I have two, they were assembled one each way.
I have two pics off the net, same thing.
It does matter, there's a piston in the piston.
I'm too lazy to work out how it works to then decide.
GM Brake prop valve piston which way ?
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GM Brake prop valve piston which way ?
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Ignorance leads to confidence more often than knowledge does.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Re: GM Brake prop valve piston which way ?
The bottom pic in your post shows the valve/shuttle pointing backwards as the pintle sticks out the end of the valve body.
One cutaway
cutaway diagram
two more cutaway versions
62-67 Nova cutaway
If you use google, insert "before:2023" and then type in your search, you can get a lot of images of proportioning valves. I used "before:2023 GM brake proportioning valve cutaway" and came up with the cutaways and diagrams.
In the big picture, if the barrel with the o-ring is backwards, you'll either get premature rear brake lockup or the brake light will come on during bleeding and never go off (if the ignition is on), requiring a reset and reassembly with the o-ring barrel position reversed.
One cutaway
cutaway diagram
two more cutaway versions
62-67 Nova cutaway
If you use google, insert "before:2023" and then type in your search, you can get a lot of images of proportioning valves. I used "before:2023 GM brake proportioning valve cutaway" and came up with the cutaways and diagrams.
In the big picture, if the barrel with the o-ring is backwards, you'll either get premature rear brake lockup or the brake light will come on during bleeding and never go off (if the ignition is on), requiring a reset and reassembly with the o-ring barrel position reversed.
Re: GM Brake prop valve piston which way ?
Cheers, looks like this is an Aussie only version, quite a bit different to the US one.
Ignorance leads to confidence more often than knowledge does.
Nah, I'm not leaving myself out of the ignorant brigade....at times.
Nah, I'm not leaving myself out of the ignorant brigade....at times.