pedal to the floor due to SBC pump?

The way its built is that the system goes full mechanical (zero assist) when the SBC unit goes out.

btw - SBC had quite a long warranty if Im correct.

brake pedal pulsing hop or car behaving odd with brakes applied usually means one of the brake discs is bad, a good mechanic can isolate that with a dial indicator and sometimes correct it with shims too.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)