alk247

Passenger side rear corner sags while car is parked, so it is clear that rear valve block needs refurbishment. Should I also refurbish front one preemptively while I'm working on the ABC? I also need to replace accumulators/dampeners. On one hand it is of the same age as the rear one, on another hand I normally follow philosophy of "don't fix what ain't broken".

It's 2003 SL500 with about 100k.

fooschnickens

May as well. The front takes a lot more "damage" than the rears since it carries more weight, and since you're doing accumulators anyway it will all be accessible.

viper1996

I am about to do the same thing...Gonna' do them both...And get it over with!

bobterry99

You might try running 2 15-minute Rodeo routines back-to-back, Alex, and when finished consider installing a new filter in the ABC reservoir.

ItalianJoe1

Not how that works, the leakdown is from poor sealing usually due to contamination. The seals are metal on metal, so there is a slight amount of leak that's "acceptable", for example if the car is parked for weeks and sags, it's normal. If there is a speck of dirt or o-ring material in the way it can make it go down in hours though.

Agreed, a good flush and rodeo solves a lot of the small issues with this system from time to time. Fluid quality and cleanliness is KEY to proper function.

gafitanu

bobterry99

I think we all know how these valves work, and the apparent discrepancy in the past two posts is just a matter of semantics.

The chambers in the valve housing are sealed closed from one another by o-rings. But the spool valve which controls the flow of hydraulic oil does so by creating/opening a metal-on-metal seal.