Brake Piston Size

[FlatTire]

I am going to buy some new rear brake calipers(Forged Superlites) and wasn't sure what size of piston I should go with for the rear. I run 1.25" rotors and the front master cylinder is 1" and rear is 7/8". I race on a 1/2mile that stays heavy most of the time and I find that I use a lot of rear brake. I have a tendency to drive it in harder and deeper than most! (that's how my women like it too).

Currently the car has the following for brake piston sizes:
LF-1.75
RF-1.75
LR-1.38
RR-1.75

I wouldn't mind a little more rear braking force. You guys got any ideas you care to share?

[Jim11h]

I am going to buy some new rear brake calipers(Forged Superlites) and wasn't sure what size of piston I should go with for the rear. I run 1.25" rotors and the front master cylinder is 1" and rear is 7/8". I race on a 1/2mile that stays heavy most of the time and I find that I use a lot of rear brake. I have a tendency to drive it in harder and deeper than most! (that's how my women like it too).

Currently the car has the following for brake piston sizes:
LF-1.75
RF-1.75
LR-1.38
RR-1.75

I wouldn't mind a little more rear braking force. You guys got any ideas you care to share?

i always ran the smaller one on RF so i could lightly scrub brake and get more braking effect in rears and on LF to turn car down into corner.

[billetbirdcage]

I am going to buy some new rear brake calipers(Forged Superlites) and wasn't sure what size of piston I should go with for the rear. I run 1.25" rotors and the front master cylinder is 1" and rear is 7/8". I race on a 1/2mile that stays heavy most of the time and I find that I use a lot of rear brake. I have a tendency to drive it in harder and deeper than most! (that's how my women like it too).

Currently the car has the following for brake piston sizes:
LF-1.75
RF-1.75
LR-1.38
RR-1.75

I wouldn't mind a little more rear braking force. You guys got any ideas you care to share?


As long as the brakes are clamped to the axle the LR is doing the same thing as the RR and not really loading or unloading it perticular wheel differently like a floated brake would so I see no reason to run a differrent LR one the RR. I'd use the bigger ones on the both rears if you after more rear brake.

Maybe the smaller one on the RF if you wanted more turning effect under braking like Jim said.

If you really want more rear go to a set of billet calipers instead of forged.

[FlatTire]

Yeah I wondered why the smaller caliper was on the RR, thanks for clarifying that. It's always been that way since I bought it used.

So what is it about these billet calipers that create more stopping power?

[2dumb2kwit]

So what is it about these billet calipers that create more stopping power?

I may just be confused again, but I'm thinking less flex.

[bizkit]

DO brake caipers flex? or is it expansion with heat?

[2dumb2kwit]

DO brake caipers flex? or is it expansion with heat?

I was thinking flex alot more so than heat expansion, but thats a guess on my part,......I have no facts to back up what I'm thinking.

[bizkit]

Billet calipers, are closer toleranced than a cast caliper, and it will also disapate heat much better. If your running cast calipers still, upgrade and you want believe the difference....
Flex...bro I can't seem to get my head wrapped around what your getting at? A cast part want flex, it will crack and brake.

[2dumb2kwit]

I'm probably way off on this one. You know I get confused easy!!! LOL

[2dumb2kwit]

Check this out.
http://www.outlawbrakes.com/4000.html

I'm not saying it's right, just giving an example of where I may have gotten the thought in my head! LOL

[bizkit]

I should've phrased my comments as questions....I wasn't able to look at that link, because of the filter here at work

[2dumb2kwit]

Outlaw 3000/4000 Features
• Billet Aluminum housing design. (Superior in strength to cast calipers).
• Six bolt, multi-ribbed housing. (Increases rigidity and reduces deflection for improved pedal feel).
• Dual center bridge bolts. (Reduce caliper flex).
• Open bridge design. (Reduces conductive heating of caliper by directing heat out through the caliper housing).
• Stainless steel pistons. (Retard heat transfer to brake fluid). Titanium optional.
• Differential size piston bores. (Eliminates excessive pad taper).
• Pad abutement plates. (Eliminates pad dig-in).
• High Temperature, square cut piston seals. (Controls piston retraction for zero drag).
• Insulated Stainless steel crossover tube.
• Standard 3.5" mounting pattern.
• Can be used with fluid recirculating systems.


Here ya go, big guy. I wouldn't copy this for just anybody! LOL

[bizkit]

Outlaw 3000/4000 Features
• Billet Aluminum housing design. (Superior in strength to cast calipers).
• Six bolt, multi-ribbed housing. (Increases rigidity and reduces deflection for improved pedal feel).
•[bold] Dual center bridge bolts. (Reduce caliper flex). [\bold]
• Open bridge design. (Reduces conductive heating of caliper by directing heat out through the caliper housing).

Here ya go, big guy. I wouldn't copy this for just anybody! LOL

Not sure what there meaning, unless there saying that keeps the pad from riding up off the rotor?

[IDOXLR8]

R2D2, the big guy stuff is scareing me.:shock:

[2dumb2kwit]

R2D2, the big guy stuff is scareing me.:shock:

Don't be,....I was just being nice,....He gets mad if you call him pee wee! LOL

(R2D2, dang, I don't get no respect!) LMAO

[bizkit]

R2D2....now that's sum funny chit

[billetbirdcage]

My thought is most of the additional braking power comes from the increased stiffness of the billet verses the casting. Cast will flex alot more then a billet casting due to the density of the material, which causes less pedal stiffness and reduced pressure at the pad.

IMO!

I can tell you that between a cast dyna-lite and a billet dyna-lite there is NO comparison. The billet dyna-lite will brake about as good as a cast Super-lite.

[2dumb2kwit]

My thought is most of the additional braking power comes from the increased stiffness of the billet verses the casting. Cast will flex alot more then a billet casting due to the density of the material, which causes less pedal stiffness and reduced pressure at the pad.

IMO!

Holy crap!
Did my thinking just get the "Big Bird" stamp of approval? LOL