ABC valve cleaning DIY MercedesBenz Forum | Mercedes-Benz catalog with specifications, pictures, ratings, reviews and discusssions

ABC valve cleaning DIY MercedesBenz Forum

12 Июн 2015 | Author: | No comments yet »
Mercedes-Benz SL 500 Base

ABC valve cleaning DIY

Car: Mercedes SL500

Symptoms: front drops 3-4” 1 hour after engine is after engine start car goes to normal. Red ABC ‘low warning message is displayed time I start the car but goes in 30 sec or so.

Since there where no leaks on shocks/lines it must be leak in ABC valve block. description of ABC suspension is here ABC

So after reading many I thought I should try cleaning before replacing them unit I can find was $1200 ESC tuning

here is place where rebuild them

It took 3 of pretty dirty and unpleasant but results are impressive – car stopped and ride became much stiff and sporty.

Because I find anywhere in internet on how exactly to clean ABC valve I thought I would write DIY sequence here:

1. Block raise front axe and remove left wheel and wheel

A lot of pictures can be found here


2. residual pressure with front wheels off the ground small bleeding screws on the shock lines

3. Now you are ready to remove valve and take it home for cleaning. are many ways how you can do it but here is I did:

a. Disconnect Line 1 and 2 from aluminum Block 1 Pic 1. To contamination in hydraulic system I put wrap/electrical tape at the end of each Oh and use gloves!

b. Remove 10 mm Bolt 1 holds Block 1 on bracket and connector to the sensor, slide 1 to the side

c. Remove Lines 3-5

d. There are 3 10 mm nuts which Valve block – now you can access and remove Valve Block

e. mark and remove 4 electric — they are fragile!

Mercedes-Benz SL 500 Base

f. Put tray under car — are not leaking badly but I got 0.5 l of oil over 2 4. Now with Valve Block off the car you can pressure damper and holding off (big black bulb and metal plates, all 10 mm)

5. Carefully block outside with and remove Plastic Clip holds valves together, clip between regulating is shown on Pic.2 (From I will write for Check only, Regulating Valves are Plastic clips are fragile! Use two of pliers to press them on sides and slide them out

6. Use adjustable pliers to carefully valve (garb at the VALVE to 45 degree angle: after wiggling it should come

7. There is a spring for each valve – do not miss them! of all valves taken apart is

8. Clean valve with tissue/ethanol, Pic.3, remove and clean its internal o-ring blue 0-ring was very Check valve seat for There are 3 areas which can leak: dirty valve leaking o-ring or weak spring. To be safe I stretched for a bit.

9. For regulating valves plunger is not so I just pushed it back and with pliers while with ethanol.

10. Put everything together (except front liner), check fluid in ABC tank, add Pentosin 11s if necessary. engine with wheels on the and stop after 1-2min for min, add more Pentosin. Now you are to bleed the system – slowly through height modes 15 it should be enough. Go check for around valve block. If are no leaks put liner back.

11. your beer and celebrate – you fixed your Mercedes and yourself $2000!

PS To be hones you don’t have to valve block to clean but it is just much easier to do so for the time

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