Citroen C5 2002 ABS sensor lights up after 50 yards

JesseJames_2

I don't think it has a bleed nipple.
Here is the same one which has photos at different angles.
http://www.ebay.co.uk/itm/CITROEN-C5-2-0-HDI-DIESEL-ABS-PUMP-MODULATOR-9641767380-4MH2K28861-2001-2004-/261814977209

arcon5

An bit of a cowboys way of doing it though is to bleed as normal, take on to some gravel or something and brake hard a few times to activate the ABS. Then bleed again. I say cowboys way as extreme care should be taken after as brakes will activate much lower.
Will only work if ABS is not on though.

arcon5

JesseJames wrote: »

Any gotchas in doing this especially steps to take to minimise fluid loss and bleed the system afterwards?

Regarding this point, wouldn't bother, you're gonna loose the fluid. Plus, the pump itself is of very high pressure, you really want to release this pressure before you start cracking off nuts.

Lorian

You really are going to need a Lexia/delphi or similar to bleed the pump. Clones are cheap enough on ebay.


And do make sure you get the right MK60 there are lots of versions.


Also it needs some basic setup - wheel size and a couple of other parameters.

JesseJames_2

Arcon/Lorian

Thanks for your input in the bleeding of the pump - these are good points to be aware of.

For a start the the auto engineer was very helpful, and offered to identify the pump if I gave him the Ebay listing, and part number of mine.
The stock model of this pump itself does not need reprogrammed.

arcon5 wrote: »

take on to some gravel or something and brake hard a few times to activate the ABS.
Then bleed again.
Will only work if ABS is not on though.

I don't follow you there Arcon, activate the ABS, but will only work if ABS is not on. - Can you elaborate on that point?

Lorian wrote: »

You really are going to need a Lexia/delphi or similar to bleed the pump. Clones are cheap enough on ebay.

Is that a type of diagnostics scan tool that Arcon refers?
How does that aid in bleeding the pump?

I am taking Thursday off to do the job at home, as the part should arrive by then - probably tomorrow or Tuesday in any case.

AdrianC

JesseJames wrote: »

I don't follow you there Arcon, activate the ABS, but will only work if ABS is not on. - Can you elaborate on that point?

He meant if the ABS light was not on. If the light is on, the ABS is disabled.

Is that a type of diagnostics scan tool that Arcon refers?
How does that aid in bleeding the pump?

Yes, Lexia is the official Citroen dealer diagnostic kit - there are some that have escaped into the wild. It bleeds the pump by telling the pump to cycle all the valves, getting air out of the internal chambers where it'll otherwise get trapped. Getting the ABS to activate, by locking the wheels, will do the same, but with the risk of the brakes being - umm - somewhat unpredictably less-than-effective whilst doing so, then being very squishy at best afterwards, until the car's back in the workshop and the air bled again. Even then, there may still be trapped air which won't be obvious or released, perhaps until the ABS is really needed, at which point it all becomes entertaining.

JesseJames_2

Thanks Adrian
The ABS light
I originally read that as the ABS activating.

That lexia kit and the bleeding of the brakes.
You explained that very well - I understand - now I see where Arcon was coming from.

I'll report back on Thursday. Hopefully all will be OK, otherwise it's a trip to the auto engineers and £50 (also currently a 10 day waiting list)

arcon5

Sorry, spot on Adrian, I meant the light. The ABS needs to be enabled. He's also answered your question spot on. There's some kind of valve, often a ball, it moves up in two stages, first to block inlet side to prevent the hydraulic pressure increase, then again which unblocks a lower chamber and allows fluid brake side to escape in to the chamber, thus releasing brakes slightly. Inside the chamber is another valve type mechanism which allows fluid to return to the reservoir... you need to open up these valves to allow air to move round and ultimately back in to the main stream where you bleed again the brakes.

If you don't you may find after ABS first kicks in the brakes are not as effective.

patman99

Don't know how much you paid for the new pump, but there is a reputable firm in Colchester that will fully overhaul one for the £200 mark.

They are so good, even the main dealers use them.

JesseJames_2

patman99 wrote: »

Don't know how much you paid for the new pump, but there is a reputable firm in Colchester that will fully overhaul one for the £200 mark.

They are so good, even the main dealers use them.

That's good to know, but hopefully I won't need to ask you the name of the firm.

The part came on Monday, but the brake unions were removed and a bit globby inside the holes, and I don't just mean the threads but the 2mm or so holes further in.
Gonna have to clean that now.