Tire pressure monitors? - Mercedes-Benz Forum

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post #1 of 7 (permalink) Old 09-16-2008, 06:31 AM Thread Starter
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Tire pressure monitors?

I have seen reference on these forums to M-B models that have been fitted with Tire Pressure monitors.

I do not have this feature. Does anyone know how they work?
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post #2 of 7 (permalink) Old 09-16-2008, 07:04 AM
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Cars like your CLK from 2004 would use the Beru tyre pressure monitor system. A lot of info available at the Beru web site.

Basically each tyre has a sensor inside the wheel, attached to the valve. The sensor transmits pressure and temperature info, received by antennas/receivers at the car side which pass the info to the tyre pressure monitor control unit and that again via the CAN bus to the cluster etc.

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post #3 of 7 (permalink) Old 09-16-2008, 07:25 AM Thread Starter
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Thanks for that.

What with wheel electronics, an ECU, two antennae and four LF satellite triggers, I think that I will carry on just kicking the tires now and again....
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post #4 of 7 (permalink) Old 09-16-2008, 08:40 AM
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Here's a cheap alternative - valve stem caps that change color when pressure drops. At $19.95 it will keep you from kicking your poor tires!

AutoSport Catalog - Tire Safety Monitors 800-953-0814
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post #5 of 7 (permalink) Old 09-16-2008, 08:58 AM
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Good information. Thanks.


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post #6 of 7 (permalink) Old 09-16-2008, 09:13 AM
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The plastic gizmo above is basically garbage.
If you want to add monitoring system Pressure Pro is the best on the market. I bought it for my RV and occasionally use it on cars. It is really nice to check the pressure at 75 mph and from reviews here I believe Pressure Pro is superior to the system MB uses.
PP sensors with about 1" diameter screw on the tire valves and activating and calibrating them-self at that moment. They send signal all the time every 5 minutes with battery life of about 5 years. In RV when the receiver is plug on all the time, you will know your pressure dropped while at sleep at 3 AM
The only problem on cars wheels I found was, that the rubber valve steam flex and the sensor rubs the rim. I solved it by adding rubber tape on the rim in this area. With 1 oz weight some recommend wheel rebalacing, but I drove 80-90 mph on regular basis and no vibrations.

Last edited by Kajtek1; 09-16-2008 at 09:15 AM.
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post #7 of 7 (permalink) Old 09-16-2008, 09:54 AM
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You can thank Ford Explorers and Firestone tires for the requirement these systems be fitted on all new cars.

Kent Christensen
'07 GL320CDI
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