Steel brake pipe

[balimatharu]

I am encountered with another problem while  doing the front brake calliper.
The steel pipe that connects the left brake hose to the the calliper fractured as it was weakened by the rust.
Is it possible to repair the fracture.
Any comments would be appreciated.
I have taken a picture and is enclose as an attachment.
Thanks.
Bali

[Cees Klumper]

I don't readily recognize the part, but if it were me, I would look for a new part rather than try to repair this one. "Weakened by rust" is not a term I would want anywhere near associated with my brakes ...

[Mike K]

Fully agree with Cees. I would replace all of the pipes, it's only a matter of time before you have a problem.

The parts are all available, I renewed the whole brake system on my '71 280SL - new master cylinder, brake booster, new lines & stainless steel braided hoses, new calipers, discs & hand brake shoes.

[PeterPortugal]

Bali,

I believe that is actually a complete part which you can still buy. They vary year on year depending on the callipers fitted.

You should identify the part number and buy one.

Regards

Peter

[WRe]

Hi,
the pipe for the left side is still available at MB: A1084200028, 182,70€. Right side A1084200128, nla.
...WRe

[ja17]

These are the same on manyMB sedans of the era. You might be able to find a good used one.

[Shvegel]

I work on a ship.  My motto is "Go out whole, come back broken.  Go out broken, don't come back."  Unless you have a way to test it to high pressure don't repair ir.

[Anthony]

Both sides are available in reproduction.

[balimatharu]

Thank you all for the advice. I have ordered both sides from Mercedes. They are available. £ 150.00 each. Could have been worst.

[mauro12]

hi guys, I would like to refresh my brake system too and I was thinking about the brake pipes, especially the ones that are attached to the master cylinder. I found the full kit for sale on mbclassic.de for around 60euros but looking in the pictures , these pipes are straight and I was wondering how is possible to makes the perfect shape and curves especially when you attach them to the brake master cylinder. thank you
here I send you the link. https://www.mbclassics.de/brake-line-set-250SL-280SL

[dirkbalter]

hi guys, I would like to refresh my brake system too and I was thinking about the brake pipes, especially the ones that are attached to the master cylinder. I found the full kit for sale on mbclassic.de for around 60euros but looking in the pictures , these pipes are straight and I was wondering how is possible to makes the perfect shape and curves especially when you attach them to the brake master cylinder. thank you
here I send you the link. https://www.mbclassics.de/brake-line-set-250SL-280SL

You will have to straighten them first and than re-bend them.  The only advantage of buying a set is that the ends are already crimped with the fitting. If something goes wrong, you have to buy them again. (I like the copper nickel alloy lines better. Easier to bend and better corrosion protection.)

[WRe]

Hi,
brake line sets for our cars are usually delivered in the correct length, but usually not in the desired shape, i.e. you have to bend them yourself. There are helpful tools and youtube videos for this, where Kunifer lines (copper-nickel-iron) can be bend easier than steel lines.
...WRe

[mauro12]

Is it possible to bend by hands?
What do you means if something goes wrong you have to buy again ?

[dirkbalter]

Mauro,
I have done this and it is not really difficult. But, you may want to practice a little bit with some tubing before you start bending the final product. I don't think bending by hand will give you the desired results. Once you bend it (especially a small radius), it is difficult to reverse it and start over. That's why I said if something goes wrong, you have to buy new ones....   
Getting a bend tool is not expensive.
 https://www.amazon.com/Wostore-Handles-Aluminum-Stainless-Awesome/dp/B07LDY3V82/ref=sr_1_2_sspa?dchild=1&keywords=Tubing+Benders&qid=1619800500&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExOEwxUTlDRzJPSTY3JmVuY3J5cHRlZElkPUEwMzAwMjk2MzE3U0VSVDNVU1IyNCZlbmNyeXB0ZWRBZElkPUEwNTA3NTEyMzlZWE5TTUsyOElWSSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=
The lines in the kits you buy from SLS or whoever, are typically bend already somewhere for shipping. You will have to reverse (straighten) the line prior to final bending. If you go down that route, I highly recommend keeping and using your old lines as templates.
Hope that helps.   

[mauro12]

Thank you , I think is too much for me and I will let my mechanic doing this job . I was wondering why sls or mbclassic.de or others do not sell already with the correct shape .
I think it’s worth to replace the brake lines because they are quite cheap and after 50 years the corrosion has made his job .
What is the most difficult part to bend? Probably in the master cylinder attachment ?
I also noticed that when you disconnect the old brake fluid reservoir ( I have the earliest version from ate ) probably you need to buy some seals to seal the master cylinder to the reservoir . Here I found this kit, brake lines and seals. What do you think ?
https://www.mbclassics.de/installation-kit-early-brake-fluid-reservoir

https://www.mbclassics.de/brake-line-set-250SL-280SL

[doitwright]

Do not expect to find the brake line shown in the 1st photo to be included in a brake line kit. That special female fitting on the end is unique to MB.

[mauro12]

Which photo are you talking about ? They have on stock this entire set of lines . I think is for all front  and  back of the car . They go in the underside of the car too.

[mauro12]

Obviously the set of seals for the brake fluid reservoir is not included in the brake line kit , you have to buy separately

[dirkbalter]

Thank you , I think is too much for me and I will let my mechanic doing this job . I was wondering why sls or mbclassic.de or others do not sell already with the correct shape .
I think it’s worth to replace the brake lines because they are quite cheap and after 50 years the corrosion has made his job .
What is the most difficult part to bend? Probably in the master cylinder attachment ?
I also noticed that when you disconnect the old brake fluid reservoir ( I have the earliest version from ate ) probably you need to buy some seals to seal the master cylinder to the reservoir . Here I found this kit, brake lines and seals. What do you think ?
https://www.mbclassics.de/installation-kit-early-brake-fluid-reservoir

https://www.mbclassics.de/brake-line-set-250SL-280SL

I bought the same kit. My rubber parts were completely shot.
https://www.rmeuropean.com/Products/0005860143-MFG4-V8736.aspx

To me, it can get a little tricky when the bends are close to the fittings. I used to work (play) on British cars years ago. I bought pre-fabricated lines then and for sure at least one of them was to long or to short.  (May be that was when they were switching from inches to metric, lol). That's when I gave up and started to do them myself.
Considering the brake line that goes from the front to the rear is 2+ meters long, pre-bending and shipping it would make no financial sense?
Unless this is something you really want to do and learn, its is probably cheaper to let your mechanic do it. He likely has the tools.

[doitwright]

There are tools for straightening bends and waves in tubing. Tubing straighteners are available at Eastwood.

[mauro12]

Once you replace all lines and reseal the brake calipers, which brake fluid do you suggest? dot 4 or dot 5?

[FGN59]

The fluid originally recommended by MB is DOT4+. It should be labelled MB331.0. In Europe a corresponding product would be Febi Bilstein 23930 (I’m sure there are others, this is the one I buy).

Don’t know if with modern brake lines and callipers (including modern internal gaskets) you can use another kind.