I have a rear set of disk brakes that came off of a 90-93 integra. I was wanting to know if they would work on my EK coupe, or if i needed the 94 up ones. If so whats the difference? i read something about changing the proportioning valve,what is this and do i need to change it. Thanks for all the help.

90-01 Integras (except the Type-R) and 88-00 Civics with rear disc brakes are all interchangeable onto any EK, EG, ED, DA, and DC Chassis.

Check this link out for more info

Thanks for the help but have 2 last question (hopefully) Where is the Proportioning Valve located and will the 99-2000 si fit on my car without changing anything else.

the proportioning valve is located behind the Intake manifold. Looks like a spider in a way. 4 lines are going in one side and 2 out the other (can't miss it). Si proportioning valve fits an EK, no need to alter lines. They are the same casting