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Owner: Warren Tomlinson
apparently to put my VK disc brake diff into my VB i have to remove the check valve in the rear outlet in the master cylinder....
What exactly is the check valve?
It is a small olive shaped bush inside the outlet for the rear brakes. Do a Search on here on Check valve to get the info' on how to remove it. It has been covered hundreds of times. It might even be in Holdenpaedia.
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Hey mate i had a look at the car today (searched here and couldnt find anything) and undid the front and rear outlets and they both look the same, do i have to actually pull the master cylinder apart or what?
One Life, One Chance
Please check with the brake specialists - i think as of the clear PBR master cylinder all that stuff is out the door
By late 70's the cup design in the rear wheel cylinders had changed, they no longer need some slight pressure form the master cylinder to keep then slightly expand / on
the extra wide lip of the new shape rubbers stops air leaks and does not retract as far as the older 60's 70's style
PS plus these clear PBR ones have inbuild pressure regulator
the check valve is not the brass olive seat ,the check valve is behind it and is small black rubber one way valve , you remove the brass seat by getting along self tapping screw with a flat washer on it screw it in to the brass seat a tiny bit then lever it out with 2 screw drivers , then remove the rubber check valve which maybe sitting inside the brass seat or be just behind it YOU THEM MUST RE FIT THE BRASS SEAT REMOVE THE SELF TAPPER AND RE FIT THE SEAT, WITH OUT THE CHECK VALE.
THE MASTER cylinder shown in the workshop manual as long been replaced with a a newer design , so dont worry if yours dose not look the same.
is the check valve in the actual master cylinder or is it in the start of the brake line?
The workshop had me wuite confused when it was a different design. Thanks for all the help, i'll hopefully get this done this weekend.
What exactly does the check valve do out of curiosity? Is it some sort of device that alters the pressure in the brake lines?
its a one way valve it restricts fluid from returning back up the line from the drum brakes , but with discs you need the fluid to be able to return back up the line or the brakes will drag on..
In the Master Cylinder.
So i undo the brake line from the master cylinder, then screw a self tapper into the master cylinder a little bit ane lever it out and then the rubber check valve should be there, remove that and put it all back together. Is that about right?
yes thats it , just use a self tapping screw that will fit fairly easy without damaging the brass seat ..
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