leaky brand new tire - Mercedes-Benz Forum
 
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post #1 of 10 (permalink) Old 01-30-2015, 06:04 PM Thread Starter
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leaky brand new tire

so my practically new bfgoodrich for my pentas has a slow leak, barely even noticed it but it was around12 psi...tire shows no nails? wheel is straight, valve stem looks good....what could it be

tires are 6 weeks old, 500 miles
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post #2 of 10 (permalink) Old 01-30-2015, 06:16 PM
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Valve core loose in the Valve stem. Happened to me yesterday, after fighting a slow leak in the 2 rear tires on the BBS-RT's on Rose, the other tire that leaked bad had a screw in it. Fixed both for free at Discount Tires where I bought the tires.
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post #3 of 10 (permalink) Old 01-30-2015, 06:25 PM
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Mix up some dishwashing liquid in a spray bottle. Spray the valve stem, cap off, does it bubble up? Dare it is!! then spray around the rim where it joins the tire bead, does it bubble up?
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post #4 of 10 (permalink) Old 01-30-2015, 06:32 PM
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Did you buy/install the tires from a tire store? If so, just go back and have them check it out. They should have a container to dunk the wheel in to see if/where there are bubbles.

If not at a store, just get cracking with the soapy water, I guess.
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post #5 of 10 (permalink) Old 01-30-2015, 06:39 PM Thread Starter
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yeah i got them from americas tires, they are usually pretty good with me..ill head over tomorrow...thanks..hopefully nothing more than a valve stem
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post #6 of 10 (permalink) Old 01-30-2015, 07:36 PM
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America's Tires are Discount Tire in AZ. Same Company. Go back and tell them the problem and let them fix it. They Broke down both of my tires to find the cause, patched the one with the new plug n patch remounted and balanced both for free. Because they really want to sell me more tires and they will.
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post #7 of 10 (permalink) Old 01-30-2015, 07:44 PM
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Aaaaaand vdubp,

You could find a leak with the illustrated three piece rim sealing too….

As above, dishwashing liquid n water spray will pinpoint super fast!

Might even be as simple as a not tightened valve stem?

Good Luck man!

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post #8 of 10 (permalink) Old 01-30-2015, 07:45 PM
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That said, I finally ended up scrapping a set of tires with 3/4 tread left because they all had slow leaks. I would have to inflate one of them every week or so. PITA!!! Soapy water showed nothing. The shop that installed them didn't have a dunk tank. They broke a couple of them down and put sealer around the beads. Nothing helped. My wife ran over a big chunk of steel and tore one of them up so we replaced all 4. All was well after that.
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post #9 of 10 (permalink) Old 01-30-2015, 08:40 PM
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CHROMED ALUMINUM/MAGNESIUM RIMS. CHROME PEELS (sorry) anywhere on rim and air leaks out, .... slowly. Happened to two sets of my W-126 tires.
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post #10 of 10 (permalink) Old 01-30-2015, 10:06 PM
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I had a car for a long time and ended up putting four set of tires on it. On ONE set of Yokohama's, one wheel would constantly lose air at a crazy pace with no evidence of a leak. On the other three sets (two michelins and one BF Goodrich) there was no issue with that rim. Weird.

Homie the clown got sick of that crap and stuck a tube in it.
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