trying to locate exact location of gja8976aa non return valve on my 2002 car
any help please.

 

Hi Dennis,
Have a look under the scuttle in front of the drivers side. Lift out the panel over the brake servo and look above and behind that. From memory, it is incorporated into a plastic 90 degree joint in the hose. I had to clear mine out recently, as it had blocked and I wasn't getting any juice on the drivers side of the screen.
Hope this helps,
Andy.

 

I recently replaced mine along with the tubing and posted photos of the parts

 

Item 19 in the diagram:


(click on the image to enlarge it)

Graham