SOHC.co.uk Forums > CB350/400

Brake bleeder valve thread size?

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Mikep328:
I'm wanting to install a Stahlbus brake bleeder valve but don't know what thread size the OEM bleeder is.  Anybody know - M7x1x16, M8 x 1.25 x 16, etc?  Thanks!

McCabe-Thiele (Ted):
Never heard of Stalbus Valve, reads as a good idea though.
I'm surprised the sellers dont have an application chart.

I bought a set of these, very handy, don't know how I managed without them.
https://www.ebay.co.uk/itm/387257447219

Mikep328:
I use them on other bikes.  It more convenient/faster than futzing around with vacuum or pressure bleeders on such small systems.  I have both and use the pressure bleeder for cars but I can bleed motorcycle brakes faster using the bleeder valve when you factor in the time it takes to get the vac or pressure bleeder out, set it up and then put it back away.

McCabe-Thiele (Ted):

--- Quote from: Mikep328 on June 04, 2026, 05:49:47 AM ---I use them on other bikes.  It more convenient/faster than futzing around with vacuum or pressure bleeders on such small systems.  I have both and use the pressure bleeder for cars but I can bleed motorcycle brakes faster using the bleeder valve when you factor in the time it takes to get the vac or pressure bleeder out, set it up and then put it back away.

--- End quote ---

When you have used the bleeder valve to get a good air free lever feel,  do you then swap back to the standard one or do you leave it in place?

Mikep328:
"When you have used the bleeder valve to get a good air free lever feel,  do you then swap back to the standard one or do you leave it in place?"

It replaces the standard bleed screw permanently. 

Attach a tube from the bleeder valve to a cup/plastic bottle, whatever; open the top section of the bleeder 1/2 turn; pump the brake lever until no bubbles (ensuring master cylinder doesn't run out of fluid); tighten top section; remove tube.  There is no need to open/close the bleeder as you pump the brake lever.

As I said, on a motorcycle it's much faster than pressure/vacuum bleeders simply because there is no time involved in getting the equipment out/putting it away.  This would NOT be the case with a car; pressure bleeder is much better!!!!

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