[PLF69]

Originally Posted by pruettfan

All of the blue calipers are the same (Brembo) they are used in the M2,M3, M4 and as an option on most other BMW models. The squeaking discussed above is because of the pads not the calipers, basically the moisture creates a rust layer and you have to generate heat to work that layer off. Not a big issue. There are some very good aftermarket pad options that not only resolve this issue but also reduce brake dust.

That was true for F series but totally different for G series.

For G series
M3/4 Calipers are a totally different design than regular 3 series, I think they are based on Brembo GT calipers like the ones Porsche uses.

M340i Track Pack calipers are basically 5/7 series and also X3M calipers but using different sizes rotors depending on application.