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Old 04-30-2015, 02:53 PM   #1
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Default vacume diagram

my 94 skylark has a vacume line going down to the vacume modulator and i checked the line out but at the end of the vacume line by the modulator there was a check valve that reduced the vacume,is that suppose to be there or is it suppose to be full vacume. the haynes manual i have just shows a line going down there kind of vauge the vacume diagram on the car doesn't show much either.
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Old 04-30-2015, 06:12 PM   #2
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Last I knew it was a check valve. Should something happen to the modulator, you won't have a constant vacuum leak. Plus I think it also prevents trans fluid from coming up the line should it leak.
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