S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

ABC line failure

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Old May 1, 2026 | 07:33 AM
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S600, GL450, GLC 43
ABC line failure

Well after 22 years I finally had the dreaded ABC main line failure under the engine. $3300 later she is perfect. Why in the world Mercedes would put this line in an in accessible spot is beyond me, but alas I was VERY lucky for many years.
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Old May 2, 2026 | 10:29 PM
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OP if you haven't given it accumulators; do so.
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Old May 4, 2026 | 10:15 AM
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2005 S500 Designo
This is the first one, there are 2 or 3 others that are about to fail - they are the high pressure lines (not the supply line). Replace those.
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Old May 5, 2026 | 02:46 PM
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OP any shop that builds hydraulic lines can make them up for you. Take a line from the car and they will make it up using better materials than were available when your car was new.
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Old May 7, 2026 | 02:39 PM
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It’s too late he already had it done.


For other people, and the future,All you need to do is remove the ends of the existing line, then have a hydraulic or forklift repair shop make up a new hose using the existing ends of the hose.it usually cost about $100. And you don’t have to reroute it under the engine.

you can leave the existing hose with its cut off ends sitting where it is.

Last edited by tusabes; May 7, 2026 at 02:40 PM.
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Old May 16, 2026 | 08:51 AM
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Originally Posted by tusabes
you can leave the existing hose with its cut off ends sitting where it is.
Leave a hose that has hydraulic fluid in it after cutting of the ends. That won't make a mess forever.

FIX THE CAR CORRECTLY OR HIRE SOMEONE WHO IS ABLE TO.
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