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4 pot cosworth calipers
mookaloid - 6/4/05 at 04:14 PM

Some questions for sierra cosworth experts out there. I want to upgrade my front brakes to 4 pot calipers and I am thinking of 2wd sierra cosworth calipers.

Are these a straight swap for standard XR4i front calipers?

Do I need cosworth discs too?

Are sierra cosworth 2wd uprights the same as regular sierra uprights?

Thanks in advance

Mark

quattromike - 6/4/05 at 04:21 PM

The 2wd cosworth uprights are very much different from standard sierra uprights, for a start the botom ball joint on the standard sierra is a tapered bolt and on the cosworth its a parrallel pin! well on mine they are. and also have a slightly diferent geometry as well for instance they are taller
Mike

RogerM - 6/4/05 at 05:05 PM

Short answer is they are not a straight swap and even changing the hubs, brake discs and just about everything else on the front of the car is the only way to make them fit!!

Do yourself a favour and forget them. If you want 4 pots then go for something aftermarket. At current Cossie prices they are probably similar money and they HAVE to be lighter!!!

mookaloid - 6/4/05 at 05:51 PM

Oh right then so not such a brilliant idea then

Cheers

Mark

grusks - 6/4/05 at 06:36 PM

Just been doing this myself. Had a set of cossie 4pots left from my mod prod racing days, so i thought see if they fit.

Im running standard sierra hubs.

Cossie discs ( fit straight onto the hub)

Heres the tricky bit.


You'll need to grind about 3mm off the mounting surface of the calliper, to enable the disc to sit in the centre of the calliper.

Also the mounting holes are different sizes (10mm hubs 11mm callipers)

One last thing on the standard sierra the calliper had the mounting tread, on a cossie the hub had the thread.

Which means that mounting the to together you've no threads, so its nut and bolt time.

All in all, it does go (just), but a set of lightweight aftermarket jobs (money permitting) might be better.

Ill take some pics after the football.

mookaloid - 6/4/05 at 09:04 PM

Ok grusks I'd like to see that

Cheers

Mark

Mr G - 6/4/05 at 09:35 PM

If you don't already have the cossie 2wd 4 pots I would'nt bother going that route.

For improved braking using cossie 283mm discs with 4i/rst2 re-spaced calipers look at my thread HERE


HTH


Cheers


G

NS Dev - 7/4/05 at 08:20 AM

quote:
Originally posted by quattromike
The 2wd cosworth uprights are very much different from standard sierra uprights, for a start the botom ball joint on the standard sierra is a tapered bolt and on the cosworth its a parrallel pin! well on mine they are. and also have a slightly diferent geometry as well for instance they are taller
Mike


Off topic, but I have done this before, as you say the uprights are very different, and much stronger and I wouldn't advocate putting cossie calipers on the std upright, but not all cossies had the parallel pin and pinchbolt! The 3 door's had the std sierra taper bottom mount. Took me ages to find a pair of those!!!!

The sapphires, both 2wd and 4wd, had the pinchbolt uprights

grusks - 7/4/05 at 08:00 PM










When grinding off the 2/3mm, rig up a master cylinder or airline to clamp the caliper to the disc to keep it sqaure.

James - 8/4/05 at 09:10 AM

quote:
Originally posted by grusks

You'll need to grind about 3mm off the mounting surface of the calliper, to enable the disc to sit in the centre of the calliper.


Is grinding 3mm off a mount that's only 8-10mm in the first place a great idea?

Cheers,
James

[Edited on 8/4/05 by James]

grusks - 8/4/05 at 06:13 PM

I ran like this on a race car for 4 seasons, didn't a have problem. The callipers are 16mm thick at the mounting lugs.

mookaloid - 9/4/05 at 10:38 AM

Looks ok to me... May be I'll have a go

Thanks for the pics Grusks

Cheers

Mark