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Re: brake booster hard pedal
[Re: MILFORD MOPARS]
#3096494
11/23/22 10:24 AM
11/23/22 10:24 AM
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Joined: Jan 2003
Posts: 8,165 Plymouth, MI
Blusmbl
master
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master
Joined: Jan 2003
Posts: 8,165
Plymouth, MI
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I have this issue as well, except I have a vacuum canister and a vacuum pump. It is worse at colder ambient temperatures. At 70F it is ok. At 30F it doesn’t have power assist for a mile or two of driving. I’ve verified the pump is working as intended, my next step was to put a vacuum gauge at the line going to the booster.
I have a hunch it’s the booster not sealing.
'18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118
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Re: brake booster hard pedal
[Re: IMGTX]
#3096619
11/23/22 06:34 PM
11/23/22 06:34 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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i don't think they'll work at 10". i have a midland ross on one of my cars and it doesn't like much of anything below 16". you may need a vacuum pump if an extra reservoir doesn't help. you also may need to play with the distributor centrifugal curve (and vacuum advance if you're using one) to help the low rpm vacuum.
Last edited by lewtot184; 11/23/22 06:35 PM.
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