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Discussion Starter #1
I have a major leak at the rear of my convertible top, and with resultant inability to close the top. Can anyone help me with the part number I need for the piston replacement. I went through the forums and it appears that I would not have to flush the system afterwards. Is this correct? Also, where is the fluid reservoir?

Thanks. Any help is appreciated![:)]
 

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Black SL 500 1994
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The Hydraulic pump & reservoir are under your spare tire in the boot.
Don't know about the flushing.
See this post for a good source of Hydraulic cylinders

http://www.mbnz.org/forums/forums/thread-view.asp?tid=1223490&posts=2&fid=25
 

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'03 SL500, '03 SL55, '97 SL320, (2) '91 300SL, (2) '91 500SL, '00 S500 -- all for sale
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Refer to the attached diagram. Part numbers are:

2 = 129 800 21 72
3 = 129 800 21 72
5 = 129 800 20 72
9 small/upper cylinder = 129 800 17 72 (left), 124 800 02 72 (right)
9 large/lower cylinder = 129 800 02 72
10 = 129 800 16 72

If you are buying new, I highly recommend checking prices from Don at Calibermotors -- the link cited above by ErikFinn. You might also check with Phil at mercedesshop.com -- the "buy parts" link.
 

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RE: Still available?

Your nuts to replace a bad cylinder with a 13 year old one. How long do you think the used replacement will last before you have to replace it too?

Buy new. I got one a few years ago for $120.
 

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90 SL 300/96 SL 320 / 98 C 280
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RE: Still available?

The hole assembly is 450.00 +/- for the front ones new. But just the piston will be much less.
and don`t be taken like me by replacing the hole thing, on both sides.
and than he asked me if he should can the old ones?
Well there is nothing wrong with them besides the piston. [8D]
 

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'03 SL500, '03 SL55, '97 SL320, (2) '91 300SL, (2) '91 500SL, '00 S500 -- all for sale
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The prices of cylinders varies widely depending on the cylinder!

Don at Caliber sold me one for the front lock recently for about $130 (129-800-16-72) and the one for the compartment cover for about $175 (129-800-16-72). The most expensive cylinder is for the main top drive (129-800-02-72): $401.
 

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300SL-24 1992 White;BMW X3-3.0 E83 2005 Blue;190E-2.6 1992(sold); BMW 316-1.8 E30 1983(sold)
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The most expensive cylinder: 129 800 17 72

costs more than $700 !:eek:
 

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Rebuild Cylinders

Why don't you have a mechanic remove your old cylinders, and send the old ones (all of them) to Dennis Ficken to be rebuilt good-as-new?

Save yourself a lot of money.

Search my posts for my problem and solution.

Good Luck!
 

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1987 560SL Gone but not forgotten! & 1999 SL500 For Now
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Searobin said:
Why don't you have a mechanic remove your old cylinders, and send the old ones (all of them) to Dennis Ficken to be rebuilt good-as-new?

Save yourself a lot of money.

Search my posts for my problem and solution.

Good Luck!
Searobin, I wholeheartedly agree and would add, 'better-than-new', as Dennis warrants his rebuilds for 3 years vs. MB parts warranty of either 90 days or 1 year at best. I think Dennis has made discussion of 'retail' largely irrelevant, except if the cylinder is so damaged during removal that it can't be repaired; then having these alternate sites to buy a replacement cylinder may come into play.

Bob
 

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Hi there,

I'm new to this forum stuff and also thanking God that i stumbled on this site, you don't know how many times i have received great info here. I have a '91 500sl and a month ago we replaced the two top struts (parts # 129 800 16 72), noticed this afternoon we now have a leak dripping from right behind the left rear tire. I'm not very good with cars and saw the above diagram, am wondering which part is likely to be leaking... There seems to be many hydraulic pistons in the car and i'm kinda at a loss for which one i have to replace. I's # 3 or 5, not sure which but thought one of you guys might know which to check first. Is it difficult to replace, more difficult than the top struts?

Please forgive my car ignorance, any suggestions will be highly appreciated!!!

Melissa
 

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Y2K SL500 Silver
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stlouis said:
I have a '91 500sl and a month ago we replaced the two top struts (parts # 129 800 16 72), noticed this afternoon we now have a leak dripping from right behind the left rear tire. I'm not very good with cars and saw the above diagram, am wondering which part is likely to be leaking... There seems to be many hydraulic pistons in the car and i'm kinda at a loss for which one i have to replace. I's # 3 or 5, not sure which but thought one of you guys might know which to check first. Is it difficult to replace, more difficult than the top struts?

Please forgive my car ignorance, any suggestions will be highly appreciated!!!

Melissa
There are a total of 12 each hydraulic cylinders(HC) that either move the top(10) or the rollbar(2). It turns out that you have replaced the two most common HC, and easiest to DIY. Because I have a 2000 SL I have yet to expierence your problem but there are more than several other Forum members who are fighting the same issue. If you decide to DIY you may want to read http://www.benzworld.org/forums/r129-sl-class/1316677-car-leaking-can-anyone-i-d-what-pics.html#post2348759. You may also want to take a look at http://www.benzworld.org/forums/r129-sl-class/1316677-car-leaking-can-anyone-i-d-what-pics.html#post2349844

I have tried to put all of the posts into one in order to make it easier to determine how you want to handle your problem. If you DIY you will probably need to pull all the rear paneling behind your seats and contact a fellow by the name of Dennis F. (his contact info is in the posts) who repairs these very costly cylinders at a very resonable price. If you were to purchase them new the MSRP would be $3500.00 less tax for parts alone. I can't even begin to imagine the total labor cost but I have read that the two fron latch cylinders that you replaced can cost $1200-$1500 at a Stealership.
 
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