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

ABC & Steering: Stiff/Harsh

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Old 12-10-2022, 12:47 PM
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2015 S550 4MATIC
ABC & Steering: Stiff/Harsh

Moved this to the AMG forum, apologies!

Last edited by sushistrip; 12-10-2022 at 01:11 PM.
Old 12-13-2022, 03:44 AM
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CL 600 '00 5.8L V12
Have you flushed both the ABC and the power steering system?
Old 12-13-2022, 09:29 AM
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The power steering fluid is clean as a whistle. The ABC fluid is pretty dark, so I'm going to flush this weekend and see where that gets me.
Old 12-13-2022, 08:01 PM
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You're saying both the ABC suspension is stiff *and* the power steering is stiff?

These are two separate systems, both of which shouldn't fail individually. The one common denominator is the pump, but within the "pump" are actually two pumps. Is the belt slipping? Are there any ABC warnings on the dash?
Old 12-13-2022, 08:34 PM
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Steering is light for the first 2 min of driving then gets stiff. Kind of tells me the pump can't handle it.

Previous owner put an ebay pump in it. If that's the case then a fluid flush should improve things a bit, but probably not all the way. We'll see after the flush.

I feel like a belt slip would throw a code with sudden drop in pressure.

Last edited by sushistrip; 12-13-2022 at 08:37 PM.
Old 12-14-2022, 03:37 AM
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Originally Posted by sushistrip
Steering is light for the first 2 min of driving then gets stiff. Kind of tells me the pump can't handle it.

Previous owner put an ebay pump in it. If that's the case then a fluid flush should improve things a bit, but probably not all the way. We'll see after the flush.

I feel like a belt slip would throw a code with sudden drop in pressure.
Ok, give us more information on what exactly is going on. The car is new to you, it has an eBay rebuilt pump. The hard steering is intermittent. There's no point in guessing here.
What exactly is the story with the car; is this your first ABC car?
Old 12-14-2022, 12:35 PM
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eBay pump is a giant red flag.
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Old 12-21-2022, 02:23 AM
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There are guides online on how to restore your ABC pump to new
Old 12-28-2022, 07:57 PM
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Originally Posted by tim687
There are guides online on how to restore your ABC pump to new
Where? If you bring something like this, it would be nice if you would post a link so we know we get the one you're actually talking about and not some random ding dong under a tree making a youtube video with his phone.
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