i put rear discs on my 96 lx (has ex front brakes), today when there was some fresh snow and i hung out the window and slammed on the brakes i noticed only the front tires locked up

when i bled them both sides pushed fluid and later i had someone step on the brakes and both rear wheels seemed locked up when i tried to turn them by hand but im no chuck norris. . also noticed my new rear rotors still look very new like they havent seen much friction


im using the stock civic lx prop valve and lines, ex front brakes, integra rear

 

I believe you have to change the prop valve to a 40/40 from a teg without ABS. Maybe even change to a 1" MC.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by uneek360 &raquo;</TD></TR><TR><TD CLASS="quote">I believe you have to change the prop valve to a 40/40 from a teg without ABS. Maybe even change to a 1" MC.</TD></TR></TABLE>

It is suggested that you do this and it will help, but even so, your front brakes do most of the braking.

-Shane

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nighttrain33 &raquo;</TD></TR><TR><TD CLASS="quote">

It is suggested that you do this and it will help, but even so, your front brakes do most of the braking.

-Shane</TD></TR></TABLE>

I agree. You definately don't want both brakes to totally lock up as that can lead to uncontrollable sliding.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by uneek360 &raquo;</TD></TR><TR><TD CLASS="quote">I believe you have to change the prop valve to a 40/40 from a teg without ABS. Maybe even change to a 1" MC.
</TD></TR></TABLE>

yea do both of these. I'm guessing since you upgraded to both front and rear brakes there isn't enough pressure build up. I'm not sure what the difference between the ex booster/mc and the lx booster/mc though. If they are different then a teg mc and 40/40 prop vavle should do the trick.

 

i was told that the EX was the only one with the 40/40 valve. i too just put disks on the rear and feel that somthing is not right.

bump for more info

 

actually i think the EX with drums has 30/30... not sure.

 

I personally do not think the prop valve is your problem. The DX and Si(EM1) share the same prop valve and the DX did not come with rear disc brakes as opposed to the Si (EM1). I have done this swap twice in 2 different cars and have had no problems, even when slamming on brakes.

What MC and BB are you using?

 

Taken from this thread: https://honda-tech.com/zerothread?id=641639

On to the master cylinders. You poor guys with 92-95's are on your own here I only mess with 96-00 civics myself as I like them more and I highly suggest if you convert a 96-00 civic to rear discs that you use 99-00 Si master cylinder and proportioning valve. If you have a 96-98 EX you do NOT have to upgrade your master cylinder as it is the same as the Si but you WILL have to upgrade the proportioning valve as that is where the different valving comes into play (96-00 Dx, Hx, Lx should change both). This is necessary as drums use higher line pressure due to the curved and lengthened surface of the pads needing more pressure to get the same clamping force (though they can be adjusted for zero drag...but that's on a completely different subject all together). If you continue to use your drum setup proportioning valve the higher line pressure (even without pedal pressure) will not allow the pads to release completely and you will risk either one or a combination of the following problems unless your car is a freak of nature:

1. overheating and warping the rotors
2. car will grab more on one side and you'll travel that way instead of tracking right and will forever think your alignment is out
3. overheat and bind the caliper (I had this happen back in the day...not fun)
4. burn down the rear pads fast...you'll know when you have twice as much brake dust out back than up front.

 

i forgot to to add i DO have the EX 7/8 MC

so i do or do not need the SI prop valve? cause i keep hearing its the same and then not.. is it bolt it no changing lines?

 

I can tell you from experience, and you can check with Honda, that the DX and Si prop valve is exactly the same!

 

ok well i think my calipers are just **** then in the back, im pretty sure on snowy icy road all 4 of my wheels should lock up

 

you need the prop valve if you had drums orginally.

you will never "lock" your rears, if you did you car would be very unstable during braking.

 

wtf

 

Did your LX come with ABS?

 

no

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by instrument &raquo;</TD></TR><TR><TD CLASS="quote">you need the prop valve if you had drums orginally.

you will never "lock" your rears, if you did you car would be very unstable during braking.

</TD></TR></TABLE>not even on ice with no abs ?