As some of you may remember reading I had the SC/MAC sphere replaced because I thought it had lost pressure and was the reason the car sank quickly. The replacement resulted in some improvement: the car rose up faster after short and prolonged (overnight) standstill.
The next thing I decided to undertake was cleaning the hydraulic system with Hydraurincage. Almost immediately the trouble started. Braking, driving over rough road surfaces, taking a curve at some speed would stiffen up both front and rear suspensions accompanied by distinct clacking noises from underneath the vehicle. I recognize these sounds as emanating from the regulators. I am pretty sure the electronics are in good order. I presume the cause to be loss of pressure which closes the hydraulic valves inside the regulators. Continuing to drive on a smooth surface things return to normal, smooth suspension.
I checked the return tubes to the LHM reservoir and noticed quite a bit of leak back from tube #3, which is the one from the brake valve. There is a constant drip at a rate of at least 2 drops per second.
Could it be the doseur already WAS leaky before I replaced the SC/MAC sphere and the problem exacerbated by the cleansing action of the Hydraurincage?
Full Version Brake valve and Stiffness regulators
Hi Jan,
Leakage from the brake doseur is normal (witness the oft previously reported mess made in the scuttle area when the rubber end button perishes and splits on LHD cars). I have seen somewhere a figure for the upper limit of what is an acceptable leakage rate, but can't lay my hands on it (may have been about 4ml/min). All I know for certain is that I measured mine in January 2006 (on LHM) at 2.5ml/minute and that was within the limit. Depending on how you define a 'drop' volume (say 1/20 ml, your leakage rate on Hydraurincage could be about 6ml/minute. This rate may be less on LHM depending on the relative viscosities of LHM and Hydraurincage.
Citroen (did?) sell the seals and rubber end button for overhauling the doseur valve and I have the w/s manual instructions if you require them.
Ken
Leakage from the brake doseur is normal (witness the oft previously reported mess made in the scuttle area when the rubber end button perishes and splits on LHD cars). I have seen somewhere a figure for the upper limit of what is an acceptable leakage rate, but can't lay my hands on it (may have been about 4ml/min). All I know for certain is that I measured mine in January 2006 (on LHM) at 2.5ml/minute and that was within the limit. Depending on how you define a 'drop' volume (say 1/20 ml, your leakage rate on Hydraurincage could be about 6ml/minute. This rate may be less on LHM depending on the relative viscosities of LHM and Hydraurincage.
Citroen (did?) sell the seals and rubber end button for overhauling the doseur valve and I have the w/s manual instructions if you require them.
Ken
Thank you, Ken, for your response. I do have the w/s instructions for the overhaul of the brake valve, but I think I'll ride out the few months with the Hydraurincage in and then see what happens when the LHM is back in.
I was just wondering if anyone had experienced the erratic behaviour of the suspension with the flushing oil in.
I was just wondering if anyone had experienced the erratic behaviour of the suspension with the flushing oil in.
QUOTE (Jan-hendrik @ )
Thank you, Ken, for your response. I do have the w/s instructions for the overhaul of the brake valve, but I think I'll ride out the few months with the Hydraurincage in and then see what happens when the LHM is back in.
I was just wondering if anyone had experienced the erratic behaviour of the suspension with the flushing oil in.
I was just wondering if anyone had experienced the erratic behaviour of the suspension with the flushing oil in.
No, but the system does seem smoother now it's on LHM+ again.
I suspect your problem is just low hydraulics pressure caused by a worn out regulator spring.
Check the system pressure is at 175Bar cut out, 145 Bar cut in.
QUOTE
I suspect your problem is just low hydraulics pressure caused by a worn out regulator spring.
Check the system pressure is at 175Bar cut out, 145 Bar cut in.
Check the system pressure is at 175Bar cut out, 145 Bar cut in.
You might be right.
Now where is my pressure gauge and adapter set? Oh yeah, I sold it when I sold my DS 15 years ago thinking I would never need those things again
Problems solved - for now 