I have the same question and same experience as you. I have both solid and vented housings on the bench, and look identical down the markings on the housing. I think it's very possible the differences were slight and overlooked during past rebuilds or something like that. Since none of the other components (outside of the yoke) seem to change, I can't imagine it's truly consequential. Search "voodoo" on this board - there is a huge recent thread about all this.
Old style front brake calipers: vented vs solid piston housing differences?
I know the yoke has an extended slot, and I think the guide pins are longer, but supposedly the piston housing (6) is also different. It seems there are 4 different versions (2 for vented rotors and 2 for solid rotors).
However, comparing housings of a caliper from a 900 with solid rotors and one with vented rotors show no apparent differences. Perhaps the vented calipers I compared were previously rebuilt with the wrong housings, the differences between them are extremely small, there was something I missed in my measurements, or it's only different on paper.
Does anyone know what the differences between the differently numbered housings are?
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However, comparing housings of a caliper from a 900 with solid rotors and one with vented rotors show no apparent differences. Perhaps the vented calipers I compared were previously rebuilt with the wrong housings, the differences between them are extremely small, there was something I missed in my measurements, or it's only different on paper.
Does anyone know what the differences between the differently numbered housings are?
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