E-Class (W211) 2003-2009

Are these valve stem caps safe?

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Old Nov 9, 2011 | 02:17 PM
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WEBSRFR's Avatar
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Tesla Model S P100D
Are these valve stem caps safe?

One of my valve stem caps is cracked so I wanted to buy a new set...

I remember reading to stay away from anything not ABS plastic because under hot/cold climate changes the metal caps can actually bond to the valve stem... These are the only ones I can find in the Parts.com catalog and they are apparently made out of solid brass. Are they good or should I try to buy an ABS plastic set?

http://www.parts.com/accessories/ind...catalogid=5525

I did find the following set on Amazon but I don;t like how they look. I like the clean look of the silver caps on parts.com and I don;t like the black background of the Amazon ones below though they are plastic...

http://www.amazon.com/Mercedes-Benz-...0865980&sr=1-1
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Old Nov 9, 2011 | 03:19 PM
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I had those on my w210. They are pretty nice, never had an issue of them getting stuck, but I think they did throw off my wheel balance. They are weighty, and I didnt put them on until after having wheels balanced
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Old Nov 9, 2011 | 03:26 PM
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I put some of those on my C32AMG when I had it. They were on the car for exactly one day before they were added to someone's collection.
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Old Nov 9, 2011 | 03:34 PM
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04 E320 4M Wagon
Originally Posted by 06e320cdi
I think they did throw off my wheel balance. They are weighty, and I didnt put them on until after having wheels balanced
That doesn't make any sense. You balance the tires without them and then attach them to the wheel to throw off the balance. Defeats the purpose of wheel balancing.
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Old Nov 10, 2011 | 08:50 AM
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03 Eclass, 03 BMW 06 Porsche Cayman S, 03 Harley Davidson "bored & stroked"
Originally Posted by WEBSRFR
One of my valve stem caps is cracked so I wanted to buy a new set...

I remember reading to stay away from anything not ABS plastic because under hot/cold climate changes the metal caps can actually bond to the valve stem...
http://www.amazon.com/Mercedes-Benz-...0865980&sr=1-1
been using the metal caps for over 20 years never a problem???
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Old Nov 10, 2011 | 09:19 AM
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Originally Posted by Davel
been using the metal caps for over 20 years never a problem???
You should not be using metal valve stem caps if the valve stems are made of metal also, such as TPMS stems. Those should have plastic caps.

Last edited by Barry45RPM; Nov 10, 2011 at 05:40 PM.
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Old Nov 10, 2011 | 11:26 AM
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Originally Posted by Barry45RPM
You should not be using metal valve stem caps if the valve stems are made of metal also, such as TPMS stems. Those should have p;astic caps.
i agree, dont have TPMS and stems are rubber...
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Old Nov 10, 2011 | 01:40 PM
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From: Cross Roads, PA
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Originally Posted by maxi13
That doesn't make any sense. You balance the tires without them and then attach them to the wheel to throw off the balance. Defeats the purpose of wheel balancing.

I got them as a gift after I had the tires mounted and balanced.
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