pardon my really poor editing abilities.
read that number
looks like 3030 to me but it's hard to tell from the pic.

 

good eyes! it says 30/30. what application is this from or for?

 

I was just getting that part.

3030 - 9.5" front / drum rear
3035 - 9.5" front / larger drum rear
3040 - 9.5 front / disc rear
4040 - 10.25" front / disc rear
4035 - 10.25" front / larger drum rear
(there is also a 3540 that I've seen but I don't know what front brakes it had)


**edit**
oops, copied and pasted from another post I made a while back. removed the info that had nothing to do with you.

 

cxSHOE is the man for this question.

 

very good info! thanks a lot! i guess this 30/30 isnt worth anything.

 

A 3030 is the one everyone takes out when they do rear disks.

 

I pmed him, he'll followup.

 

Damn Relic, great info!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by litterbox &raquo;</TD></TR><TR><TD CLASS="quote">I pmed him, he'll followup. </TD></TR></TABLE>
ughh ohhh, now I'm in trouble.
Honestly I don't remember if I still have the first number and the second number switched or not.

but the 3030 and the 4040 is right for sure.

 

yea the 30/30 came on the cx models and the sort... useless valve if doing a rear disc brake swap. nice thats its an even number but you want to go bigger.

the si hatches 92-95 came with the 30/35 and it aswell is useless. when i switched to a 1" mc/booster combo i kept the stock 30/35 valve and tested the brake lock up in the rain ( works best since any amount of pressure will lock up your tires to see which is getting more pressure)

and i noticed that my rear tires locked up first with the 30/35 and the 1" setup.

and i switched the valve to a 40/40 and the fronts locked up first then the rears. which is what you want and which is normal.

so if your doing a brake swap you want the largest valve you can get so get the 40/40.

not sure if this helps. but either way go as big as you can.... i would also suggest going to a 1" mc/booster combo too.. way way more modulation on your brakes. the only thing you need to be careful is in the rain, you will lock those fronts up alot easier... but... you should be driving slower with 3-4 car gaps anyway...