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MG MGB Technical - DIY Pressure Bleeder

This might help in bleeding hydraulics. I used this for the clutch but no reason it can't work for brakes as well.

Before I installed the new M/C. I bench bled it.

I built the pressure bleeder from a small glass jar. I drilled two holes in the lid; one for a tire valve and one for a rubber grommet to hold the flexible tubing. I use 1 fiit of tubing and put one ebd all the way to the bottom of the jar. I sealed around the valve and grommet with a toluene sealant/adhesive. I filled the jar with fluid, closed the lid tightly, opened the bleeder on the slave and attached the other end of the tubing.

In my first attempt I tried using a hand pump but I was unable to genwerate enoough pressure.

On my second attempt I ran my compressor up to 20 PSI and that worked very well. Put the air hose on the tire valve and the air pressure will push the hydraulic fluid up the flexible tubing into the slave cylinder. I pumped fluid through the slave until the master reservoir was full.

I got great movement with no additional bleeding.

PS. Since I'm from Kentucky, I used a cherry jar that had done its duty in making Manhattans. I suspect any jar will do!

Dan Hiltz

You just recreated the Gunnison E-Z Bleed system, but saved yourself a hundred dollars. Simple, but effective. RAY
rjm RAY

100 dollars? £20 GBP, 25€.

Can't beat diy though! About 20 psi is usual for Eezibleed.
John Bilham

Not too keen on the idea of pressurising a glass jar with compressed air.
I've seen the unfortunate results of a compressed air failure of an aluminium vessel with a plastic cover (like a drum). I imagine if glass lets go under pressure you wouldn't want to be anywhere near it

John
John Minchin

I made mine for use with a bicycle pump.
Michael Beswick

Like John I would be careful re glass jars. Perhaps a food preserving jar, like Fowlers (I think that was it) my mother used to cook her preserves in. From memory they were rated to a specified pressure given the expansion/contraction of fluids during the cooking/cooling process.

The lids had a clamp to seal the rubber lid gasket during the cooking phase. There would be plenty of room either side of that for the tubing inserts.

Regards
Roger
R Taylor

This thread was discussed between 27/07/2013 and 30/07/2013

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