestions on sourcing a replacement assembly or anywhere where I can get my existing ones refurbished would be great- I'm simply haven't the time for these small bits! Sad

cubera
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Joined: Jul 28 2015

I expect you've solved this by now, but if not, then the answer is simple (though not necessarily easy), in that you knock through the hub stub which is fitted, and then you will be able to insert the wheel end of the drive shaft. It is quite possible that the stub will be "reluctant", and a hefty hammer is in order. This is the voice of experience!

Plan? What Plan? There ain't no plan!