customblackbird

iTrader: (15)

just found out that one of my brand new summit extreme diamond grooved/slotted rotors is warped. this was from an accident where the front rim was destroyed and spindal damage. now the rotors only have 800miles on them and i would be really annoyed if i have to replace both rotors bc of this. summit doesnt sell the rotors seperatly sooo can i run a crossdrilled/slotted rotor on the pass side(warped rotor side) and the diamond grooved and slotted rotor on the driver side?

i would usually just replace them both but this is different bc money is tight and the rotors are basically new.

yes or no?

Stephen

iTrader: (12)

Have you asked Summit if you can get just one, and explained why?

They might if you called & asked, just not normally sell them individually.

Just a thought.....

NINÅ

No problem running different rotors left to right or front to back.

Especially for normal driving, you’ll never notice.

And if you’re a performance driver you can feel impending lockup of the first wheel anyway.

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Happy Racing!

customblackbird

iTrader: (15)

thanks guys i figured it wouldnt matter but i also here u should never replace one rotor at a time and that both should be done in pairs, in the front and back.

i called summit, awsome customer service... i was past the 1 yr warrenty by 5 months and they did me a favor by replacing the rotors for free, i just needed to pay the shipping to ship my rotors too them.

is there a problem running larger brakes in the rear compared to the front? example
heres my brake setup

FRONT
10.5" rotors up front
SSBC force 10 aluminum twin piston calipers
Power stop ceramic pads
no proportioning valve, front brakes run off a TEE from the master cylinder.

REAR
Stock ford 8.8 11.5" rear disks
stock iron single piston calipers
rear uses a SSBC proportioning valve off the master cylinder
stock organic pads (ceramic would chew into the rotors too fast)

do i have to worry about braking issues with my rear rotors being larger than the fronts?

Stephen

iTrader: (12)

A simple would shown you my thread about that....
https://www.thirdgen.org/forums/brak...akes-than.html

It's even still on the 1st page on the Brake Board.

Guest

If the surface area of the rotors is different (ie:a cross drilled vs a non cross drilled) then the car will pull to one side under braking. If there is a significant enough difference in the two rotors you're going to use, you may get a pull to one side or the other.

customblackbird

iTrader: (15)

i dnt like to read your threads stephen... lol jk.

madmax, your saying that 2 rotors, both are slotted but one is cross drilled and the other is diamond grooved (not cross drilled but has grooves in the rotor like lil diamond grooves) that the car will pull to one side? due to wat? since both would have essentially the same surface area due to the cross drilled holes and diamond grooves. is it something about the holes allowing the gas to escape so you dnt get gassing where the pad doesnt contact the rotor fast enough bc of the gas that is produced (pad riding on cushion of air before making pad contact). the cross drilled holes would allow the gas to escape but would the diamond grooves do it too?

Stephen

iTrader: (12)

Oh well.....Find your answers on your own then! ;P

Guest

I dont know anything about either of the two rotors you are talking about, so I cant say what it will do using those two rotors. What I can tell you for certain is if the surface area that the pad rides on is different from one side to the other (as I said before, if you have one drilled and one original factory undrilled rotor) then it will pull to one side when braking. It doesnt have a thing to do with all the gases/air/etc talk it has to do with how much area of the pad is contacting how much area of the rotor. Less area on the rotor=less area for friction=less braking power=pull to one side.

Stephen

iTrader: (12)

Then that would mean that max area = max braking.

Which would mean that cross drilled = less area = less braking force.

Which means cross drilled rotors = less effective than stock, solid surface rotors.

Which means stock brakes are better & that "braking gas" has no affect.......

And that is wrong.

customblackbird

iTrader: (15)

point im saying is that 2 rotors one cross drilled and one that is diamond grooved have the same surface area. since the pad doesnt contact the holes or the groove they act the same. im not talking about a factory solid surface rotor im talking about these.

http://www.summitracing.com/parts/SUM-DSEP-5547L/
and
http://www.summitracing.com/parts/SUM-AR8213PS/

i read somewhere that the slotting/cross drilling etc to a rotor doesnt affect brake surface area.

Guest

So you're saying a cross drilled rotor will have the same braking force as one that is not? I sure hope not, because that is not true.

Stephen

iTrader: (12)

No.

According to YOUR words....YOU are saying that cross drilled & slotted rotors provide less braking than solid rotors.

Guest

And your point is?

Stephen

iTrader: (12)

I already posted why above...Re-read it.

JamesC

iTrader: (5)

Baiting is against TGO rules. Clean the remarks up or I'll close/edit the thread.

JamesC

Guest

No, as usual, you are. You really need to stop attempting to refute things you have no knowledge about. Someone who knows how brakes work would not ask if running larger rear brakes would make their car unsafe. They'd figure it out on their own.

I already knew before I did an experiment what the results would be, but verified experimentally anyway a little over 8 years ago. You can do a search on this website (madmax and cross drilled) and find that information I posted in 2002 that says if you run a rotor with less surface area contacting the pad the car will pull. That is just a fact of friction and physics.

Stephen

iTrader: (12)

I don't need to read (or care) what your home experiments showed YOU.

Many posted their own results & none were bad. Your the only one who thinks they are bad, so maybe your test was in error?

You totally discounted outgassing, which is also a fact in some pad compounds, which limits their effectiveness, regardless of diameter.