Thanks. My installer did and SMI said we were fine and told him how to change one part. I spoke with them as well.

I ran several tests out on local hills with the engine shut off and it took tremendous force (and I am a big guy) to slow the vehicle. It is a VERY dead pedal so zero advantage over a portable unit.

The Bosch booster (they invented hydro boost) has a small electric motor as a backup but apparently Chevy doesn't use one.

M&G said their design will solve this. Just love to hear from someone who has played with this.