993 Brake Upgrade - Wheel Clearance Issues!

[AirCooledExcellence]

Hi All,

I've just finished bolting up a pair of 993 calipers to the front of my '84 Carrera.

Whilst test fitting the wheels (8 inch 951 Fuchs) I noticed the bleed nipple, outside top and bottom edge of the caliper were fouling them.

I got to work with the Dremel and cut a couple of mm off the bleed nipple, then ground down the offending areas of the calipers. The wheels now fit and turn fine with no obstruction, but I'm a little concerned that things are a little tight in there

Here's the mods to the top of the caliper:



Small amount removed from the bottom:



Still a very tight fit:





I know loads of others are running with this setup, has anyone had any trouble with stuff like thermal expansion of the caliper causing fouling, stones getting caught and causing damage etc...

Cheers,

Tim.

[911pcars]

A thin wheel spacer should help.

Sherwood

[AirCooledExcellence]

Yeah, that's what I was thinking, say 3mm or something. There still won't be much room in there though! Perhaps I'm worrying too much?

[KTL]

Agreed the thin spacer will solve the problem since the problem is the taper inside the wheel barrel is what causes clearance problems. But something is not right. I had 16x7 951 Fuchs on the front with my former 993 brake setup (993 calipers w/axial-radial adapter & hat from ProBraking Dave Walsh, Wilwood HD 309x32 rotors). It looks like you have the same brake kit as I did.

Jeremy D has this same setup on his car with no clearance issues on his 951 16x8 Fuchs. I had him test fit my 16x7 951 Fuchs before equipping my car with the 993 brakes. He took pics and the fit was tight but manageable. The only tight clearance I had was the bleed nipple CAP would rub the wheel. NOT the nipple itself. I've got some pictures somewhere........

[AirCooledExcellence]

The kit is from John Graber (North Coast Cab). The struts / hubs etc are all standard Carrera items with the other parts ordered from/specified by John. The calipers are centralised over the rotors, everything is running true...

So what could be wrong?

[911pcars]

Not sure what has worked in previous setups like this, but do you have any side-to-side leeway in the mounting location of the caliper relative to the rotor? If so, you could shim the rotor-to-front hub mounting surface to move the rotor and thus the caliper further inboard from the wheel.

Sherwood

[AirCooledExcellence]

One other thing I forgot to mention is that the pads are over hanging the disc by about 2mm. Seems like the caliper could do with being 2mm closer to the hub, could the caliper adapters be at fault here?

[johndglynn]

Originally Posted by AirCooledExcellence

One other thing I forgot to mention is that the pads are over hanging the disc by about 2mm. Seems like the caliper could do with being 2mm closer to the hub, could the caliper adapters be at fault here?

Duh, you think? LOL

If you have space to move the caliper, then inwards is the obvious way to go. I wouldn't be happy with that clearance but I don't base that view on anything other than opinion - I think you need a bit more space. I wouldn't want to run a spacer on 8s in front, they are already close enough to the arch.

[hmd]

You could grind off a couple of mm from the spacers to bring the caliper closer to the hub.
As long as the pad does not hit the center hat.

[AirCooledExcellence]

Originally Posted by hmd

You could grind off a couple of mm from the spacers to bring the caliper closer to the hub.
As long as the pad does not hit the center hat.

Yes, that's what I've decided to do, I just dropped them off at the machine shop who are going to mill them down 2mm.

Fingers crossed this will solve the problem but like John says above there still won't be much room in there. Do any of you guys running the same setup ever have trouble with crap getting caught between the wheel and caliper?

[KTL]

Never had a problem with junk getting between the wheel and caliper. But it likely can happen. Hot tires pick up all kinds of goodies and my wheels are always collecting rubber worms, pebbles, etc.

I had the same exact setup as you currently have. Same calipers, same rotor hats, same adapters (although I can't see them). My pads did not overhang. They were right at the OD of the rotor. But the problem I did have is that the pads sat too low at the bottom. They would rub on the relief between the hat mounting surface and the pad contact surface. Didn't do much harm other than the bottom of the pad getting a little bit chunked. But man o man did they squeal when cold!!!!! Sounded like a school bus.

[911st]

May I ask the cost of the adapters & rotors.

Are those used 993 Turbo calipers?

Thx.

[AirCooledExcellence]

Caliper adapters, rotor adapters + fitting kit was $275, rotors are Wilwood and are about $200 a set.

The calipers are stock 993 items, not "big reds".

[William Miller]

I think I have the same kit, but maybe an earlier version.
The front pads are very close to the edge of the rotor and maybe even rub the chamfered part of the edge. I had to do a lot of clearencing on the inside of the caliper to get them not to rub in there. So maybe mine sit a few mm closer to wheel center.

With the spacer, I had to add a thin washer between the spacer and the spindle ears to get the caliper centered over the rotor. Look at yours very closely and do some measurements. Maybe the washer will bring your calipers inboard enough to give you more clearance. I think if you take some metal off, it will push them out ?

No clearance issues at all with BBS RS wheels. I have 7's on the front now.

Hope this helps!


BTW, I bought the heavier Willwood Rotors at Summit Racing .com

[Kevin Stewart]

there are many cars with that type of clearance i wouldnt worry about it, we had to do it on one of my race cars never had a problem, Kevin

[911st]

Do you have to have the 944 Fuchs with the designed in brake clearance or will 911 Fuchs 7x16 work.

Also, can I get some contact info for the kit

Thx

[KTL]

Originally Posted by 911st

Do you have to have the 944 Fuchs with the designed in brake clearance or will 911 Fuchs 7x16 work.

Regular 16x7 fuchs will not work. Not even close.

Originally Posted by 911st

Also, can I get some contact info for the kit

Thx

Dave Walsh is the guy I got my kits from. His name is DinFtown here on Pelican and my contact email for him was: probraking "at" aol "dot" com which changed awhile ago to: service "at" probraking "dot" com

[JeremyD]

Sorry I didn't see this earlier - Dude - your caliper adapters are too tall - with the 993 calipers that have to be all the way seated - without any pad overhang.

[JeremyD]

See how much closer mine rest to the hub?

[AirCooledExcellence]

Thanks Jeremy, I've had 2mm removed from my adapters and that has cured the pad overhang. Should be OK now!