| Re: [GMCnet] JC-4 Vacuum Pump?? [message #364211 is a reply to message #323893] |
Sun, 23 May 2021 12:18   |
GatsbysCruise
Messages: 261
Registered: January 2017
Location: Waukegan, Illinois
Karma:
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Senior Member |
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The question was "Just for comparison what is nominal engine vacuum in a braking situation?"
I am pretty sure unless you are very good at being a mechanic, that you may wonder the same thing.
I read a message a time back where someone was taking readings and said with the vacuum pump
running, the system would hold 20lbs vacuum.
But he also suggested that pressing the brake pedal, with the engine not running, and holding the
pedal down, does not hold the psi, but the vacuum leaks off, ever so slowly. You will eventually,
and it seems in a short time lose any vacuum you have stored if you have no vac pump operational when
the engine dies.
food for thought.
Just what I read.
GatsbysCruise. \
74GMC260 Former Glacier Model style. \
Waukegan, Illinois \ Keep those MiniDiscs Spinning \ MY GREYHOUND IS FASTER THAN YOUR HONOR ROLL STUDENT \ WindowsXP-Win7-Win8.1-UBUNTU STUDIO - UBUNTU VOYAGER - Berzin Auto Center
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