[68c10airstream]

I was a dealer mechanic for a long time and i will throw this out, think of the times your vehicle died on the road and after you pushed the pedal a few times and exhausted the booster, the pedal got rock hard and didn't stop well. Yes it was designed there but still a huge boost non the less. Also think of the surface area that the booster has multiplied by the vacuum forces and it adds up. As another idea to clean up the firewall, some truck if remembering correctly ran a 90 degree pedal assembly maybe under the dash, or a hydroboost under the dash. Fun stuff on a blank sheet. Good luck, Brian F.