Re: Not enough vacuum for power breaks?
[Re: markshemiworld]
#1416264
04/07/13 09:04 PM
04/07/13 09:04 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Air! Bleed the MC then the corners. I'm assuming the rear drums are spooned up. EDIT forgot about the pushrod round nub clearance- check that also, want .060" or a bit less
Last edited by RapidRobert; 04/07/13 09:08 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Not enough vacuum for power breaks?
[Re: loaderpro]
#1416271
04/07/13 10:07 PM
04/07/13 10:07 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
Put a vacuum gauge on the engine and check it, You need an absolute minimum of 13 1/2 to 14 inches at idle. I have installed a few of these resevoirs and they usually work good, but if the cam is a quite a bit more than a stocker you may need to put a vacuum pump on it.
THIS is one opinion.... I have a 440 based 493 in my Charger. My idle vacuum is under 10 at 800 rpms and drops to 9 in gear at idle. The brakes feel fine, but will get depleted in short order. I added a vacuum can from Comp Cams. Problem solved. The low idle vacuum in my case allowed one or two good stops before the pedal firmed up and was non-responsive. The vacuum can allows so much more reserve, I have yet to find its limits.
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Re: Not enough vacuum for power breaks?
[Re: markshemiworld]
#1416275
04/07/13 10:29 PM
04/07/13 10:29 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
Could you please elaborate on what you mean by "non-responsive"?
Yes. Before installing the vacuum can, I'd get a good stop, maybe two, then the pedal got firm but didn't help the car stop. The pedal travel was never to the floor. I'd say excessive pedal travel is likely from air in the system. Other causes for excessive pedal travel if the system is absolutely free of any air are: Loose front wheel bearings, loose bolts retaining the calipers and in the case of rear drums, brake shoes not adjusted properly.
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