Date registered: Aug 2009
Vehicle: 2003 SL55 AMG
Location: San Jose, CA
Mentioned: 0 Post(s)
Quoted: 14 Post(s)
Did the valve block job this past weekend. Decided to buy a used valve block from a low mileage car on eBay rather than having mine rebuilt or rebuilding myself. I found a guy on eBay that rebuilds for $125 but I don't have a place to park the car on jackstands while the rebuild was going on (apartment parking probably not the best place to leave a car on jackstands for a few days).
Found the bleed screw right away, it was behind the rotor close to the strut. I let that bleed for a few minutes, lots of dark hydraulic fluid came out which was surprising since I had done an ABC flush two weeks prior. I then started undoing the hydraulic lines, more dark fluid starting coming out, that went on for 10-15 mins. It was really hard to get some of the hydraulic lines loose because the rubber mounts of the valve block flexed so much and the torque was lost. They eventually did come off using the 17 mm flare nut crowfoot wrench attachment for a ratchet.
I cut fingers off some rubber gloves and slipped them over the hydraulic lines so no dirt could get into the lines.
Removing the accumulator before attempting to remove the valve block made it a lot easier to get access to the electrical connectors on the larger solenoids on the back of the valve block.
While installing valve block, I first connected and tightened the hydraulic lines that were further back so I could get my torque wrench in there without other lines restricting access. Tightened to 45 NM or 33 ft lbs. Connected the electrical connectors. Then lowered the car, it was totally slammed as expected, barely high enough to get my jack out from under it. Filled CHF11S to replenish the lost fluid that came out when removing hydraulic lines. Started the car for a few minutes, then turned it off and waited 15 mins. Checked hydraulic level again and topped off some more. Then started the car again and pressed ride height button, it immediately sprung up to the appropriate ride height. Cycled the ride height button a few times, went for a test drive and monitored sagging. No sagging so far but I want to let the car sit for 2-3 days and see if it sags.
I decided not to do another ABC fluid flush since i had done it a few weeks prior. The flush is what lead to the sagging in the first place so I don't want another flush to lead to more problems. I may replace the filter after a week or two of driving. I'd like to hear peoples opinions on whether I should flush again or not.