no brake pedal feel

[JetDoc]

Ok here i go again working on these darn brakes! After replacing the master cylinder, front calipers, rear wheel cylinders all 4 hoses, and the brake booster i attempted to bleed the brakes AGAIN! i have good flow at all 4 corners, i bench bled the M/C, and bled the rest of the system as called out in the book, i checked the length of the booster rod and it's 10mm as called out for a 1978 280Z.... when i apply the brakes the rears will hold but the fronts will not. I removed and dissasembled the proportioning valve and found it all gunked up, (when removing the valve i only lost fluid from the rear brake lines, no fluid came out of the front lines). Now to my question (finally)! does anyone know of or heard of a kit to rebuild the prop. valve? A replacement from VB is $400.00 ouch!! Sorry to be so long winded but i figure more info is better than no info.!

[Daniel]

I think you gave all the info. required. NOT long winded. The prop. valve is just a ball and spring if I recall. I doubt thats it. You can buy them for about $10.00 or so from MP brakes I would think .It wont be datsun but they sell all the kits to update cars. I put disc front /valve and dual res master cylinder on my 46 chevy truck. As for your trouble make sure all your bleed valves are on the top not bottom position. Since the air rises you will never bleed it out if you swapped L and R fronts or installed rear wheel cyl. upside down.