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Old 09-02-2013, 03:48 PM   #1
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Tire Losing pressure

We had our 31 ft. class C being worked on for 5 weeks. It was sitting in the guy's yard. Anyway we drove it home and I saw a tire was low. It measured at 10 pounds.
So I put 80 pounds in it three hours ago and now its down to 63 pounds. So it has a slow leak.
Two questions:
Can it having lost the cap make it lose that much pressure and that fast?
I assume not.
Also we bought it a little more than 3 months ago to replace a bad tire. It is a BF Goodrich. Those have a warranty. Can I take it to any place that sells BF Goodrich and get it replaced or repaired under the warranty?
Thanks
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Old 09-02-2013, 04:03 PM   #2
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Cap or not, should not lose air. Look for a nail (but don't pull it out if you find one). For a slow leak I usually swap the valve core and ensure the valve core is not screwed in too tight, before I get involved in having it pulled and repaired.

Depending on the size some GY dealers may not handle it methinks. Suggest to call around first.
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Old 09-02-2013, 04:12 PM   #3
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Quote:
Originally Posted by Richard2003 View Post
We had our 31 ft. class C being worked on for 5 weeks. It was sitting in the guy's yard. Anyway we drove it home and I saw a tire was low. It measured at 10 pounds.
So I put 80 pounds in it three hours ago and now its down to 63 pounds. So it has a slow leak.
Two questions:
Can it having lost the cap make it lose that much pressure and that fast?
I assume not.
Also we bought it a little more than 3 months ago to replace a bad tire. It is a BF Goodrich. Those have a warranty. Can I take it to any place that sells BF Goodrich and get it replaced or repaired under the warranty?
Thanks
Like vsheets said, cap or no cap the tire should not leak air. You have a leak somewhere. First stop, call the place you bought the tire and they should find the leak. Get it fix asap, life of the tire is shorten by low air pressure, driving or sitting.
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Old 09-02-2013, 04:46 PM   #4
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Could just be a bad valve or maybe a rim leak as well as a nail. Wouldn't cost much to replace the valve and nothing to check for a nail. Some soapy water is your friend here.
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Old 09-02-2013, 06:04 PM   #5
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If you can't find the leak, take the mounted tire to a local tire dealer. They can put it in a dunk tank and quickly isolate the leak. Alternately, if you have a kiddy pool...
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Old 09-05-2013, 04:39 PM   #6
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Update. Today I checked the pressure and it has not gone down from a few days ago since I put air in. All I did since then is put a new cap on it.
Maybe its not leaking because it is sitting in the driveway?
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Old 09-05-2013, 04:50 PM   #7
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Leave the cap off and see if it still leaks.


Your valve core can still be leaking, but the cap is containing it. Go to an auto parts store and pick up a valve core tool and tighten it up. I would buy another core and replace it.
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Old 09-05-2013, 04:57 PM   #8
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Could be a slow leak in the valve and the cap is taking care of it. Easy enough to check. Take cap off, put soapy water on valve and look for bubbles.
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Old 09-05-2013, 05:02 PM   #9
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I have the same problem, outside right rear was leaking down. Made arrangements to have it repaired and it had quit leaking. Took a 2600 mile trip no leak. Then it went completely flat, zero pressure setting for a week. Aired it up to 85 and has not lost any now in about 2 weeks. Gave the valve stem the spit test, no leak, GRRRRRRRRRRRRR.
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Old 09-05-2013, 05:21 PM   #10
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Sometimes the leak is where the valve stem goes into the wheel. That is what happened to me.
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Old 09-08-2013, 10:23 AM   #11
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Had the same problem with wife's Jeep. Grabbed my trusty spray bottle of 50/50 liquid soap and water and wet the entire tire, then waited. Shortly I spotted a small mound of bubbles forming. Drove to my local tire repair shop, where they de-mounted the tire to discover a small finishing nail.
Valve caps made of plastic are not true caps, they are merely dust covers. Only metal valve caps will prevent air loss from a leaking core.
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Old 09-08-2013, 11:03 AM   #12
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A few thoughts:

1) Valve stems can leak, and ambient temps and pressure can cause them to hold air for hours/days/weeks, then overnight leak down to zero.
2) A cracked or rusted through steel rim can exhibit the same symptoms as #1.
3) Some shops have no idea that the core needs to be a heavy duty (truck) type valve. Often they put in 35PSI valves for small tires. These have a lighter spring and can leak after you check air pressure as the higher pressure RV tires use causes them to seal poorly.
4) There are a lot of cheap Chinese cores out there. Avoid them. Or at least tell the shop you need a truck tire core.
5) Valve extensions, especially the braided type, age and can leak. Cheaper brands have poor seals. Check them.

And of course, have the tire shop check for nails or screws.

Yes, any shop that sells that brand should be able to handle your warranty. Call first as mentioned to be sure they can handle your size tire. I always look for 'Truck Tire' shops.
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Old 09-09-2013, 08:20 AM   #13
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Quote:
Originally Posted by Jim_HiTek View Post
A few thoughts:


3) Some shops have no idea that the core needs to be a heavy duty (truck) type valve. Often they put in 35PSI valves for small tires. These have a lighter spring and can leak after you check air pressure as the higher pressure RV tires use causes them to seal poorly.
4) There are a lot of cheap Chinese cores out there. Avoid them. Or at least tell the shop you need a truck tire core.

I had suspected a bad core (see earlier post) causing my problem and had changed it out, replacement was probably Chinese, isn't everything that's common hardware. Tire lost about 5 pounds last week in storage, I added air and checked the pressure and heard it leaking after checking. Changed out the core with another that I had on hand, one with the long spring on bottom.
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Old 09-09-2013, 08:25 AM   #14
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Something else to check is the bead. I had a tire with a slow, occasional leak on my Jeep Commander. Sometimes it would stay up for weeks, other times I'd find it 10 pounds or so low. I could find nothing in the tire. Took it to a tire shop with a dunk tank and they found it was leaking about the bead of the rim in about a 6 inch place. Dismounted the tire, cleaned the rim and remounted. No more trouble.
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