Refilling and bleeding PAS
Discussion
I'm having a few problems. Please can somebody point me in the right direction?
I've probably put half a litre of PAS fluid into the reservoir, but it doesn't seem to be dropping much. The steering is much lighter than before, but its very noisy and judders. I've been turning the steering wheel from side to side with the lid of the reservoir off to try and get the air out, but it doesn't appear to do much, other than make a noise and judder.
What am I doing wrong? There is only one way to put the Jonny Z hoses on the reservoir, so it can't be that???
I've probably put half a litre of PAS fluid into the reservoir, but it doesn't seem to be dropping much. The steering is much lighter than before, but its very noisy and judders. I've been turning the steering wheel from side to side with the lid of the reservoir off to try and get the air out, but it doesn't appear to do much, other than make a noise and judder.
What am I doing wrong? There is only one way to put the Jonny Z hoses on the reservoir, so it can't be that???
Andav469 said:
I'm assuming that you have the engine running and the front wheels are off the floor, if so, keep at it, it will release the air, mine took an age to clear as well.
Good luck.......
Cheers for that.Good luck.......
Errr, engine running, but wheels on the floor. I'll have another go tomorrow, jacked up this time!
I had a similar problem once with Bleeding a PAS system on another car, Luckily for me I work in a R&D centre and have a few friends in the Chassis team. so here's what I can pass on...
Start Engine:
Car on wheels.. turn steering lock to lock, then bump the steering wheel (quiet hard) on to the full lock positions (left and right) do this a few times quickly, but for no more than 10 seconds as these positions are at full pressure on the PAS pump and rack. The PAS fluid will heat up quickly due to this high pressure in these postions, and you do not want to cook the PAS oil.
Stop Engine:
Next step...
If you look at the PAS fluid reservoir and see tiny air bubbles stop!
Deep breath.... go for a cuppa and come back after ten or so minutes and check for air bubbles, if they have gone, then repeat above full lock bumps. then check for air again. If air bubbles are still visible - go for lunch and come back in an hour
This should cure your problems. Also check for leaks around your hoses and connector between the rack and high/low pressure pipes.
One other comment... If your PAS pump starts making odd noises then it is likely that contamination has entered your PAS system and it will not be long before your pump expires - we are talking microns PAS systems are very sensitive 
Start Engine:
Car on wheels.. turn steering lock to lock, then bump the steering wheel (quiet hard) on to the full lock positions (left and right) do this a few times quickly, but for no more than 10 seconds as these positions are at full pressure on the PAS pump and rack. The PAS fluid will heat up quickly due to this high pressure in these postions, and you do not want to cook the PAS oil.
Stop Engine:
Next step...
If you look at the PAS fluid reservoir and see tiny air bubbles stop!
Deep breath.... go for a cuppa and come back after ten or so minutes and check for air bubbles, if they have gone, then repeat above full lock bumps. then check for air again. If air bubbles are still visible - go for lunch and come back in an hour
This should cure your problems. Also check for leaks around your hoses and connector between the rack and high/low pressure pipes.
One other comment... If your PAS pump starts making odd noises then it is likely that contamination has entered your PAS system and it will not be long before your pump expires
- we are talking microns PAS systems are very sensitive Will try both methods when I get another hose fitted. That banjo joint was a right PIA to re-thread. A least I should manage it without removing the pump this time.
What I did notice (for the short period) is that the PAS made steering much lighter than before, which is probably due to a kink in one of the old hoses. It sounds stupid, but the old hoses actually felt better to me. Just enough to take the weight off the steering for slow manoeuvring but still maintaining feel at higher speeds.
Has anybody semi-restricted any hoses deliberately to achieve this and would it have any long term effects?
What I did notice (for the short period) is that the PAS made steering much lighter than before, which is probably due to a kink in one of the old hoses. It sounds stupid, but the old hoses actually felt better to me. Just enough to take the weight off the steering for slow manoeuvring but still maintaining feel at higher speeds.
Has anybody semi-restricted any hoses deliberately to achieve this and would it have any long term effects?
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