I've read a how-to, and talked to a person, that discribed a disc brake swap on a CRX. Neither mentioned replacing the stock proportioning valve or the master cylinder as a requirement.

When I put a disc brake setup on my Accord LX from an EX the guide I used stated it was nessesary to use the master cylinder from the EX because disc and drum require different operating pressures.

How can it be correct to run the stock proportioning valve/master cylinder for a Disc/Drum setup with a completely different Disc/Disc setup?

thanks,
rp

 

I know, i've never read anywhere that replacing the mastler cylinder was necessary for the rear brakes either. Here a good thread: https://www.honda-acura.net/forums/s...+brake+upgrade
It talks about front brake upgrading, but it does mention replacing the master cylinder as an OPTION, but not necessary to do so. Do some more research. I haven't looked too much into rear disc conversions, so replacing the master cylinder may be necessary. Hope this helps!

 

do not run the proportioning valve from a drum car to one with disc rears. You will be sorry when you spin out and hit a tree. Buddy of mine found out the hard way.

 

Dave that sucks, about your buddy meeting the tree.
Hope he was alright...

How do you know it was the conversion that did it, though? Maybe it was a little wet, or he was on shitty tires.... or just hauling too much ass.

That's not to discount your comment at all, I'm just looking for a possible explanation that so many people get away with not using a disc brake proportioning valve,
and so many FAQ's reccommend an action that obviously can be very dangerous.

 

rears locked up. He lost control. Bam! In that order.

 

I was told that you only have to swap out valves if you got bigger brakes.

 

This is for a drum to disc convert. Drums and disc brakes take different pressures.