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Proporsioning valve and brake system question


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On my 280z, the brakes were troublesome and lines were leaking so I tossed the whole thing. I plan on the Toyota four piston front and 280zx rear disk. I have a few questions.

Were the 82-83 280zx the only years with rear disk or is there another reason no one uses other year calipers in the swap?

I also threw away the 4 fitting square master cylinder looking piece that the brake lines connected to after the master cylinder. Was this the proportioning valve? I assume it dealt with fluid distribution from front to rear...

Anyone running this brake setup with a stock proportioning valve? Is the 280ZX valve better then the S30's?

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