1985 300D rolls away when put into park - PeachParts Mercedes-Benz Forum

frybenz · #1 02-02-2010, 08:31 PM

When my Benz is put into park, it still rolls away. Is this an easy fix? I am fairly mechanical, I just replaced my B2 piston. Any ideas?

whunter · #2 03-08-2010, 01:00 PM

Moved from good MB shops to DD for answer..

toomany MBZ · #3 03-08-2010, 01:21 PM

There is a pawl (#15) on an interlock (#10) with a spring (#20) inside the rear transmission case.
It seems the pawl is not engaging the interlock.
Good luck.

charmalu · #4 03-08-2010, 01:53 PM

I agree with the above fixes and suggestions.

Iam wondering if the parking brake is being applied? It is a wonderful tool to use

.

I see it all the time, people park their automatic vehicle, slam it into park and jump out, then see the vehicle rocking back and fourth. puts an awful strain on the Pawl in the transmission. Put the strain on the parking brake, then select Park.

Charlie

andrewjtx · #5 03-08-2010, 02:15 PM

My wagon started doing this after I replaced the transmission mount. I had new bushing already in from earlier last year and park always worked well. I think with a brand new mount, the linkage is a little off and needs to be adjusted.

If I push forward on the shifter. it locks into park, but won't stay there.I'm not looking forward to working in the tunnel again, so this is on the back burner at the moment.

Parking brake still does its job.

okyoureabeast · #6 03-08-2010, 03:03 PM

My 85 300D does something like this.

When I put the car into park and if I let off of the brake the car will slide and then I can feel the parking paw grab the car to a halt.

I've been using my e-brake when I park my car instead of just relying on the transmission. It's a habit I got myself into and I don't remember how or why I did.

biopete · #7 03-08-2010, 01:12 PM

Hmm. All i can think is the linkage adjustment. Does it roll only backwards by any chance? Then it could be still in reverse. You probably thought of this. I'm assuming it starts right up when it park so it is not thinking it is in reverse?

whunter · #8 03-08-2010, 01:19 PM

Quote:

Originally Posted by frybenz

When my Benz is put into park, it still rolls away. Is this an easy fix? I am fairly mechanical, I just replaced my B2 piston. Any ideas?

I would suspect bad shift rod bushings = failure to reach the park position.

Broken Neutral Safety Switch and replacing shifter bushings
http://www.peachparts.com/shopforum/diesel-discussion/96048-broken-neutral-safety-switch-replacing-shifter-bushings-post646647.html

Replacing all shifter bushings on W126 - p.1
Replacing all shifter bushings on W126 - p.1

FYI:
I have them in stock local detroit.

Have a great day..

vstech · #9 03-08-2010, 08:57 PM

I grew up in rural SD... it gets cold there.
we got in the habit of NEVER using the parking brake. because it had a nasty tendency to melt snow and such from the road, and freeze in position. and the brake would not release.
I know it's silly, but this year, many many many unsuspecting southerners had their cars unable to move, for this very reason. it was on the news, and I had myself a good laugh!

Skippy · #10 03-08-2010, 09:01 PM

Quote:

Originally Posted by vstech

I grew up in rural SD... it gets cold there.
we got in the habit of NEVER using the parking brake. because it had a nasty tendency to melt snow and such from the road, and freeze in position. and the brake would not release.
I know it's silly, but this year, many many many unsuspecting southerners had their cars unable to move, for this very reason. it was on the news, and I had myself a good laugh!

Shortly after I moved here from Georgia I had that happen to me. Luckily I had another car that was not so afflicted and was able to get to work. At the time I was in a training class which included a Canadian. He made fun of me.

turbobenz · #11 03-19-2010, 03:55 AM

Quote:

Originally Posted by vstech

I grew up in rural SD... it gets cold there.
we got in the habit of NEVER using the parking brake. because it had a nasty tendency to melt snow and such from the road, and freeze in position. and the brake would not release.
I know it's silly, but this year, many many many unsuspecting southerners had their cars unable to move, for this very reason. it was on the news, and I had myself a good laugh!

put it in drive and go, the ice will melt

pawoSD · #12 03-19-2010, 07:02 AM

Quote:

Originally Posted by turbobenz

put it in drive and go, the ice will melt

Agreed!

vstech · #13 03-19-2010, 10:36 AM

Quote:

Originally Posted by turbobenz

put it in drive and go, the ice will melt

yeah, um, that's not really an option on well adjusted ebrakes...
sometimes you can backup to get friction that will melt the ice. but forward is usually beyond the capabilities of the vehicle.

okyoureabeast · #14 03-19-2010, 11:02 AM

Quote:

Originally Posted by vstech

yeah, um, that's not really an option on well adjusted ebrakes...
sometimes you can backup to get friction that will melt the ice. but forward is usually beyond the capabilities of the vehicle.

Seriously? There was so much snow in Ithaca this year and the temperatures were well below freezing. I've never had such an issue of the parking brake freezing. Heck even when I did some driving at 2am with the engine stone cold there weren't any problems.

What about cars that have a manual transmission? How are they supposed to park in the freezing cold???

vstech · #15 03-19-2010, 11:12 AM

Quote:

Originally Posted by okyoureabeast

Seriously? There was so much snow in Ithaca this year and the temperatures were well below freezing. I've never had such an issue of the parking brake freezing. Heck even when I did some driving at 2am with the engine stone cold there weren't any problems.

What about cars that have a manual transmission? How are they supposed to park in the freezing cold???

I usually put it in first or reverse on a manual.
I wasn't saying it was an everyday thing, just in superfrigid temps, (waaaaay below zero) after driving through snow and such, the accumulated water can seize the ebrake. it happened to enough this winter that the announced it on the news in the south...