ABS acumulator replacement...

As mentioned before, my ABS pump was cycling on a regular basis (if you can call 5 seconds on, 5 seconds off regular) so it was time to give it an overhaul.

I'd already carried out the ABS exercising, ABS fluid change, ABS solenoid flush, and the ABS 'why is it still running??' swear at it. The first three had some, although temporary effect, and the latter no effect apart from amusing the girlfriend!!!

so more effective measured were needed. When I last flushed the fluid, i measured the fluid when I released the accumulator pressure, and I had over 150ml come out.. a sign the accumulator has lost some oomph, not surprising as it's 18yrs old! it would also account for the pump firing as soon as the ABS is activated...

I haven't got the official bleed tool, but with a 9mm 12point deep ring spanner and some tube, and being very careful, the same result can be had....

you should all recognise this...
http://i301.photobucket.com/albums/n...284800x600.jpg

the secret spanner....
http://i301.photobucket.com/albums/n...286800x600.jpg

pressure released (i had a tube fitted to the bleed nipple, AND released the spanner VERY GENTLY!) and the fluid collected gave me over the 100-150ml 'normal' accumulator capacity.. hence i had ordered a new accumulator assembly...

http://i301.photobucket.com/albums/n...282800x600.jpg

quite why honda UK wanted the best part of £900, and delivery in OCTOBER is beyond me, oh well, stuff the international trade deficit, it was ordered from across the pond, with a 5 day delivery!!!

now with the solenoids... previously the flushes I'd done, although thorough, never really got to the root of the problem, and after investigating nsxprime i devised a back flush gadget.

the nsxprime ones seemed overly complicated so using the KISS approach (Keep It Simple Stupid) I came up with this... first remove the reservoir...

http://i301.photobucket.com/albums/n...288800x600.jpg

then add a small machined reservoir with matching piston....
http://i301.photobucket.com/albums/n...289800x600.jpg

disconnect the pressure hose from the pump to the ABS unit (Banjo bolted hose) then fill the reservoir with fluid, activate a solenoid and push the plunger down....
http://i301.photobucket.com/albums/n...291800x600.jpg

repeat for the other 3 solenoids and it's done! so I did it again, just to make sure.

So solenoids back flushed, it was a case of removing the old accumulator, and fitting the new... the pump bracket had to come off too, to allow access to the accumlator mounts...
http://i301.photobucket.com/albums/n...293800x600.jpg

a bit of circus contortionism and the new unit is in and plumbed...
http://i301.photobucket.com/albums/n...296800x600.jpg

http://i301.photobucket.com/albums/n...295800x600.jpg

all that remained was to bleed the accumulator and solenoids, cycle it all a few times and check the levels.

result... now the ABS has enough reserve to run a few ABS activating stops before the pump refreshes the accumulator, and the pump hasn't run for quite some time!!! to the point that me and the girlfriend have to go 'clat-a-clat-a-clat' just to make up for it! :)

Top bananas Jonathan!!!
You're becoming a mini-sudesh/Kaz!

How much was the new accumulator?

Keep up the good post.

SS

NB. May need to pay you a visit when mine starts to play up.

Quote:

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Originally Posted by britlude

..... me and the girlfriend have to go 'clat-a-clat-a-clat' ...... :)

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what you do in the privacy of your own home / car is none of our business ;) :eek: ;)

Nice work Jonathan! Hope all is running fine now with the ALB.

Can I ask where or what, is that box where the clutch reservoir is or should be lol

Quote:

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Originally Posted by Sudesh

Can I ask where or what, is that box where the clutch reservoir is or should be lol

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Is an alarm Siren Sudesh, I have a similar one! :)

Quote:

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Originally Posted by AR

Is an alarm Siren Sudesh, I have a similar one! :)

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:doh: Stupid me lol

From that angle it looks like the clutch reservoir is gone or enclosed in the box. I take it the reservoir can be accessed ok?

Like the pump.
Quick question for the experts, is the sphere merely a hollow pressure vessel or does it have an internal diaphragm that retains a [say] a pre pressurised fluid that provides some of the pressure. The reason I ask is that Citroen IDs, DSs, BXs, XMs and the like have similar spheres[?] for their brakes and suspensions and their spheres can be recharged.

the sphere is much the same as the citreon suspension setup, with a diaphram and pressurised gas on one side, fluid pumped into the other. it's mounted with 3 screws, rather than the citreon 'spin-on' setup. yes i did think of that if parts were unavailable/prohibitively expensive! the accumulator, bracket and pressure switch were £350ish from the good ole U S of A!

I was expecting a 'what is the box' question!!!!. the alarm box is mounted at the top of the firewall, and anyway, being an auto, the clutch reservior isn't an issue!!!

oh, the ABS is vastly improved in both levels of performance, and levels of silence!!!

Quote:

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Originally Posted by britlude

the alarm box is mounted at the top of the firewall, and anyway, being an auto, the clutch reservior isn't an issue!!!

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Double :doh::doh: lol

That explains it :)

i'll let you off Sudesh, it's been a long day!