Rear Wont Raise On My C5

[morto]

just fitted to my 2.2hdi 2002 plate ive fitted a  new rear hydrolic ram and boot as the old one was leaking, it has the Hydractive hydraulic suspension 3+... front will rise perfect and rear will not rise , but will rise if i put the trolley jack under the back and give it a help and it will stay there, once i put it down it goes to the floor and stays there,, no leaks on the system , the front will level but the backs still on the floor, so .. sphere? or level sensor?  ive just ordrerd a new rear level sensor and will get that next tuesday.

thanks
Andy

 

[morto]

just thinking it could be the  Built-in Hydro-electronic Interface (BHI). the front works fine ? how hard to change the

 Built-in Hydro-electronic Interface (BHI). with maybe one from the scrapyard

[paul.h]

Have you put in extra LDS fluid to replace the amount lost and then taken the suspension up and down on the switch near the handbrake to bleed out any air ? In the Haynes manual it says to do this in the suspension low position, remove the LDS reservoir cap, top up the LDS fluid if needed and apply 0.5 bar of air pressure to the LDS reservoir, then start the engine, set the suspension to the high position, once settled set it to the low position, then check the level again and top up if needed.

 

If you put it back on axle stands, you could try freeing the rear level sensor since these can seize and need something like wd40 to free it. However, it is most likely due to air in the system and not the sensor or BHI. When the pump is running, all it is doing at the rear is compressing the air until it is all removed.

 

I also vaguely remember somebody on here who had a similar problem and overnight the fairies fixed the car and the suspension was back to normal height the next day - so may have been air in the system.

[morto]

thank you for your reply, ive WD40 the rear sensor and moved it by hand on the ball joints and all seems good, the front raises spot on so i did not think this was a pressure issue or im i wrong? do you think putting 0.5bar in the resevour will push the LDS to the rear? as said if i jack the back end up it will raise to the top but then when you press the switch to down it goes right down to the bottom and will not level.. is it worth me undoing the bleed screw at the back ..

 

thanks

            Andy

[morto]

thank you for your reply, ive WD40 the rear sensor and moved it by hand on the ball joints and all seems good, the front raises spot on so i did not think this was a pressure issue or im i wrong? do you think putting 0.5bar in the resevour will push the LDS to the rear? as said if i jack the back end up it will raise to the top but then when you press the switch to down it goes right down to the bottom and will not level.. is it worth me undoing the bleed screw at the back ..

 

thanks

            Andy

update on this ive put 0.5bar into the reservour and done what i should and made no difference , so its looking more like the height sensor

should get that on tue off citroen