Hello guys,

I have some brake issues and I have a trackday comming, so this issue needs to be sorted now else i can't take this car.

I have rear brake upgraded to disks, the cosworth onces. As rears locked i bought an eBay proportional brake valve for the rear. I followed instructions of a dutch Guy and fitted it like this:

4 outs, two front, two rear, on master
Front two go to left and right front brakes
One back on master is blocked off and other back goes as single line away from the master cyl. Then the proportional valve is fitted. Out from PV to the back. T-piece and to the brakes.

First it seems to work. Later started locking. Didn't react as expected on adjustments, so contacted the company. Reaction it might be broken we send a new. New fitted exact same issue. The eBay company has good feedback and start to doubt my set up.

Did i do the mounting on the master wrong? Is the pressure out of the master equal on all 4. Do i create a problem by blocking one?

Any feedback would be highly appriciated!