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Re: Questions about AIR BRAKES ???
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Posted by Bob on January 12, 2006 at 07:11:40 from (64.21.249.40):
In Reply to: Re: Questions about AIR BRAKES ??? posted by IaGary on January 12, 2006 at 05:30:26:
With NO AIR in your service brake system, you will have no service brakes. The spring-operated parking brakes will not come on until you apply the parking brake, which "dumps" the air from the parking brake system. At that point, the spring brakes will remain on until the system pressure comes up, and the parking brakes can release. Typically, there are no "spring brakes" on the front axle, and on only one of the rear axles (we're keeping it simple, and talking "straight truck" here), so, when you have no service brake pressure, and apply the parking brakes, yes, you will have brakes, but not on all the axles, and the spring does not apply as much pressure as the air does, when the system is working, so you will have less brakeing effect even on the axles WITH the spring brakes. But it's better than NOTHING!
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