Our discussion of brake system nomenclature and the use of engine vacuum to boost the stopping power of the brake system, reminded me that the first thing I need to do this spring is to check for a vacuum leak. At speeds of 20 MPH or more, the brake system works well. However, when slowing down and coming to a stop, the brake pedal requires more and more foot pressure as RPMs decrease, to stop the vehicle.
I think I recall someone suggesting use of a volatile liquid like starter fluid, sprayed around each vacuum hose connection. The idea is that the liquid would be sucked into the intake system at a vacuum leak, increasing engine RPM’s, and identifying the location.
But, the idea of spraying a flammable liquid on a hot, running engine concerns me. I don’t want to make an ash of myself.
Is the above method a reasonably safe way to identify a leaking hose?