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Registered 2005 SLK350
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Discussion Starter · #1 ·
I park the SLK - gearstick to 'park' - handbrake fully on.

Release my foot from the brake pedal and the car moves about a few inches forward or back depending on the slope.

This, to me, says 'engine/tranmission mounts'.

If so which is the main culprit? - I assume Transmission.

If not - what could it be?
 

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Founding Member 2006
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2005 SLK350
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2,562 Posts
I park the SLK - gearstick to 'park' - handbrake fully on.

Release my foot from the brake pedal and the car moves about a few inches forward or back depending on the slope.

This, to me, says 'engine/tranmission mounts'.

If so which is the main culprit? - I assume Transmission.

If not - what could it be?
If the handbrake is fully set and the car rolls then it is not doing its job. Either the cables have seized and not actually set the brakes or they are out of adjustment. Do a test by having the car on a slight decline, leave it in neutral, set the hand brake, and then release the foot brake. Does it roll?
 

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Registered 2009 SLK350
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96 Posts
The SLK handbrake is quite poor in my experience and when parking on a hill the car will roll slightly before being stopped by the gearbox pawl.

I generally release the footbrake slowly to ease the stress on the pawl although they are pretty tough things!
 

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I was surprised how poor the handbrake is in my SLK. It recently passed an MOT so, it must be OK but, I did search here for a guide on adjusting thinking there would just be a nut to tighten under the car. When I saw what was needed to adjust it, I opted for having my local independent Mercedes specialist to do when I have new discs and pads fitted in the the next couple of months. Its an auto so, it wont go anywhere in park :wink:

It does seem like Mercedes added the handbrake as a vanity item in the SLK LOL.

Mine does the couple of inch roll forward when in park and, with the handbrake pulled reasonably up. Pulling it up to the roof solves that so Im guessing the handbrake is your problem Thuvir.
 

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I park the SLK - gearstick to 'park' - handbrake fully on.

Release my foot from the brake pedal and the car moves about a few inches forward or back depending on the slope.

This, to me, says 'engine/tranmission mounts'.

If so which is the main culprit? - I assume Transmission.

If not - what could it be?
Well, if the car moves at all, you need to have your handbrake checked becasue it isn't working.

I am assuming this car has an automatic transmission. If this is the case an inch or even three of movement is not usual. The pawl that locks the transmission (https://en.wikipedia.org/wiki/Parking_pawl) engages a feature in the transmissions output shaft and locks the shaft in place. However, there is almost always some movement of the shaft before the pawl is fully engaged. There is also some "slop" in the rear end gears and the drive shaft and axle joints and the interconnections between them. The rear wheel rotate something like 4.6 degrees for each inch of vehicle movement. You might get a degree or two of play in the axle shafts, more in the various joints between the axles and the differential, another degree in the actual differential, and the rest from the drive shaft and movement of the transmissions output shaft before the pawl is fully engaged (the output shaft moves around 3x as fast as the axle shafts and wheels, so 4.6 degrees at the wheels is over 14 degrees at the transmission). And even with good transmission and motor mounts, the engine will rock slightly. You will also get some movement from the suspension relaxing. And finally, the drive train comments (drive shaft, axles, gears, etc.) are made from metal and metal deflects under force. The cumulative deflection for everything from the pawl to the wheels will be more than you think. All this means noticeable movement when you release the foot brake after placing the transmission in park is not unusual if you are on a non-level surface. The steeper the incline the more movement. However, if your parking brake is working and properly engaged, none of this would matter, becasue the wheels should be locked at the rear uprights and the only movement might be because of a slight shift in the calipers and the suspension relaxing. This would be a very small movement, and ordinarily not noticed.

If you are only talking about an inch or two of movement, I would not worry. If you are worried about the motor mounts, you could open the hood (engine off, car in park) and watch the engine while someone rocks the car back and forth.

Ed
 
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