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**1project2many** · 09-02-2015, 01:12 PM

Prop valve should bleed. If it's a GM style combination valve you may need to lock the pin in place.

09-02-2015, 01:12 PM	#48
1project2many Senior Member Join Date: Mar 2012 Location: Lakes Region NH Posts: 3,217	Re: 57 truck brake issue Prop valve should bleed. If it's a GM style combination valve you may need to lock the pin in place.