Replacing hose / Pipe from Brake booster to intake

[dpreston Virginia]

I purchased a nice new white pipe to run from the brake booster to the intake (check value in line). See yellow pipe in photo.
It's a very stiff pipe any suggestions on how to instal? I know I need to cut to fit but what then?
Will the old one just pull off and the new one push on?
Thanks for any help. Its for a 111 but its the same pipe as the 280SL.
David

[Pawel66]

Try dipping in hot water. That is how I did that. You may not be able to play a piano the next day.

[wwheeler]

Hi David,

I see what you are talking about now. Looks like the hose goes over barbs on the connections. Easiest way to remove is to carefully cut the plastic tubing over the barb. I would not cut through the tubing, just score it deep enough so that it is easier to take off. And yes, to install, soak in hot water as Pawell recommends. Plastic will soften dramatically with higher temperatures and how plastic is molded in the first place. You don't want really hot and not above 170*F. Above 200*F, most plastics will melt.

The check valve on the car is the original style. If you want to keep original, you can easily test that to see if it works. The replacements I have seen fit just fine but are different in appearance.

BTW, you can buy transfers for your Bosch relays that has the part number on the front and wiring schematic on top. I think Bud's Benz has them. They are dry transfer and easy to install.

[dpreston Virginia]

Thanks Pawell and Wally for your great advice. Will carefully cut the hose and add the new one.
Also excited to put in the new bright white brake reservoir, washer tank and clutch reservoir. No more yellow.
I’ll post back once I am done.
Not ready to pull the trigger on the transfers on the relays quite yet they were pretty pricey the relays did shine up pretty nice.
Thanks again for the help.
David

[mrfatboy]

There is a DIY procedure that I used in the tech manual for relay decals if you find the transfers pricey. Sweat equity 😁

https://www.sl113.org/wiki/Electrical/RefurbishRelay

[Pawel66]

Yes! Relays decals from our Technical Manual work just fine.

On the hose: check length and shape carefully so that it does not touch the bonnet.

Also: check 5 times the direction of the check valve...

[dpreston Virginia]

I wanted to update my post on the brake booster hose and my engine beatification project for my 69 280SE 111.
The Brake Booster hose isn't an easy task. I had to use my torch to get the old one off and again use the torch to soften the new one up to reinstall. Hot water didn't touch the hard plastic pipe.
You have to be careful not to distort the pipe but the torch made the instaillation possible.
The photos show before and after (center photo)  and to date all that I have done. I still have a few woven hoses to replace and do the relays but the engine bay is much better not concours of course but looks better.
Thanks for the help!

[Montreal V8]

   Caution - may upset purists.  I always thought the hose looked like an expedient and unsightly "addition".  Feeling thus, I carefully shaped a coated steel tube from the intake around the front of the engine. Left enough of a gap to install flexible hose to install the valve, and allow for engine movement. Have done many miles since, without any incidents.

[wwheeler]

I think this was another cost savings change. The booster hoses from the earlier cars were metal wire reinforced and they used the old cotter pin style clamps. The new plastic tubing was less expensive and took a fraction of the time to install at the factory. And no clamps!