Hydrovac Brake System 

great vid daniel. it helps us dummies understand how these work so we can drive our old ass trucks. thank you kindly from kansas.

After a few hours of troubleshooting my GMC 6500 grain truck I stumbled upon this video. It made me think to check simple solutions which turned up a plugged air filter/breather that took about 5 minutes to clear.

Takesme back to better times

Interesting film. Now I know how my brake system funks. I must fix an broken vacum hose, then it works.

I love old military videos, unfortunately the quality 240 only. I understand in some parts but not the other (I have bad visual). "So, keep on road!" NO SIR!! I want to stay in front of my computer to study more xD...

I have a 1953 seagrave fire truck, can the booster suck the brake from the system, no wheel cyl. shows leak but i have to keep filling the master cylinder, can the booster be rebuilt are is it to old ?

my dad's isuzu truck with diesel engine has the vacuum pump coupled to the alternator...newer alternators without the vacuum pumps are cheaper...can we just drill a hole on the intake manifold ang tap the brakes vacuum line there...so we can use a cheaper alternator?

M35 GOV?

This just has to be Mike Wallace of "60 Minutes" fame narrating this. Any way to find out? Sure sounds like him!