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Thread: LAD suspension hose from bomb to shock

  1. #1
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    LAD suspension hose from bomb to shock

    What the snot-nobbles is its name? because I NEED it.

    Its the hose from under the car to the ride height for the suspension and i've dug and dug but NADDA! lol.

    Clues?

    -dLs-

    http://www.partsgeek.com/catalog/199...sion_hose.html

    Parts geek wins again. Napa had nothing, nor did auto zone.

    -dLs-
    Last edited by shogun; 08-11-2015 at 08:08 AM. Reason: Automerged Doublepost

  2. #2
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    Druckschlauch links 37121137321
    Druckschlauch rechts 37121137322
    that parts is pretty expensive, even at partsgeek. Find a hydraulic shop which can recrimp it. Some people in Germany use brake hose and make an adapter for it with brake line. Cuts the price by 50%. Do NOT use normal hose, that must be hydraulic pressure hose, the pressure in that area is pretty high!
    Last edited by shogun; 01-24-2024 at 06:53 PM.
    Shogun tricks and tips for the E32 series are HERE!

  3. #3
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    I use 400psi hose. Its all of like $3.50 a foot.
    OMG! I freaking love you shogun (no homo). I was wondering if you could do that! omg omg omg! I am not worthyyyyy!!
    Last edited by shogun; 03-09-2021 at 07:53 PM.

  4. #4
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    that is not enough!!! 400 Psi = 27.22 Bar only. The regulating valve has following specs:

    there are 2 valves actually inside the regulating valve on the rear axle. The minimum pressure valve opens when the pressure behind the valve = towards the rear shocks and bombs falls below p = 30 bar. That is already higher than your hose can stand. And the overpressure valve inside the regulating valve opens when pressure at bombs abd shocks and the lines there exceeds p = 130 bar!!!!

    I have on my car new pressure hoses crimped for that by a hydraulic shop ( a friend in Germany) which can stand 200 BAR = 2900 psi, original ones with safety reserve are layed out for 180 bar.
    Do you have a crimp press or someone who can crimp them? A hose clamp there will fly away, that are not low pressure hydraulic hoses where hose clamps are used.

    1 psi = 0.06895 bar
    1 bar = 14.50326 psi
    180 bar = 2610.54 psi
    Shogun tricks and tips for the E32 series are HERE!

  5. #5
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    Mind = blown right meow.

    You seriousl?! That little pump is creating 180 bar of pressure?! geezus. I will have to see what the shop here locally has for HP hoses from semi's then because that is FAR higher than even I expected. God damn. (pardon my french)

    -dLs-

  6. #6
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    Ther power steering pump creates 130 BAR, but all the power steering hoses and LAD hoses are with safety reserve and layed out for 180 Bar max working pressure. But the bursting pressure is about 4 times of the max working pressure.
    Here you can see for example that a hydraulic hose with a max. working pressure of 225 bar has a minium bursting pressure of 900 ! bar
    http://www.advancedfluidsolutions.co...r1at-518-p.asp

    Be reminded: if your LAD hoses burst, you lose all the power steering fluid and the LAD fluid, power steering failure, maybe even the power steering pump could be damaged.
    Not to speak of the danger on the road for motor bikes because of the lost fluid on the street
    Last edited by shogun; 01-16-2013 at 12:57 AM.
    Shogun tricks and tips for the E32 series are HERE!

  7. #7
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    Quote Originally Posted by shogun View Post
    Be reminded: if your LAD hoses burst, you lose all the power steering fluid and the LAD fluid, power steering failure, maybe even the power steering pump could be damaged.
    Not to speak of the danger on the road for motor bikes because of the lost fluid on the street
    It burst on an expansion joint on a bridge and I wasn't even driving funny thats the sad part. It was at about 70mph.

    I know my fear about the PS pump being damaged...but i dont wanna think about that. I need to fix the line asap so i can drive again.

    Thank. God. I. Am. Single.

    why?

    Cuz this is what i'm doing:


    -dLs-

  8. #8
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    Shogun once again offers great advice on the proper way to fix this. Unfortunately it's a bit more difficult to find places to do things (crimping hydraulic lines on a car) the right way around here, as competition here is driven more by doing things for less money rather than doing things better.


