Brake pedal soft after SBC service

[Motor Head]

Good evening Star Tech contributors,

I have been skimming the threads looking for insight on the SBC braking system but could not find anything that addressed my problem so here goes.

Recently took the wife's 2011 SL 550 in for a B service. The car has 45K miles on it and the brakes have always been very good with a nice firm pedal. Although the pads were still serviceable, the fluid was due for a change and the dealer performed the service.

When we got the car back the brake pedal was "soft" if there is such a thing on an SBC car. To be more specific, the pedal travel has increased noticeably before braking action occurs. When I first got back in the car I accidentally overshot the front side of a crosswalk because I was expecting the car to react to the usual amount of brake pressure but nothing happened until I panic stopped.

We took the car back and the dealer was very cooperative and reran the car through all the brake system diagnostic checks which passed and performed multiple test drives. Their conclusion was that nothing is wrong but I am certain that we went from a very short-travel pedal to a very long-travel pedal for the same braking action after the service.

The only data the dealer doesn't have that we do is that they did not drive the car before the service so have no basis for a before/after comparison.

I understand that there is a mechanical fail-safe mode but I'm looking for advice about how to further investigate the issue since we are less confident with the braking system performance. I am hoping there is a way to restore brake pedal feel as part of the system adjustment. I'm not familiar enough with SBC to know what to ask the mechanic so I would greatly appreciate your input.

Thanks,
Motor Head