Tire pressure drop, but no leak

2016 MERCEDES BENZ C200
10,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
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TIGERW
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One of my tires pressure keep dropping to 28-29 psi. The tire workshop cannot find any leaks. But the strange thing is it never dips below that 28-29 psi.
Jul 16, 2017 at 11:15 PM
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MHPAUTOS
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If you are loosing pressure there must be a leak. it could be a nail that has gone in and out, which is hard to find. a leak around the bead or the tire valve. these must be investigated. my money is on a tiny hole made by a small nail, this will be hard to find unfortunately.
Jul 17, 2017 at 4:46 AM