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Old 02-13-2012, 11:06 PM   #1
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Brakes Vacuum Question

Probably completely unrelated to the video you linked to here but you seem to know a bit about fox's. So here is my question for you every time i turn off my 1990 mustang the vacuum that is supposed to be stored in the brake system for temporary braking completely disappears making the pedal rock hard to push as soon as the car turns off. Any idea what could be causing this?
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Old 02-13-2012, 11:12 PM   #2
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Re: FREE Operation Mustang Web Show JUST posted!

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Probably completely unrelated to the video you linked to here but you seem to know a bit about fox's. So here is my question for you every time i turn off my 1990 mustang the vacuum that is supposed to be stored in the brake system for temporary braking completely disappears making the pedal rock hard to push as soon as the car turns off. Any idea what could be causing this?
Sounds like you might have a small hole in the brake booster diaphragm or a vacuum check valve that isn't holding, but let's see what Doc thinks.
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Old 02-13-2012, 11:20 PM   #3
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Quote:
Originally Posted by Trojan Horse

Sounds like you might have a small hole in the brake booster diaphragm or a vacuum check valve that isn't holding, but let's see what Doc thinks.
The vacuum check valve is that something I cous see with just my eyes if it's working or not?
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Old 02-13-2012, 11:34 PM   #4
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Re: FREE Operation Mustang Web Show JUST posted!

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The vacuum check valve is that something I cous see with just my eyes if it's working or not?
No, you could not tell by just looking. You would have to remove and test it.
Air should only pass through it in one direction. You can use a vacuum tester or your mouth to check it.
Try to find a vacuum diagram for your car in your Chilton's or Haynes manual or in a Google search and see if the system has any check valves in it that are related to the brake system.
You could also use a vacuum tester to check the brake booster diaphragm for leaks.
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Old 02-14-2012, 12:54 PM   #5
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Damn really dont feel like taking things apart... Oh well I'll go pick me up a Haynes or chilton manual later and get to it
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Old 02-14-2012, 04:04 PM   #6
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Re: FREE Operation Mustang Web Show JUST posted!

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Damn really dont feel like taking things apart... Oh well I'll go pick me up a Haynes or chilton manual later and get to it
Be sure to check before you buy to ensure it has all of the diagrams you need.
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Old 02-14-2012, 10:12 PM   #7
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Quote:
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Be sure to check before you buy to ensure it has all of the diagrams you need.
Will do thanks
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Old 02-14-2012, 10:28 PM   #8
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Re: Brakes Vacuum Question

Matt,

I moved these posts to the 79-95 forums, to clean up Doc's thread.
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Old 02-15-2012, 12:11 PM   #9
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Ok thanks man
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