Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › POWER STEERING LEAK CHECK › Reply To: POWER STEERING LEAK CHECK July 5, 2020 at 11:28 am #959410 Jeffrey VoightParticipant Air and fluids are too different to check this way. All your seals are designed to keep fluid from exiting outward. A vacuum test will not be accurate to test for leaks and could possibly damage sealing.