Generally air in the system will present in a low brake pedal that gets higher if the brakes are pumped.
A vacuum or booster problem will present in a hard to press pedal.
With the engine off, pumping the brake pedal will empty the brake booster of any stored vacuum. then hold the brake pedal and starting the engine should cause the pedal the drop slightly.
The must be full engine vacuum to the brake booster (15+ inches, check it with a vacuum/pressure gauge, they're not expensive)
If there is enough vacuum, and the pedal does not drop as described, , suspect a booster problem .
Frank
Scandura III President
Frank’s European Service, Las Vegas NV
Manager, Las Vegas Hybrids
Editorial Advisory Board, ImportCar Magazine
Author: How to Take Care Of Your Vehicle so it Will Take Care of You
Host, Frank’s Car Care Tips Radio Show
Independent Business Coach, Elite http://www.eliteworldwidestore.com/
Senior digital Shop Advisor and trainer for AutoVitals www.autovitals.com
______________
Frank
Scandura III President
Frank’s European Service, Las Vegas NV
Manager, Las Vegas Hybrids
Editorial Advisory Board, ImportCar Magazine
Author: How to Take Care Of Your Vehicle so it Will Take Care of You
Host, Frank’s Car Care Tips Radio Show
Independent Business Coach, Elite http://www.eliteworldwidestore.com/
Senior digital Shop Advisor and trainer for AutoVitals www.autovitals.com