Test brake booster check valve?

[Varmint1967]

2021 JTR...I have a hard brake pedal after a few days of sitting. Some other people on this forum have said that it might be a bad check valve on my booster. Does anyone know of a way to test this check valve without buying another one first?

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[Badunit]

Here is the test from the service manual:

POWER BOOSTER CHECK VALVE TEST
1. Remove the power booster check valve from the power booster.
2. Using a hand operated vacuum pump, apply 15-20 inches HG (508-677 millibars) vacuum at the booster side of the check valve.
3. The vacuum should hold steady. If the gauge on the pump indicates vacuum loss, the check valve is faulty and should be replaced.

 

[Varmint1967]

Thank you very much. I will invest in a vacuum pump ASAP.

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