Brake Pedal Ratio

[8upZR1]

Does anyone know what the brake pedal ratio is for our cars?

[flyin ryan]

no. never spent much time thinking about it on these cars. not hard to figure out though. what are you up to? going manual?

[8upZR1]

Yeah, I got a manual M.C. for my new brakes. I think its actually from a Mopar, but it has the correct bore diameter so Im going with it.

[flyin ryan]

ya, well then, whatever the ratio is now your going to need more. what i'll do in that situation is mock everything up, bottom out the M/C (with out fluid) push the pedal all the way to the floor then back it up a hair, inch, then figure out your pushrod & pedal ratio, follow me? i see tons of guys try to do this, then they cry the new brakes they put on aren't very good? 99% of the time they're not getting anywhere close to the full stroke out of the M/C. on my Stingray, probably has a similar M/C as your talking about 1.125" bore Mopar aluminum body plastic tank, i'm never able to go to the "floor" even in an emergency situation. that's because i've made sure i'm using up all of the availible stroke before i get there. my Stingray runs 151 MPH in the ¼ mile w/o a parachute so i want to make sure i'm able to pull her down. a little off topic & maybe your a brake engineer for all i know but i thought this might be helpful to somebody.

[8upZR1]

I think I have that exact Master Cylinder. Its a nice piece but the fittings are hard to find as 1 of the 2 is a strange size. I wanted to convert to AN hose and havent been able to locate the appropriate inverse flare to AN deal. Its like 9/16th but the threads are right in between coarse and fine.

It will all be worth it in the end. Its important to get the pedal ratio at least close. The situation you mention, pedal to the floor, is definetley to be avoided. As I get older and more knowledgeable I am getting more and more into safety epuipment like brakes. Its nice to know they will work when needed.

[flyin ryan]

Originally Posted by 8upZR1

I think I have that exact Master Cylinder. Its a nice piece but the fittings are hard to find as 1 of the 2 is a strange size. I wanted to convert to AN hose and havent been able to locate the appropriate inverse flare to AN deal. Its like 9/16th but the threads are right in between coarse and fine.

It will all be worth it in the end. Its important to get the pedal ratio at least close. The situation you mention, pedal to the floor, is definetley to be avoided. As I get older and more knowledgeable I am getting more and more into safety epuipment like brakes. Its nice to know they will work when needed.

i converted mine to -3 AN. it's the ONLY way to go. it was a while ago so i'm not going to pretend to remember what that odd-ball size is. try Lamb Components in Upland CA. 909-985-1901, www.LambComponents.com. you might have to ask for Betty if your not getting anywhere.

[8upZR1]

Thanks for the #. Ill give them a try. I have searched high and low and have found nothing. Its a 9/16-20. Ive found 9/16-18 and 9/16-24 fittings but no 20. I totally agree on going the -3 AN route. It just makes life so much easier and nicer. My neighbor ditched all his oem rubber & hard lines for SS/teflon -3 AN on his 911 turbo and he says he couldnt be happier. I just hate dealing with flare/inverted flare and compression fittings. AN makes life good.