[Rollo`]

So why has BMW gone to sliders on the rear of all m performance cars now? I find that somewhat disappointing.

I was hopeful it would not be the case on the m240.

[BigRon033]

They've done that on every BMW with the integrated EMF parking brake starting with the F10. I'd imagine this saves weight and complexity compared to the E70/F15 electric parking brake system (central motor, cables, and drum in hat parking brake shoes). I don't see them going away from that, even with the M3/M5/M8. The F87 M2 is probably going to be the last BMW with a fixed rear caliper.

I don't see it affecting braking performance by having a floating rear caliper. Just look at the F90 or F10 M5. Those brakes are MASSIVE and those things stop on a dime, even with a relatively small rear EMF caliper. As long as the single piston size and rotor diameter is appropriate, they should be able to retain some really good braking performance.

[Rollo`]

It's more of the looks that bother me. Thanks for explaining why they made the change.

[solstice]

I’m ok with the rear sliding caliper, even the beastly M5 CS have them and they look ok to me at the rear where big braking power isn’t needed.

I’m more disappointed that we don’t get drilled rotors in any of the options or trims. That is an eye sore on a performance car IMO.

[Dinosoar]

Originally Posted by BigRon033

They've done that on every BMW with the integrated EMF parking brake starting with the F10. I'd imagine this saves weight and complexity compared to the E70/F15 electric parking brake system (central motor, cables, and drum in hat parking brake shoes). I don't see them going away from that, even with the M3/M5/M8. The F87 M2 is probably going to be the last BMW with a fixed rear caliper.

I don't see it affecting braking performance by having a floating rear caliper. Just look at the F90 or F10 M5. Those brakes are MASSIVE and those things stop on a dime, even with a relatively small rear EMF caliper. As long as the single piston size and rotor diameter is appropriate, they should be able to retain some really good braking performance.

The only issue I have with sliding calipers is more of a reaction issue. Monoblocs clamp down very quickly and are less prone to piston knock-back...which is also related to the hub design...sliding calipers react slower to clamping down. For the street, probably less of an issue. On the track, I take issue with that.

As far as looks, yeah, M cars should have two or four piston monoblocs in the rear...just sayin.