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How are you turning the rear wheels? Please describe your actions to do this.
Front wheels, in a RWD vehicle, have no relevance or connection to the driveline, and can turn freely at all times if hydraulic brake pressure is not applied.
Same comment for front wheels in an AWD vehicle, provided it has an open (non-limited slip) front differential. Many examples of Mercedes 4MATIC have open front differentials. Please post your VIN to find out more about your particular 4MATIC version, if you have 4MATIC.
It is recommended to not have the parking brake on when storing a car, therefore I found in this forum that if I hold the brake lever while engaging park the parking brake would not engage. My friend was over and we were talking about the car and I mentioned I thought I had taken the parking brake off but there was no way to know as the car was in park. I grabbed the rotor on the back wheel and to my surprise, it turned. So I can turn the front wheels and back wheels.
If my wheels were on I would put the car in park without the parking brake on and try to push the car, see if it moves.
Park locks the transmission, not the wheels. With the parking brake off, the rear wheel should turn, while the opposite site rear wheel turns in the opposite direction, due to the differential gearing.
Why did you remove the wheels? Why not just elevate the car enough to take the weight off the bottom of the tires and leave the wheels on?
The reason I removed the wheels: - I don't drive this car in the winter calcium filled roads but the previous owner did and the clearcoat is damage. I will get the wheels refinished. Also, the runflats are coming off, although they are relatively new I will put them back on for the next owner in four years or so.
And the reason it will be up on blocks all winter is for less stress on the air suspension. From what I have seen they can be problematic.
Park locks the transmission, not the wheels. With the parking brake off, the rear wheel should turn, while the opposite site rear wheel turns in the opposite direction, due to the differential gearing.
Yes rraisley is right. I can guarantee there is a pin in the trans that locks it up when in park. My garage has a slight slope in it and after I wash the car when I pull the car into the garage I release the parking brake and then turn the car off, I can feel the car slightly roll until the the locked up trans stops the car from moving any further. I don't like to leave the parking brake on after washing the car as the next day it will stick to the rotor and have a hard time letting go of it when released, not a good thing for the rotor or pads and that matter the rear Calipers. There are electronic parking brakes on both left and right rear wheels.
From your description, you are holding one rear wheel, or one front wheel, and turning it, did I get this right?
By turning one wheel, and in the presence of an open differential, there is no resistance to turning the wheel. Your vehicle is behaving normally and as designed, provided you do not have limited slip differentials. You have not provided information about your 4MATIC system or your. VIN, so the assumption at present is that you have open differentials, a common Mercedes installation.
as rraisley mentioned, the transmission is locked, which prevents two wheels on the same axle from turning.
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