C5 2001 mk1 brake bleeding

[bighairybloke]

Can someone point me towards a guide for bleeding the brakes please, I’ve tried for an hour or more and 2liters of dot4 and still have air somewhere, this is after replacing the abs unit and the reservoir drained out completely. I’ve use Lexia and the abs bleeding process and not making any progress!

Cheers

Steve

[Paul-R]

I was under the impression that Lexia would guide you through the process and tell you which bleed nipple to slacken off in a certain order. Certainly that was what happened using Diagbox (not quite the same I know) on my brother's Peugeot 508SW.

[bighairybloke]

Yes this is what I did, I went round in circles using tons of fluid and still air in the system. I must be missing.

[cit-rotti]

There is a simple method that can sometimes help to bleed the ABS properly.
Apply the brakes firmly and fully several times on an unpaved gravel road – you will then feel very clearly that the ABS is engaging.
Then bleed the system using a suitable air compressor – bleeding via the pedal is never the best method.

[bighairybloke]

Will give that a go then get it back up on the scissor lift if no joy.

[Sloppysod]

I found pressure bleeding worked on mine when I just changed the fluid, didn't have diabox at the time too.

I have an old (very old) easy bleed tool, it pressurises the master cylinder using the spare wheel as a pressure source.

WOW, still make it!
https://www.gunson.co.uk/Product/G4062/Eezibleed-Kit

[bighairybloke]

Sorted it in the end, a positive pressure bleeder kit + me pushing the pedal like the old days and my mate bleeding each in turn:-)

[aspire_helen]

Just a reminder......there are 2 separate bleeding processes (1) bleeding the primary brake circuit and (2) bleeding the ABS....they are 2 different processes.
(1) is the normal bleed of the calipers in turn and does not need Lexia. I always use the 2-man process, one on the pedal, the other opening and closing the bleed screws. (2) is the ABS bleed which needs a Lexia. Normally, only (1) is necessary. However, (2) is needed whenever the ABS unit is compromised or the brake fluid reservoir is drained too low.
With an ABS bleed, the first thing Lexia asks you to do is bleed the primary circuit. Then it leads you through the ABS bleed which requires 5 series of multiple pumping of the brake pedal (10 times each series) with the front caliper bleed screws open or closed. Hence, you will need ready access to both front wheel bleed screws with a bleed tube and bottle on each. Lexia will have you up and down, opening and closing the bleeds screws and pumping the brake pedal. It will take time (and hence a fully charged battery) and at least 2-3 litres of fluid, more if you have to restart the process. When Lexia deems you have completed the whole process, you then need to bleed the rear caliper primary circuit. Note - the ABS bleed process is accomplished via the front calipers only, not the rear.

[bighairybloke]

Yeah,
Following the usual bleed with two men, we also ran the abs and bled them again.