I recently did the rear disc conversion and I was just wondering if there is a difference between the 97 civic proportion valve and oo civic si. And also if there is an alternative besides the si one?

 

what trim level is your civic?

 

I have a 97 civic ex

 

If you call Honda they have the same part number for the si and rear drum brake cars so I'm pretty sure all the 96-00 are the same

 

the reason I ask is because I read from a forum that you need to upgrade the proportion valve also so I went ahead and did some research and to me its basically the same part

 

+1 from all the hype ive read some were saying just the hatches had the same but more and more say the dx having smaller front brakes allow for more flow to go to the rear . they are the same 96-00.

 

so why is the brake pedal not stiff?

 

the pedal has nothing to do with the proportioning valve.

 

I went to a 1 inch master cylinder if you use the stock it will be mushy.also if you have a lot of moisture in your brake fluid it gets like that there is actually a life span on brake fluid

 

before I upgraded the rear brake, everything was fine but now the brake pedal is too soft.

 

Then bleed them more and flush your brake sYstem

 

you have air in the lines.

 

alright thanks. I'll keep you guys posted

 

you do know that upgrading to a 1" master is decreasing Clamping pressure....7/8" is perfect for our cars. here is an instance that bigger isnt always better... no pun intended

 

They look the same externally, it's the valving inside that's different.

The EX prop valve is different. CX, DX hatch, DX, HX and Si coupe all share the same (Si) prop valve. Everything else is different. The prop valve doesn't really have anything to do with rear discs vs drums, it has to do with brake bias.