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Perry S

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  1. I drive a 2006 Mack Granite cement mixer. Sometimes if I'm holding down the brake pedal too hard ( I live in the Ozark mts, everything is steep) and I go to set my parking brake, the brakes won't set. I don't hear the air release you get when you set the brakes. If I let up a bit on my foot brakes the parking brakes will then set. But if I'm on the steep hill that's hard to do, usually just hold it using low gear then set the brakes. I've replaced R14 valve relay, there is another type valve inline after but before the smaller individual replays. any ideas?
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