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CAUTION! must use the parking brake on incline

17475 Views 20 Replies 6 Participants Last post by  RSM
So it happened twice car was in Park ! (gear) selected after few minutes car rolls back on inclined road . luckily was in car . took it to dealer and was told it states it in the owners manual car can default back to neutral So on a hill must use parking brake. what engineering marvel was this :confused:
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I've never experienced this problem before. I usually always engage the parking brake anyway but there were a few times that I forgot the the car did roll a bit , like maybe an inch or two, and stopped.
On a slight incline you should not need to use the parking brake. plus the fact that it goes into neutral on its own :eek: apparently Mercedes knows this because they have a disclaimer in the manual.
Can you point out what page that's on in the manual?
Check out pages 154 and 155 of the owner's manual. Are you sure you put the car in P and not N before you shut the car off and remove the Smart Key?
According to the warning on that page it sounds like you put the car in Neutral (N) instead of Park (P ) when you shut off your car. Are you sure put push the button at the tip of the shift lever to put it in Park rather than moving the lever up or down to put it in Neutral? Because it says if you put it in park the brake is automatically engaged.
Idle neural is a bit more common nowadays with manufacturers trying to make fuel efficient cars. Either the CLA is equipped with this feature or the torque in the small engine isn't enough to hold the car. Either way you should never rely on the transmission alone to hold a car on an incline.

Tony, with your comment on it rolling back then stopping makes me wonder if it is also equipped with anti rollback. Was it decent size incline and can you feel the brake disengage when pressing the accelerator?

Unfortunately, all articles are still focused on reviewing the car instead of the technical details to find out.
The incline is very slight but enough to make the car move but only a little bit. The car does have anti-roll back feature.
Car was in park , NOT neutral .sitting in car when it rolled after 15 min or so. it states:- dealer pointed this out on page 142 and it says car can go into neutral hence use park brake .
You mean for 15 minutes the car held its position and then it just started to roll?
wow. That's insane.
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