24 replies to this topic

[wobblybob]

rite im wanting to fit my weller that i have now got but m&ms told me that to convert my disks from 8.4 too smaller disks so i can run them i will have too get new hubs i thought i only had to get disk,calipers,flanges, and i also found this set up brake kit
which got my more confused becasue it doesent say u need hubs??
can some one tell me if i do or dont need hubs and if this kit will work meaning i wont need to buy anything else and it just bolts straight on??

[Purple Tom]

providing you have 8.4" discs now and not drum brakes, then that kit will bolt straight on using your existing hubs.

Its only if you are converting from drums to discs that you need new hubs.

[Jammy]

And if you get the billet aluminum calipers like these, then you only need the caliper.

[Guess-Works.com]

I think you need the ones designed for 7.9" disks, ie turned down 8.4's not dure if they are the same or not... I know minisport list theirs as different calipers, as the disk/drive flange offset is different. If you want to retain the current drive flanges.

Edited by GuessWorks, 30 September 2005 - 10:05 AM.

[clubman katie B.F]

did a bit of research on this the cheapest conversion kit was 290 quid from p&l it consisted of 2 cooper s calipers, 2 drive flanges two discs, a set of pads and the drive flange screws. the calipers for the 7.9 discs are sometimes milled down 8.4 calipers if that makes sense

[siggy]

Katie, its the discs that are machined down not the calipers.

Mini84, you may need new hubs as some 'S' discs will not fit over 8.4 hubs.

Siggy

[clubman katie B.F]

i did read in several places that if you machine down the discs, you can also machine a bit off the calipers so they fit 10 inch wheels, as i said i have done a little research on the subject

[Pie]

Kate is correct. You can grind down the callipers so it fits under the rim of them 10" wheels. Or if you want to cheat, and keep your original 8.4 discs, then space out your wheels" one problem with this is the only arches that will cover the wheels are Miglias, so if your going for miglia arches, this is the cheaper way.

[minimadjonesy]

alternatively, there was a fell at castlr coombe that has made 10" alloys that fit over standard brakes! look really cool and retro as they look like reverse rims!

[siggy]

I have heard of maching calipers. BUT unless they are pressure tested afterwards, it would be unadvised. If too much was taken of you could weaken the caliper and cause it to fail.

If you space the wheels out to clear the 8.4s, you create massive bump steer, I ried that many years ago and the car becomes almost unsafe to drive.

Siggy

[TJenkos]

These 10x6 Wellers youre on about? What spacers would i need for Miglias. I like the sound of them!

If i wanted Miglias with 10x6s, what work would be involved and what size spacers?

[siggy]

IIRC the spacer where about an inch (25mm).

But they caused massive bump steer and as you could actually see the discs and calipers from the front, you would have brake failure in wet weather.


Siggy

[Jake Blues]

If you are talking about 10 inch Wellers then it is possible to fit them to standard 8.4 inch disc set ups but......... you have to grind a bit of the edges of the calipers to make them fit. You do have to be careful where to grind and take it bit by bit testing the wheel frequentlyto see if it has stopped rubbing.
It doesn't make any difference to the functionality of them. Pressure test calipers? Never heard of it! (Doesn't mean you can't, it's just that I've never seen or heard it being done.
This mod doesn't work on 10inch alloys because there isn't the room on the inside of the wheel and you have to change the disc set up to the ridiculously overpriced Cooper S 7.5 system although there are other ideas which have been explored here on the forum.
You can use spacers instead of grinding but they are pretty much universally dismissed as a bad idea by anyone with a bit of knowledge of steering geometry and safety.

[siggy]

The problem with grinding metal off the calipers is you cannot tell how much is left between the outside and the fluid area. If ground too much off then it is feasable that when you braked hard, ie in an emergency stop then the caliper could burst!!!!!!

You can have any cylinder pressure tested.


'S' brakes are not overpriced, hoe much are they new £300 to convert 8.4s

I don't know abot you BUT My life is worth a lot more than that!


Siggy

[The Matt]

Siggy's right, if people were to randomly take a grinder to a brake caliper and not know what they were doing there could be no wall left in the cylinder (or very little). A pressure test would verify that the caliper would withstand the pressure that everyday driving causes (plus a safety factor I'd hope).

Or else, Jo Bloggs would be like:

'Oooh, the wheel fits now, nice.'

'Oooh, gotta brake hard'

'Ohhhh, why's me pedal gone down to the floor.............BANG'


:nugget: