Lost Stopping Power

[JayG]

If the booster is out, the pedal will be REALLY HARD to press to get any stopping power
You can pull that hose and see what I mean

[blue62]

Originally Posted by JayG

If the booster is out, the pedal will be REALLY HARD to press to get any stopping power
You can pull that hose and see what I mean

yes if it is a total failure that is true.
If the diaphragm has a pin hole leak it will still have some pressure differential from the vacuum side to the atmospheric side of the diaphragm.
It will just be less pressure differential then spec. So it could take more pressure (maybe a little more maybe a lot more) on the brake pedal to apply the brakes.
If you remove the hose there will be no pressure differential from one side of the diaphragm to the other. So it will take maximum (REALLY HARD) pressure on the brake pedal to apply the brakes.