View Full Version : drum to disc?
05-15-2008, 11:28 AM
Is there any reason that one would have to replace the master cylinder when switching from drum to a rear disc brake set-up?
05-15-2008, 11:37 AM
master cyl I dont think so... proportionning valve definitely.
05-15-2008, 01:06 PM
i didnt put a proportioning valve on mine and its fine.
05-15-2008, 01:10 PM
Did the swap in '98 , used the ZX2 brake system with the EGT rear disc , work excellent no problems .
05-15-2008, 01:47 PM
It is not needed. Yeah the proportioning valve is different, but it won't make that big of a difference. So IMO just hook em up.
And if JohnP says so, it's true.... Take that to the bank!!
05-15-2008, 03:44 PM
I thought so. I guy at the yard where I'm pulling the rear disc's told me that. I told him that it wasn't necessary, but I wanted to check with you people just to make sure. Thanks.
05-17-2008, 07:00 AM
yeah it will definitely work, but on a stock ZX2, braking is 80% in the front and 20% in the back (with drums)... if you install discs without the proportionning valve, it will be 20% braking power on you rear discs. If you do change it. it will become 60-40 (or 70-30 im not sure)
05-17-2008, 04:52 PM
I can't see it working right without the right proportioning valve. The drum brake system has a check valve in it to keep 2-3 pounds of hydraulic pressure. This will cause drag with discs - they don't have return springs like drums to counteract this.
But it seems the master cylinder is just fine either way.
05-17-2008, 07:32 PM
Never any problems , the pads don't drag , excellent braking .
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