Rebuilding a Doseur / brake compensator valve
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Author:  Vanny [ 28 Feb 2015 ]
Post subject:  Rebuilding a Doseur / brake compensator valve

I've finally got around to overhauling a doseur valve for the BX having had the last remaining seals from Citroen around 6 months ago. The donor came from a non running car so I've no idea if it works or not, but it looks in reasonable condition;


The procedure its self was quite straight forward and I simply followed the appropriate section of the Citroen Work Shop manual, which offered some good tips on how to do some of the trickier operations. The relevant section can be found here;

Firstly the body was cleaned up as much as possible before removing the old pipe unions;


Then the doseur was disassembled in accordance with the manual. The only bits was a little stumped on is that it refers to a 'bearing race' that has to be taken out carefully. Actually this is inside what the manual describes a 'shuttle' and neither removable or serviceable! It also took me a little while to be able to see the teflon ring that has to be removed to get to the rear ward seal. The picture below shows the shuttle removed from the centre, and the groove where the teflon and rearward seals should be.


The Teflon seal is part number 95 495 759 and the rearward seal is 7903065984. I didn't replace the seal in the end car as these are no longer replaceable. The manual actually suggests that this part only needs a clean, and as it came out freely I'm confident it will be fine.

And that's it, as BX hydraulic refurbs go, its very simple. Its worth noting that the valves and the body are a matching pair, so once they've worn each other out, they can't be repaired. If you've got a really bad return leak (and sinking back end) then changing the the seals might help shift dirt if its blocking the valve, but in all likely hood wont make any difference.

I guess I'll know if its a working valve when i fit it next week!

More pictures HERE (including the parts number list and diagram)

Write up on the XM forum

Write up on the wonderful Citroen BX DIY pages

Original topic on BX Project

Author:  Philhod [ 02 Mar 2015 ]
Post subject:  Re: Rebuilding a Doseur / brake compensator valve

Yeah done these a few times Vanny. It's not as hard as it looks really. As to your last comment. I never used any new parts, just cleaned them all in xylene (petrols better Xylene can fuck the Teflon). and stuck them back together and they all worked fine.

The only thing I managed to cock up once was ripping the rubber end cap with the screwdriver getting the locking ring out :oops:

Author:  Vanny [ 28 Sep 2015 ]
Post subject:  Re: Rebuilding a Doseur / brake compensator valve


Well just how many doseur valves does one man need?

While the rebuild went smoothly, on fitting to the car the leak back spigot on the bottom of the doseur came free.

It would appear to be an interference fit which no longer interfered. Unfortunately after many attempts (in situ) i just couldn't get the spigot to take.

Fortunately Mr the Doc provided me a replacement in July, which is finally on the car and for the first time, the brakes seem pretty damn good and without the arse end hitting the deck after the slightest hint of deceleration.

Author:  jayw [ 28 Sep 2015 ]
Post subject:  Re: Rebuilding a Doseur / brake compensator valve

Don't suppose one of those is available for nappy tokens?

The athena's is dicking about from sitting for a year I think.

Author:  Vanny [ 29 Sep 2015 ]
Post subject:  Re: Rebuilding a Doseur / brake compensator valve

Always, remind me at the weekend

Author:  jayw [ 29 Sep 2015 ]
Post subject:  Re: Rebuilding a Doseur / brake compensator valve

I shall!

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