Pagoda SL Group
W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: Pinder on December 26, 2015, 14:46:29
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During rebuild of my engine I accidentally cracked the plastic pipe from the booster to the manifold. I found what I think is a very good replacement at home depot in the plumbing section they carry a semi transparent whitish colored pipe that has an internall diamiater that is an excact fit and look to the original. It comes in 25 foot lengths in a coil but its was was very reasonably priced at $8. Hope that helps for anyone wanting to change out there old yellowed hose. Its a shame it didn't come in shorter lengths.
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that pipe needs to be able to hold vacuum without collapsing. Is it the case of the one you found?
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Yes I its flexible but not collapsible. I believe it to be the same material. it is similar to underground sprinkler piping but is the right colour / transparency.
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I'm not a stickler for originality, but are you talking about the line from the rear of the intake manifold to the power brake booster? That line was not originally transparent. It is rubber with woven cord on the outside and a check valve and a condensation bottle in line. The line from the intake to the valve cover breather was translucent.
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Jon the Merciless (ala Chuck Taylor...) must chime in here. The early 280 SL still had the woven type vacuum line (with the cotter style clamps, the check valve and the condensation bottle. The later cars (don't know the cut off) had the white-ish translucent line from the booster to the vacuum connector on the intake, there is a small check valve, but no condensation bottle.
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Yes thats the one Im talking about . I didnt know if its original or not., from the yellowing its pretty old. I have a 70 and 69 both have it.
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My concern would be the compatibility of the Home Depot plastic line for the booster vacuum application. The Home Depot plastic material is undoubtedly meant for water exposure. The original plastic booster vacuum line possibly for oil and gasoline fumes. Not sure about plastics but for rubber, water and gas/oil exposure require different materials. Might want to check it out.
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My concern would be the compatibility of the Home Depot plastic line for the booster vacuum application. The Home Depot plastic material is undoubtedly meant for water exposure. The original plastic booster vacuum line possibly for oil and gasoline fumes. Not sure about plastics, but for rubber water and gas/oil exposure require different materials. Might want to check it out.
Agree!
While replacing the fuel injectors recently, I accidentally broke the plastic vacuum pipe at the check valve connection. There were cheaper (most probably inferior) options available. In the end, given that it forms part of a critical function of the braking system, I forked out the $50- to buy the Cohline OEM pipe with all fittings. It's just not worth the risk in order to save a few $$.
Best,
Mike
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Thats interesting. I always thought they came with the clear pipe not black.
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Autohauz has a good price for the OEM line for around $35 with check valve and new ends.
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I'm not a stickler for originality, but are you talking about the line from the rear of the intake manifold to the power brake booster? That line was not originally transparent. It is rubber with woven cord on the outside and a check valve and a condensation bottle in line. The line from the intake to the valve cover breather was translucent.
The early cars had a metal PCV line which often became rusty and plugged up. Later ones were black plastic or at least all the ones I've seen so far.
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While we're on this vacuum line subject, i.e., line, check valve, water separator, connector at booster, I have another rant and a question for the experts.
I've seen somewhere here, a couple of comments regarding the color of the right angle connector at the booster. My late 1966 230SL has a white connector with built-in check valve (but badly painted black), so it's probably not original. The line also has a long cylindrical check valve, not a little black and white flying saucer or spinning top shaped check valve, in the line between the white water separator and the intake manifold vacuum fitting. Two check valves in series sounds to me to be a little paranoid (over-kill), so I assume someone wanted it to function and look right in the absence of correct parts.
The EPC part number for the booster vacuum line connector on my late 66 230SL is A 000 430 36 81 and is black without a check valve built in (I just bought one from Authentic Classics). There was a very, very early change but I can find no photo of the early one and it was changed to the 000 430 36 81 about 10,000 cars before mine was built, so that doesn't explain why mine was white with a check valve, unless it came from another car.
The in-line check valve EPC part number is A 000 431 35 07 and shows up on the Authentic Classics site as the little black and white flying saucer or spinning top type, not the longer cylindrical type like mine (which is on all the early MB corporate 230SL photos). I hate it when they do that (change the part without changing the part number).
This appears to be another one of those curses that have settled on me since I've been trying to reconcile the EPC, the BBB, the parts suppliers' parts catalogs, the logical function of the car and the way my car was built (or repaired sometime in the past). This problem is confusing like that recent 230SL glove box hidden vs visible inside screw head conflict between the BBB and what everyone but me knows is right, or the other recent 230SL Clutch Fluid Reservoir Fill Cap Correctness conflict between the EPC, original 230SL factory photos, and the BBB. I'm talking about the ribbed vs scallopped and black vs white reservoir fill cap.
These things started out as me thinking my car was repaired with incorrect parts sometime in its past, but now I'm almost convinced that Mercedes Engineering in the 1960s were their own worst enemy when it came to keeping track of what parts they were building their cars with. This seems to be a three way battle among the EPC, the BBB and Mercedes Sales Brochure photos.
Does anyone have a good handle on the various iterations of brake booster vacuum hose design, including the hose(s), check valve(s), water separator and booster connector?
Tom Kizer
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Well. I guess I opened up a can of worms. still interesting to note that both the 69 and 70 280 SL that I have had originally when I purchased them the semi-transparent pipe (that is very yellowed.
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Lots different polyethylene types in the world. I would rather trust Mercedes to pick one.