Hi guys,

Im measuring the gap from the brake booster pin to my beake master cylinder and the manual says to apply 500mmhg of vacuum pressure to the booster.

Is this something I can do with one of those handheld vacuum pumps?

I just got my brake booster serviced at Power Brake Booster so im assuming its in good shape. But it doesnt seem to hold a vacuum. Is there a process to this?

 

It's fine to use a handheld vac pump, but as long as the pedal isn't depressed the booster should be holding vacuum.

I've had RX-7s that would hold vacuum in the booster for weeks, if not months.

 

So my booster is OFF my car currently.

Would it be possible to apply vacuum off the car?