Quote:
Originally Posted by Wain
The chap was saying that when accelerating- the manifold pushes air into the brake servo, increasing pressure in the servo ready for braking. Then when you brake, the air pressure is blown back into the manifold, thus reducing the air flow and help drop the revs.
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The manifold never pushes air it always sucks. When the servo is primed/under vacuum the manifold cant suck on it any more so it acts like a bung really as if the pipe were blocked. When you brake the servo uses the stored vacuum to aid in braking. When you lift off the brake the vacuum needs creating again meaning the manifold can suck air from the servo again, causing a very slightly leaner mixture for a short time. More of a by-product of the system than a deliberate engine slowing thing.
Block em off everybody happy.
Cheers
Stot