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On 5 Dec 2005 at 0:57, Dave Hall wrote: > Actually, the Type 3 calipers were only ever Type 3 calipers. While > the early Type 4 are the same dimensions, they are not actually the > same part number - maybe the difference is simply in the compensating > pin. I had a feeling it was mentioned in connection with disc runout > in the factory manual, but can't check at the moment. I've probably never worked on early type 4 calipers, I just knew that they used the same rebuild kit and pads as the late type 3 calipers. I guess I may have assumed too much. > Looking at the drawings, the Type 4 parts book shows a caliper with > centre pin, while the Type 3 book doesn't. Err! Well, THAT's not much help. ;-) > I guess the thinner discs of the earlier ones were more susceptible to > the problem - the later ones are thicker (same as early Type 4 discs), > and I don't think Type 4 ones have the centre pin (maybe I'm wrong - > Jens?). I always felt that the place where flex might occur and be important would be on the axle, where the weight of the car in a corner might deflect it enough to push the disk over a bit. I'm guessing that this is why VW made the axle 2mm larger starting in mid-68. I don't think disk flexing would be enough to be important here, since the load on it would always be in the plane of the rotor, but I could be wrong about that, too. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~