Big Brake Modification

[wrinx]

Yes, but with this one, the brake pads are hanging over the discs a few millimeters, so I placed the caliper mount holes 2mm nearer to the other ones.

Yes, you're right they do...might change mine to this shape one day

wrinx

[Gery83]

Finished bracket, made with high pressure water cutter cnc.
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[jimnielsen]

Gery, have you made a bracket that has no overhang at the top of the disk? I used the 'original drawing' and then modified it so that there was no overhang, but I would like to get a definitive drawing with measurements for a 'no overhang' bracket..

jim.

[Gery83]

Gery, have you made a bracket that has no overhang at the top of the disk? I used the 'original drawing' and then modified it so that there was no overhang, but I would like to get a definitive drawing with measurements for a 'no overhang' bracket..

jim.

The truth is, that I didn't tried this one, only it's wood model.
The holes on this are 2mm nearer to each other, and there should be no overhang.
But tomorrow I'll try them, and post some photos.

[Gery83]

So here is the first try.
There is something I can't understand.
There should be no overhang, but there is 4mm.
But the reason I can't understand it why, is that the pad fits perfectly on the inner circle of the disc.
Is it possible that I have a bigger pad than usual?
It is bigger than the disc's surface with 4milimeters.

Why???

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[AlfaJack]

What size are 166 discs? They must be bigger than 304mm or they have a smaller "hub" area?

[AlfaJack]

I checked and 166 discs are 310mm x 28mm so the pads will accommodate this.

[jimnielsen]

Gery..you are using the fiat vt20 305mm rotors (disks) - not the 310mm 166 rotors?

When I made up my system for this same mod (using the 305mm disks), a LOT of fettling was required on the brackets to get to zero overhang. I am started with about 4mm overhang. You have to grind away some of the actual caliper rear face to get the caliper to move radially closer to the centre of the hub. So that you don't have to grind too much off the caliper, you also need to grind a little off the rear face of the attachment arms on the upright. See the pics of how I did this. It takes a lot of trial fitting to get it perfect.

jim.

[Gery83]

Ok, thanks!
So this way I have two choices.
- Use it with 304mm discs, and leave 4-5mm pad unused
- Get 166 310mm discs, and make new holes on it....

[Gery83]

The only problem is, that I only can get this type of 166 discs with 10 holes.
How are they mounted on the 166?

166 disk.JPG

[jimnielsen]

why can't you just modify your bracket to fit the 305mm rotor better?

[Gery83]

why can't you just modify your bracket to fit the 305mm rotor better?

Because now it fits perfectly on the inner side.

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- I don't want to grind off the caliper, to make it fit "more in"
- I don't want an overhang on the inner side, I think it's better to have it on the outside.
I will probably grind off the side of the brakepad this way:

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[jimnielsen]

with the pads that I am using (ferodo DS2500) you get approx 1.5mm overhang on the inner side that breaks away by its self - if you have the pads flush with the rotor top.

[Gery83]

with the pads that I am using (ferodo DS2500) you get approx 1.5mm overhang on the inner side that breaks away by its self - if you have the pads flush with the rotor top.

Hmm... That is strange.
Why are the Ferodo pads smaller then the other ones?
I Like it this way better, because few months ago, one of my colleges almost died, because something was wrong with his brakes (probably last time at the service, they assembled something wrong...).
What happened is, the brake pad hanged too much in and reached the inner side of the disc.
disc.jpg

He didn't noticed it, just used the car.
So one day as the pad grinded this part of the disc, as he braked one bigger on a speedway, the outer side of the disc broke off.
You can imagine what happened...
His only luck was that he was driving not so fast. So he only hit the barrier of the speedway. But it could have come worse...

[Gery83]

What is your opinion about this rim-caliper clearance?

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[WhizzMan]

It looks fine to me Usually when you have fitment problems, either the spokes hit the caliper, or the balancing weights are knocked off. I solve that by using double sided tape and roofing lead.

[jimnielsen]

Its tight, but it'd be ok for a race car! Most people dont use balance weights on race cars anyway..

[Gery83]

Its tight, but it'd be ok for a race car! Most people dont use balance weights on race cars anyway..

It's a road car.
But the weights are not in the way, so that's not a problem.

[AlfaJack]

It will be fine...you should see a standard Brera V6 setup - unbelievably close!

[Ade]

Is there no way to fit Brembos without brackets on the Q4?
Fiat Coupe 20v Turbo hubs not work like with the V6?

[mindus]

Is there no way to fit Brembos without brackets on the Q4?
Fiat Coupe 20v Turbo hubs not work like with the V6?

It will work. There is a thread somewhere on this forum.
However Fiat Coupe 4 pot brembo calipers a lot smaller as compared to AR 166 calipers. Smaller break pads, less braking area.

[colibry]

i have drawings for brackets that dont need any mod and they fit perfectly. ill post pics when i find them.

[colibry]

Ok. i found the pictures. here they are. This will fit perfectly on any 155/145 alfa with alfa 166 discs ( drilled 4x98 holes) and 4pot brembo calipers by brembo.

[jimnielsen]

Thanks, for the pictures! They will be very useful one day I am sure!

jim.

[wrinx]

Ok. i found the pictures. here they are. This will fit perfectly on any 155/145 alfa with alfa 166 discs ( drilled 4x98 holes) and 4pot brembo calipers by brembo.

Is this for use with the Coupe calipers?

wrinx