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Old 06-26-2008, 11:50 AM   #1 (permalink)
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vacuum brakes

has anyone tried to add a vacuum tank for EOC with power brakes?

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Old 06-26-2008, 12:01 PM   #2 (permalink)
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I don't know about your cars, but I get a good three pumps on my brakes before I'm out of vacuum. This is enough vacuum 99% of the time. Plus, part of ecodriving is not using your brakes.
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Old 06-26-2008, 12:09 PM   #3 (permalink)
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i have one 5% grade for three miles speed limit 30mph and one 6+ % speed limit 55 hard with an auto
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Old 06-26-2008, 12:19 PM   #4 (permalink)
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Quote:
i have one 5% grade for three miles speed limit 30mph and one 6+ % speed limit 55 hard with an auto
Is it possible to (safely) shift the auto into a lower range and have it stay there while you go down the hills? Then you might not need brakes.
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Old 06-26-2008, 12:25 PM   #5 (permalink)
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no i have to neutral to turn off and stop the motor then urn back on for speed and odometer.
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Old 06-26-2008, 12:28 PM   #6 (permalink)
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i could idle in a lower gear but its a 3.8 liter engine lots of gas just to do that
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Old 06-26-2008, 12:34 PM   #7 (permalink)
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I take it your plan is add an additional volume to hold vacuum (sic) and plumb it in between the brake booster and the checkvalve in the brake booster line. For example if you had an big propane tank which you emptied, unscrewed the valve, cleaned out the oil that will be on the bottom, etc. you would use this as the tank. It sounds reasonable.

The down side of this is that it would take LONGER for the engine to establish a new vaccum if you used it all up while the engine was off. But if you plan ahead it could be OK. And it is better than no power brakes at all.
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Old 06-26-2008, 12:35 PM   #8 (permalink)
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just to add, I think the vacuum is only used while you are changing the position of the brake pedal. If you keep the brakes pressed the same amount and don't move the pedal I don't think you lose the vacuum.
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Old 06-26-2008, 12:47 PM   #9 (permalink)
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yeah i guess i'll see what i can find for a tank, go from there. thanks for you thoughts on this
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Old 06-26-2008, 01:04 PM   #10 (permalink)
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For long grades like that you can always use the e-brake for small amounts of braking so you don't use up your vacuum.

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