I have finally found, fitted and can report on the 280mm Front Disc conversion.
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Comparing the image of the 280mm discs with the 240mm std set-up below illustrates the difference in appearance, at least:
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The supplier I found (neither Mike Satur NOR MGFMania do the FRONT kit any more) was:
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I am pleased with the fit & function of the kit. The brakes seem to give much more deceleration for a given pedal force, though as the weather has been so awful lately, I have driven the TF very little since fitting the kit.
Others considering this mod. need to know the following:
1. The standard 14" steel spare wheel DOES NOT FIT OVER THIS LARGER DISC & RE-POSITIONED CALLIPER! I ma in the process of finding & buying a good 15" square spoke wheel as a spare.
2. Despite what I said on earlier posts, I have not manufactured locating rings. When i measured the ID of the original 240mm discs, which I am (almost) certain were the O.E. Rover discs (only 22,00 miles when I removed them, and they were well-worn) I found that the disc ID was about 2mm larger than the diameter of the spigot on the hub, so the O.E. disc are NOT located by the spigot.
3. A few extra M12 steel washers are useful, probably essential to make the calliper carrier align perfectly (seem my comments to the supplier below).
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4 off M12 x 1.5 nuts are useful to hold the disc tightly against the hub face to check calliper carrier alignment and, if you want to check it, for disc run-out.
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For those still interested, I made the following comments to the supplier "Kezzermuldooney":
- I had to use TWO washers between the Al Alloy adaptor and the hub, to get the calliper carrier to align correctly with the disc. This was true O/S and nearside. Total 3 thin washers, 3 of your thick washers +2 intermediate size, from my own stock.
- Different thicknesses of washers were needed (top versus bottom bolts) to align the carrier with even spacing either side of the disc.
- I had anticipated the need to hold the disc tightly against the hub, so I had purchased 4 off M12x1.5 nuts, and I already had plenty of M12 washers.
In the light of points 1 & 2 above, can I suggest that it would be helpful to provide 8 off (or at least 6 off) of each thickness of washer in the kit. I was fortunate in having plenty of left-over 12mm washers from a previous job, but many (most??) purchasers of the kit would not be so lucky.
I used threadlock when finally fixing the brackets to the hubs. As this adaptor should never need to be removed, this seemed a wise precaution, would you agree?
I used the same Torque (85Nm) as specified in the manual, to tighten the adaptor to hub, and the calliper-to-adaptor bolts.
The need to use different thicknesses of washers to make the calliper align correctly with the disc (point 2 above) indicates that the hub surfaces the Al. Alloy adaptor is attached to are not machined “accurately”. To be fair to MG-Rover, the Al Alloy adaptor is attached to (and effectively positioned by) the two surfaces MG spot-faced to accept the heads of the M12 bolts, NOT the normal reference face used by the callipers. I suspect the machining tolerance for the face the calliper is normally attached to is much tighter. Inaccuracy/inconsistency of the spot-facing only effects the depth of penetration of the attachment bolts, which would only become a problem if it was wrong by a couple of mm.
Hopefully this information will be helpful for anyone else contemplating the 280mm front brake conversion.