    The normal person way to fix this problem is to go to the junkyard and get some non-SLS shocks and then close the loop for the SLS fluid circuit. That should be about $40 for the shocks and $3 for the hose to close the SLS circuit. I did this on my E38 when I installed coilovers and it worked great.

    1995 540i/6 // Dylan Leff - www.originalplate.com


  9. #9
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    Quote Originally Posted by mojocoggo View Post
    Shogun once again offers great advice on the proper way to fix this. Unfortunately it's a bit more difficult to find places to do things (crimping hydraulic lines on a car) the right way around here, as competition here is driven more by doing things for less money rather than doing things better.

    The normal person way to fix this problem is to go to the junkyard and get some non-SLS shocks and then close the loop for the SLS fluid circuit. That should be about $40 for the shocks and $3 for the hose to close the SLS circuit. I did this on my E38 when I installed coilovers and it worked great.
    I know what you mean and i live in a town in rural california with like 15,000 people within the city limits. lol.

    Unfortunately people at the junkyard see BMW's as gold mines. I would be charged about $60 for the shock and about $10 for any part there-after that isn't a 'main piece' for $30 more i could get the unit from partsgeek and keep what I have. NOT to mention the part may be damaged in the yard or any number of other things. Honestly a used piece for $30 less than the new piece? To me, that isn't enough of a gap to be cost effective.

    Like I said, i often spend MORE money on my car than I need HOWEVER I have found, done properly once, for a hair more often leads to better results when I have limited resources or places I can trust.

    This is also why i drive about 350 miles one way (ukiah, ca to medford, or) to have a mechanic work on my car. Point in case? He fixed my passenger rear suspension that was leaking out the top, did a head gasket job, did the valve stem seals, installed the radiator, changed fluids, ran the diagnostics (he has the snap-on tool for the car and its -really- weird port) and did all my brake pads and lathed my rotors. All of that cost me $300 (plus the $155 for the radiator). NOT bad for what I got. It sucks the alternator was showing a charge at idle to 1,200 rpms or he would have done the alt+belts for me as well. But I did have to cut him short by a week.

    -dLs-

  10. #10
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    Ordered the $90 part from PartsGeek on 1/17/13 and used "Ground" shipping from their warehouse in NJ. It arrived THIS morning on 1/18/13...da fuq?!! THAT IS AWESOME! Not gonna lie, this surprised me.

    -dLs-

  11. #11
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    just for price info
    37121137322BMW Pressure Hose Assy Right $67.99
    37121137321 BMW Pressure Hose Assy Left $67.99
    brand new, unused Genuine BMW part
    https://www.fcpeuro.com/products/bmw...ft-37121137321


    I got them special made by someone with higher spec than original: my hydraulic hoses are designed for operating pressure 315 bar! and bursting pressure >1000 bar!. Hydraulic pipe-8x1mm, each 30cm Hydraulic hose -NW6mm, the hydraulic hose with ends to screw in the pipe, nuts/cutting ring = Schneidring in German , 2 Screwed nipples = Schraubnippel for 8mm pipe.
    Similar as the pic above. So I can in future re-make just the hydraulic hose section.
    Shogun tricks and tips for the E32 series are HERE!

  12. #12
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    In case someone needs one cheap, there is a new one on Ebay for $39.33, BMW OEM 88-91 735iL Rear Suspension-Hose Left 37121137321 E32 Hydraulic ,eBay item number:301768361581 , seller: jvdfarzin
    Shogun tricks and tips for the E32 series are HERE!

  13. #13
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    and now both are no longer available
    37121137322 BMW Pressure Hose Assy Right
    37121137321 BMW Pressure Hose Assy Left
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  14. #14
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    Quote Originally Posted by shogun View Post
    and now both are no longer available
    37121137322 BMW Pressure Hose Assy Right
    37121137321 BMW Pressure Hose Assy Left
    Jeez parts for these cars have been going NLA like crazy over the past 5 years

  15. #15
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    not a too big problem with this, get a standard hydraulic hose for the same length with connections, hydraulic hose should stand 180 bar, bend a 8mm brake line and make the connections, see here in post 22 a larger pic from the German forum
    http://www.7-forum.com/forum/showthr...light=schlauch
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  16. #16
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    Hope nobody minds me resurrecting this thread. I need to replace both of mine and this thread has answered most of my questions. I tried to follow the link to the german site but couldn't see the photos. Does anyone know what the pitch and thread size is for the connectors. I believe mine are threaded at both ends (No banjo fittings) bomb and shock.

