Here you go guys, bit of persuasion with a blow torch and breaker bar got it apart.
There is a lot of bits inside but its fairly straight forward, with the unit tilted the ball bearing sits on a rubber o-ring completely sealing the outlet going to the caliper. In the normal position it rests against the metal end plate on the inlet side so its not completely sealed, and there are also four small holes on said end plate. Kind of makes sense as fluid will need to pass in that direction when you release the brake otherwise they would stick on.
The unusual bit is the washers on each end outside of the main chamber. On the outlet side it has a dimpled washer floating about, not sure what its purpose is. And on the inlet side a strange washer with four holes and a spud poking out each side. In the normal position the ball bearing pushes against it preventing it from sitting flush against the end of the chamber restricting flow. Now if the ball bearing is on its way to the other side of the unit the washer will be able to sit flush with the end plate and restrict the inlet side of the unit. Remember both have four small holes in them so its sort of a soft cut off before the ball bearing makes contact with the o-ring to completely seal the outlet. Perhaps the small amount of pressure that leaks past is used to force the ball bearing against the rubber seal.
The unit with the o-ring isnt actually an o-ring, its just a rubber seal held in place to expose an o-ring on the inside of the chamber, other than that it dosent actually do anything.
Also its worth keeping in mind if you have the right rear corner of the car jacked up its going to be very difficult to bleed that caliper as the valve is going to cut off flow, the car must be level. And if the left rear wheel is off the ground you will need to manually wedge the cut off valve open so it dosent restrict flow to the entire back axle. ...at least we learnt something useful out of this
There is a lot of bits inside but its fairly straight forward, with the unit tilted the ball bearing sits on a rubber o-ring completely sealing the outlet going to the caliper. In the normal position it rests against the metal end plate on the inlet side so its not completely sealed, and there are also four small holes on said end plate. Kind of makes sense as fluid will need to pass in that direction when you release the brake otherwise they would stick on.
The unusual bit is the washers on each end outside of the main chamber. On the outlet side it has a dimpled washer floating about, not sure what its purpose is. And on the inlet side a strange washer with four holes and a spud poking out each side. In the normal position the ball bearing pushes against it preventing it from sitting flush against the end of the chamber restricting flow. Now if the ball bearing is on its way to the other side of the unit the washer will be able to sit flush with the end plate and restrict the inlet side of the unit. Remember both have four small holes in them so its sort of a soft cut off before the ball bearing makes contact with the o-ring to completely seal the outlet. Perhaps the small amount of pressure that leaks past is used to force the ball bearing against the rubber seal.
The unit with the o-ring isnt actually an o-ring, its just a rubber seal held in place to expose an o-ring on the inside of the chamber, other than that it dosent actually do anything.
Also its worth keeping in mind if you have the right rear corner of the car jacked up its going to be very difficult to bleed that caliper as the valve is going to cut off flow, the car must be level. And if the left rear wheel is off the ground you will need to manually wedge the cut off valve open so it dosent restrict flow to the entire back axle. ...at least we learnt something useful out of this
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