Is someone around here braking with the Viper caliper kit?

[COKE]

I would like to know if someone around here is braking with the ARengineering viper calipers&11.75 rotors kit.
I have some doubts with the Master cilinder size.
Arengineering suggest the 1 1/32" bore Mopar aluminium master cilinder,but i belive  maybe it would go better with a smaller bore.
Mine has it with manual set up,and it does brake,but i belive that it should to brake more.
2.5 newtons on the brake meter,wich is fine. But my friend´s 70´Mustang with the original cast iron MC and SSBC calipers, does make 4 newtons on the brake meter machine !Also  with manual brakes.
Maybe a 15/16" or 1" would be better for this set up.
All the opinions are interesting for me.
Thanks.

[Steve P.]

Do you feel it takes too much leg to stop your car?? 

[andyf]

The 15/16 MC is a good size but the problem is that those master cylinders no longer are machined for the brake rod retention o-ring.  The other thing is that those MC's are the tilted style so you have to swap the reserviors on them.

You can swap the reservoir and then have the rear piston machined on a lathe for the brake rod o-ring but that is a bunch of trouble.  If anyone has a better solution I'm all ears.  Maybe the Wilwood master cylinder would be worth a try?

[COKE]

I feel the Brakes are  a little hard  for the how it brakes.I belive that with those calipers and rotors it should to brake more.

Would not this part work with the  manual  Push rod?

http://store.summitracing.com/partdetail.asp?autofilter=1&part=DCC%2D5249270&N=700+115&autoview=sku

As far as i know the one and only diference between this part (5249270) and the one i have (5249271) is the bore diameter.

In the summit catalog says:
"Upgrading your brakes? While you´re at it,drop in a mopar performance master cilinder assembly.Choose the 15/16" bore diameter kit for a maximun fluid displacement and pressure,or pick the larger 1 1/32 " diameter bore kit for increased pedal feel."


That,s why i was thinking maybe it would go better with the 15/16.
Mine gets a fulid pressure of 1500 psi on the fron caliper.If you get more pressure with a smaller mc bore,may be it would brake better.

However it is only a question.You designed the kit so i suppouse youhave  know it better than anyone.

[andyf]

The 15/16 bore size will increase the line pressure and will decrease the pedal pressure but you'll need more pedal travel.  That is all fine and good, the problem is the issue with the brake rod retention o-ring as I said in my earlier post.

[Steve P.]

I have driven many simple conversion cars with (Volare', Aspen, Fifth Avenue, Diplomat), brakes. They are cheep to find and convert and I have yet to feel one that I would say is hard to stop at any speed. Not too much pedal, (leg), needed. No control issues. Of course bigger rotors and calipers are going to stop the car better. Drilling the rotors will help with braking also..  BUT, I can tell you with experience that stopping a 4000 pound Charger after a 120 mile per hour blast is no problem at all.  Brakes like Andy's will do it with a shorter distance and definitely better looks.

So in my opinion,, if you think it takes too much leg to stop your car with this simple conversion you:

A) Have another problem with the brakes.

B) Are a silver spoon type that has others do even the simple things.

C) Are a girly girl that needs to do a bit of exercise.

D) All of the above.

I am kidding you of course, but, really there is no more you need than the later model factory stuff...

[COKE]

The 15/16 bore size will increase the line pressure and will decrease the pedal pressure but you'll need more pedal travel. That is all fine and good, the problem is the issue with the brake rod retention o-ring as I said in my earlier post.

That is a good explanation. 
What about the original Manual  disc brake master cilinders?

Steve P,
I only asked why not a smaller bore if it gets more pressure.
In any moment i said that the car does not brake or that  the Andy´s kit does not work.

[andyf]

An original manual disc brake MC might work but I think they were usually the larger size.

I believe what happened is that Mopar Performance changed suppliers sometime over the last several years and the 15/16 MC that used to work with the manual pushrod got replaced with a power brake unit.  But they aren't that expensive to purchase so maybe just buy one and then modify the rear piston if you have to in order to get the pushrod retainer to fit on there.  Or fabricate some other type of pushrod retention device.  You can also call GregZ at www.magnumhp.com to see if he has a small piston MC for you.  He might have a solution.

I have the 15/16 MC on my car and it works great with the Viper calipers.  But my MC is about 10 years old and it has the pushrod retention feature.

[Steve P.]

I understand, Coke. I get it that you want to tweak the system. I'm just saying that from my experience it really isn't necessary. Just my opinion...