You could use a washer to space the calliper out by 1 mm, this would centre the disc in the caliper. (Outside is on the left, and inside is on the right) So in effect the perfect rotor for the E46 and F30 callipers would have a hat height of 48mm. These next pictures show that the M3 rotor sit a little too far inboard ie it's rotor hat height is 1mm to large. So i bought a E46 hub (£18) to experiment with as well as a set of used but good condition M3 discs (£70): In both cases the Centre bore and PCD could be amended by a brake shop. The VW T5 van would require an approx 7mm spacer behind the disc, so this would necessitate the need for Turners hub lip extenders. So i bought a Audi TTRS disc but the inner diameter of the disc was too small for the E46 hub, by a about 2mm. I'm gonna get the TTRS discs posted out to me, get my sis to fish out the F30 discs and pads out of the garden shed and see how things mate up! Will report back soon ie a couple of weeks as i get my collar bone plated tomorrow. Things are a little complicated by the fact that the brembo online catlogue, doesnt list the schematics for F30 340mm discs or pads, so I'm comparing my own measurements of worn items with the Brembo's, VW & Audi schematics. So overall the TT discs would be better, and a pair still work out cheaper than CSL or M3 discs here in th UK. Oh and the pads would need rubbed down 2mm to fit. The swept surface may be bang on, or a about 1-2mm to large, no big deal. Rotor hat height is also 3mm out, but it is unfavourable in terms of centring the disc in the caliper, meaning a spacer would need to be placed behind the rotor. These have the same PCD, but need the CB enlarged by 3mm. Then there is the VW transporter T5 van, yes van (340x32mm). ![]() However the actual swept surface may be a few mm less than required. There are some Audi TTRS/VW R32 discs (340x30mm) that would have required simply a PCD & centre bore alteration, rotar hat height was only 3mm out, but favourable in that it will actually help in centreing the disc within the caliper. Well i've had a busy summer, with little chance to work on this, apart from searching around for brake discs that may work better. The bend is actually very slight, but the angle of the picture makes it look like a lotīest news with using the F30 disc is that the pad from a front + back position is spot on:woot:: With 20mm of spacer it clears the dust shield, but then some folks may have wheel offset issues. This i easily bent forward without causing any other issues. ![]() With 18mm of spacer behind the rotor the back of the rotor just touches the front of the dust shield. Yes these aren't precise measurements, but the first pic shows the lip hub diameter (E46 bore), but the 2nd pic shows the approx diameter of the hub at its base (i had to move the micrometer away in order to take the pic) But this wouldn't be any off the shelf spacer, it would need a longer lip so that the wheel has something to rest on and also a screw thread cut into the surface of the spacer for the rotor retaining screw.Īny custom spacer would need a lip length of approx 20mmĪnd also the rear of the spacer would need to be machined, just like back of the rotor, to fit & mate with the hub properly. ![]() So lets start with F30 340x30mm rotors, which with a 73mm hat height wont fit the E46 hub, but i had a look around on other forums () and there is the possibility of putting a hub centric spacer behind the rotor instead of in front of it. I got round to trying various options, the F30 rotors again, E46 M3, and E46 M3 CSL.
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