Power Brake Booster

Which is why I asked what was his not doing. Perhaps we can lead him to a repair solution. Theres really only three things that can go wrong with a booster 1) the diaphragm developes a leak, or 2) the reaction valve quits,or 3) the valve breaks. The first two are often repairable. No3 not so much.
And all too often the booster gets blamed for stuff it is not involved in.
Jus sayin.....