RPM drop when brake is applied?

MDpsd06

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So in Idle when I apply the brake the RPM's drop a bit. Im thinking this could mean a vacuum leak in the steering box? Do not know if I am way off or not. My understanding the steering runs with the brakes, could be way off again. I have a good amount of play in my wheel also so did not know if the two are linked.
 

79jasper

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Way off. Brakes are hydroboost, ran off the power steering.
Diesels don't make intake vacuum like a gasser.

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78f100

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It's normal to hear feel a slight rpm change, as already said it's putting a load on the ps pump when brakes are applied, so you get a slight rpm dip.
 

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