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66fastback · 11-05-2000, 08:32 PM

I'll agree with Rev on this one. The reason for needing a proportioning valve is the large difference in fluid needed to move the pistons. Disc brakes require a lot more fluid movement to move the caliper piston(s). The smaller brake cylinders on drums actuate with a lot less fluid. So when you have a disc/drum setup, you need the proportioning valve.

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66 GT Fastback 5.0, 5-speed, cable clutch, JBA's, 3.40 gears, EFI coming soon?

11-05-2000, 08:32 PM	#4
66fastback Registered Member Join Date: Mar 1999 Location: Dallas, TX Posts: 208	I'll agree with Rev on this one. The reason for needing a proportioning valve is the large difference in fluid needed to move the pistons. Disc brakes require a lot more fluid movement to move the caliper piston(s). The smaller brake cylinders on drums actuate with a lot less fluid. So when you have a disc/drum setup, you need the proportioning valve. ------------------ 66 GT Fastback 5.0, 5-speed, cable clutch, JBA's, 3.40 gears, EFI coming soon?