CLK-Class (W209) 2003 on: CLK 270 CDI, CLK 200K, CLK 200 CGI, CLK 240, CLK 320, CLK 350, CLK 500, CLK 550 [Coupes & Cabriolets]

Brake Booster Vacuum Hoses - Part ID

Old Jun 9, 2023 | 07:20 PM
  #1  
Jerry Easley's Avatar
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'00 CLK320, '01 ML320 Designo, '01 ML320 Sport; '04 CLK320 Coupe Avantgar; '04 C230 SportCoupe (HB)
Brake Booster Vacuum Hoses - Part ID

RE: small white hose/line in this photo

What is:
  1. the name?
  2. the function?
  3. the termination of the other end?
  4. part number, if known?

In my ‘04 CLK it has chafed through with a 1/2 inch section carved away. Length is still intact.


Further: Transmission will only shift out of Park when started if done immediately, in sequence.
  1. Brake depressed
  2. Ignition to Start
  3. Immediately move selector lever

If there is a delay, it will not allow shift.

If returned to “P” with engine still running:
  1. With brake depressed and held it will allow shift into and out of “P, no problem.
  2. If brake is not depressed, it will not allow shift out of “P”.

Manual Shift Release works just fine.

Shift pattern/behavior while driving is correct.

Opinions and experiences welcome.

Please identify the “white hose/line”.


I have 2 each 2001 ML320 (same engine/same transmission), neither have this small white line coming from the brake booster vacuum port.


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Old Jun 12, 2023 | 02:40 AM
  #2  
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W209 CLK 270 CDI ELEGANCE 6 gear manual transmission
hello jerry, i will check on EPC and post he photo here and the part numbers.
but i remember that vaccum line is used also for headlamp adjustment.
did you received the mail with the PDF of the brake booster assembly?
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Old Jan 31, 2024 | 05:22 AM
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W212 E63
What is the info on the pipe that Jerry has asked about? I have a 14 E63 where this pipe disappears in to the engine bay fuse box. After 3 days of not using the car, I was doing some other maintenance and removed the small pipe from the brake booster. When removed I heard air moving in the pipe. I thought this was a bit strange with the car being turned off for so long.

Any ideas?
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Old Jan 31, 2024 | 06:10 AM
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W209 CLK 270 CDI ELEGANCE 6 gear manual transmission
hello, if you can upload a photo please. If is the same of W209 there is a balck pipe made of hard plastic and it connects on a vacuum pump on the engine, thats why there's air on that pipe after 2/3 days
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Old Jan 31, 2024 | 02:42 PM
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W212 E63
Originally Posted by Clk_master
hello, if you can upload a photo please. If is the same of W209 there is a balck pipe made of hard plastic and it connects on a vacuum pump on the engine, thats why there's air on that pipe after 2/3 days


I know the black plastic pipe is from the vacuum pump. What’s the grey pipe for that goes in to the fuse box from the servo?
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Old Feb 1, 2024 | 06:14 AM
  #6  
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W209 CLK 270 CDI ELEGANCE 6 gear manual transmission
can you PM me the VIN i will check on EPC
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Old Feb 1, 2024 | 06:48 AM
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W212 E63
After a bit of investigating under the car, it turns out it's got aftermarket, valved, exhaust back boxes fitted. I wasn't told about these when I bought the car.
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Old Feb 1, 2024 | 07:48 AM
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W209 CLK 270 CDI ELEGANCE 6 gear manual transmission
ok thats solved it looked suspicius grey was not factory. I wonder if that affect the vacuum pump for brakes
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Old Feb 1, 2024 | 08:07 AM
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W212 E63
Yeah, mystery solved With the pipe being grey and not like any of the other pipes in the engine bay, I didn’t think it was genuine. I know what it’s for, on mine anyway, now. It might be getting disconnected and blanked, depending how loud the exhaust is.
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Old Feb 1, 2024 | 09:12 AM
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Clk_master's Avatar
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W209 CLK 270 CDI ELEGANCE 6 gear manual transmission
the 63 sound great, straight pipe here in italy gasoline benz are rare specially 500, 550 and 63. 2.2 CDI are full 2.7 Liter is rare here where I live
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Old Feb 1, 2024 | 10:42 AM
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Jerry Easley's Avatar
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Yesterday, while away from my PC, I composed a reply to jasegarn Post #5 on my iPhone, was getting ready to send it this AM (USA Central Time) - and I see he has found the answer.

For my Original Post: The small white tubing at the brake booster provides 'power' for the rear-passenger headrest "Fold" action. It is a vacuum actuated latch initiated from a dashboard switch. (The 'hint' for it's purpose was from a suggestion on another forum.)

(Always keen to learn more about these early-aught MB's. I have 5 total and love them all.
2000 CLK320 22,000, 2001 ML320 (Designo, and a Sport) 190,000 on each, 2004 C230 SportsCoupe 114,000, and 2004 CLK320 72,000)

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Old Feb 1, 2024 | 11:43 AM
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W212 E63
Originally Posted by Jerry Easley
Yesterday, while away from my PC, I composed a reply to jasegarn Post #5 on my iPhone, was getting ready to send it this AM (USA Central Time) - and I see he has found the answer.

For my Original Post: The small white tubing at the brake booster provides 'power' for the rear-passenger headrest "Fold" action. It is a vacuum actuated latch initiated from a dashboard switch. (The 'hint' for it's purpose was from a suggestion on another forum.)

(Always keen to learn more about these early-aught MB's. I have 5 total and love them all.
2000 CLK320 22,000, 2001 ML320 (Designo, and a Sport) 190,000 on each, 2004 C230 SportsCoupe 114,000, and 2004 CLK320 72,000)
Ahh, that will be why there is the tapping already in place on the brake servo connection. I have seen it blanked off on other photos instead of having the pipe on like mine.
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Old Feb 1, 2024 | 11:49 AM
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W212 E63
Originally Posted by Clk_master
the 63 sound great, straight pipe here in italy gasoline benz are rare specially 500, 550 and 63. 2.2 CDI are full 2.7 Liter is rare here where I live
It does sound a bit better now with the valvetronic pipe blanked off Not sure I'm gonna stretch to Cat deletes though.
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