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Brake booster check valve really a valve? V70-XC70 2007

If you can blow through in both directions, it isn't a check valve. Is this what you have? https://www.fcpeuro.com/products/volvo-brake-booster-vacuum-connector-s60-v70-xc70-xc90-9473812

Even a dealer shouldn't charge more than $10 for it.

I thought your car also has a pump which can become defective and lead to erratic pedal pressure.
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Keeping it running is better than buying new






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