Normally I don't come straight out and say BS!, but it's time to bring this to an end. This stuff about out-gassing creating brake squeal holds as much water as a gnat's butt. Think for just a moment.... if the friction material produced enough gas to create a squeal every single time you stepped on your brake how long would the freakin' pads last?? Think about how fast a teapot of water dissipates when the water boils hard enough to create a whistle.
The only thing those holes create is sales for the manufacturer and a reduced swept area for the pads to work against.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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