I been reading a lot of threads on the usage of M calipers on the rear for 5 lug conversion, found the mention of using 5mm washer / spacer between the caliper and mounting bosses to space for the early 911 vented ( 20 mm thick ) rotor, but no real mention of this being the total thickness needed or if it is 5mm PLUS the splash shield mounting bracket , which would add it's thickness to the overall dimension.
If someone with more knowledge of this setup would enlighten me , I would appreciate it.
Thanks...
Jaxdream
I don't know if I am more knowledgeable but I just installed M calipers on my 75 chassis. I used 1/2 SAE flat washers as spacers. I ended up using 2 per mount hole to get the caliper centered on the 20mm 911 rotor. Car not running yet so no real world feedback but visually it looks correct.
If I were doing that, I'd at least use FLAT washers with the hole the appropriate diameter for the bolt.
The Cap'n
I used the washers on mine, sized to the bolt. Two per bolt. I am using vented rotors. I also bought longer bolts as I felt I wanted it threaded all the way.
Van914
Thanks, this is helpful , but I was wondering about the most ideal dimension , as washers are sometimes inconsistant in uniform thickness , although SAE washers are more consistant. I suppose I'm looking for the magic number / dimention that would center the caliper over the rotor best. I read in some earlier threads that the dimension that others went with was 5mm , but no mention if this was achieved using the splash shield bracket in conjuction with another spacer or simply spacer (s ) to add up to 5mm , if that is the magic number .
Thanks I'll get some sae 1/2 in washers and measure them , I do want to use metric if at all possible .
Jaxdream
ah! no no I have 2 1/2" washers too and though it does not rub bad it is NOT centered....i wish I knew the exact dim's as it will make an aWfUl noise when warm and pulling into my garage.....
I used a piece of flat bar and drilled two holes 3 inches apart, instead of washers.
yes please....?
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