    Thanks in advance.

  17. #17
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    the pic on the German site just shows the old and new hoses, no details for pitch and thread size. Take the bomb and the old hoses to a hydraulic shop as samples and they will make a fitting hose for you with the correct fittings. The hydraulic system has 130 bar and the hose is originally designed for 180 bar. For my 11/88 750iL these hoses are / are not available http://bmwfans.info/parts-catalog/E3...wse/rear_axle/ for LAD (not EDC)
    pressure hose left 37121137321 NLA ,pressure hose right 37121137322 NLA, For vehicles with Rough suspension version NLA left 37121137321 right 37121137322

    from 09/1991 the pressure hose for LAD 37131137190 L+R is used. This is a bit different than the version before 09/1991, but can be modified, the bracket on the LAD shock for the hose must be a bit modified, see drawing below, also NLA, but on this BMW dealer site it says: 37131137190 has been replaced by PRESSURE HOSE ASSY Part Number: 37131137136 p/N: 37131137190 Supersession(s): 37131137190 Fits E34 525i / 535iAutomatic/Manual, Sedan; E32 735i/iL Automatic/Manual , BMW 740i /iL, 750 i/iL 1988, 1989, 1990, 1991, 1992, 1993 https://shop.bmw.ca/p/BMW__/PRESSURE...131137190.html
    changes on older LAD bracket when using hose from 09/1991
    Attached Images Attached Images
    Last edited by shogun; 03-09-2021 at 10:22 PM.
    Shogun tricks and tips for the E32 series are HERE!

  18. #18
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    moroza is offline MORΩN ΛABIA BMW CCA Member
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    The hose ends have threads M14x1.5 male DIN/ISO bubble flare "leicht" (as opposed to "schwer") at the strut, M10x1.0 male DIN/ISO bubble flare at the accumulator. The link in my sig details aftermarket adapters I had to buy to get off-the-shelf (and American) parts to fit the stock strut and pressure line, with custom accumulators.
    Last edited by moroza; 03-11-2021 at 06:55 AM.

  19. #19
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    Here are some pictures of all three hose versions.

    The oldest version (to 09/1987) is still available from BMW. The middle version (from 09/1987 to 01/1991) isn't. The most recent one (from 09/1991) is available on eBay.

    Fun question: Which version does a car manufactured on 7 Sept 1987 have? I gambled, bought the "to 09/87" hoses and lost. If I can find a hydraulic shop here in Montreal that can make those flanges I might get the hoses modified: cut off the last 90° bend and make a new flange. Or I might buy the most recent ones. In either case, I would also need custom brackets as shown in Shogun's posting above.
    Attached Files Attached Files
    Last edited by kce1900; 08-17-2023 at 12:54 PM. Reason: added another p/n

  20. #20
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    take the most recent ones from 09/91 either side: 37 13 1 137 190 either side: 37 13 1 137 136
    and make yourselves new brackets based on the above drawing I posted. Or ask BMWHarald in Ger, he may be able to make them for you, he mentioned to me : Hallo Erich, ich habe mir die beiden Bleche einfach selbst gebaut! War recht einfach und hat wunderbar funktioniert. Dazu habe ich mir ein 2mm starkes Alublech besorgt und die Teile entsprechend COBs Zeichnung ausgesägt. Dann noch drei Bohrungen angebracht, entgratet und umgebogen – fertig! In Summe war das Herstellen der Halter weniger Arbeit als das Erstellen der CAD-Zeichnung. Gruß Sascha

    I built myself the two sheets! Was quite simple and has worked wonderfully. For this I got a 2mm thick aluminum sheet and sawed out the parts according to COBs drawing. Then drilled three holes in it, deburred and bent over - finished! In sum, the manufacture of the holder was less work than the creation of the CAD drawing. Greeting Sascha

    Or find a shop locally which modifies your new (wrong) ones, I assume a shop which makes brake lines can do that, they have all the tools for flaring and bending brake lines and also the connectors, same stuff like brake lines.
    Shogun tricks and tips for the E32 series are HERE!

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