Join Date: Oct 2014
Location: Nashville, Tennessee
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Roque, not an expert on anything,..except chilling out!.... but the standard brake booster Vacumn test is to with car off pump the pedal 3 or 4 times to release any residual Vacumn, it usually will hold vac for 24 hrs or so.
Then put your foot on the brake pedal and start the car, you should feel the pedal drop as Vacumn enters the chamber. If it does not move, then you can walk it back....
What vac does engine pull at brake check valve? The one way check valve on the booster allows air to escape the chamber only when Vacumn is applied...when Vacumn is off that check valve should be closed...
If you think that is OK then check the hose engine vac etc.....
But you must have a good solid brake bleed with no air in the brake lines, yes you can do it by pumping the pedal, we all have but a good brake bleed machine can really make a difference.
So if it is drivable to a garage ask them to put it on their automatic brake blended. They can do it quick and that really gets the bleed right.