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  #16 (permalink)  
Old 01-17-2012, 09:25 PM
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You would have to build bracketry (sp), but go to a pick and pull and find a vacuum pump off of a 7.3 Ford diesel. Belt driven (uses a press on pulley like a p/s pump, IIRC the shaft is the same diameter, so a pulley shouldn't be too hard to come up with)), and pulls a ton of vacuum. Couple that with a vacuum resevoir, and then you would have no vacuum issues at all. If the issue still persists, it is likely mechanical or hydraulic.



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  #17 (permalink)  
Old 01-18-2012, 12:19 AM
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Something is amiss here. There's enough vacuum, so I'd be looking at the pedal ratio, the MC bore to the caliper bore as well as the combination valve if used.

Another possibility is if the MC is bottoming out, it may be internally bypassing fluid around the seal(s). Can you see what the line pressure to the front brakes is?

The MC was bench bled, right?
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Old 01-18-2012, 10:36 AM
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Quote:
Originally Posted by sbchevfreak
You would have to build bracketry (sp), but go to a pick and pull and find a vacuum pump off of a 7.3 Ford diesel. Belt driven (uses a press on pulley like a p/s pump, IIRC the shaft is the same diameter, so a pulley shouldn't be too hard to come up with)), and pulls a ton of vacuum. Couple that with a vacuum resevoir, and then you would have no vacuum issues at all. If the issue still persists, it is likely mechanical or hydraulic.



Anyone ever try this ?


454 RATTLER
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Old 01-18-2012, 11:36 AM
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Originally Posted by 454 Rattler
Anyone ever try this ?


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I think if I needed to mount that and install a belt, I would go hydraboost first.
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Old 01-18-2012, 11:53 AM
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have you looked to make sure there are 2 different size chambers on the master cylinder ? i think you are bottomed out .
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