Self made cross-drilled/slotted rotor (Yes or No)?

[Veloc]

Dear forumers and sifus here,

Just want to ask on this matter. I'm hoping for soem good advice and opinions especially from those who have done cross-drilled/slotted rotor in a machine/engineering shop. This happens to be the trend as it is cheap and looks cool.

1. Does it have any benefit in daily drive/track?
2. Does it have any bad effects such as reliability issues?

 

[xtremeleo]

i dont suggest a diy cross-drilled discs, get a set dat originally design with drilled slots in them

 

[ken yeang]

Too risky, bro.

Ask yourself this....

if discs are so easily drilled and made based on standard OEM disc, then hi-performance brake manufacturers can close shop liow.

Buy reputable drilled/slotted discs.

 

[BoxCarRacer]

I did a cross-drilled on my stock disc before and it was alright for the first month until one day, I had to do an emergency braking and from there onwards, there has been scratching sound everytime I press the brake. After inspecting it, turns out the was a hair line crack on the holes that were drilled and end up me buying another set of aftermarket dics (proper one of course).

I met couple of privateer racers claim that its the cheapest method in enhancing their car stopping power but they sent it to a reputable engineering shop to do it for them.

By the way, aftermarket performance disc are way thicker than your stock and treated to withstand heavy abuse from your right leg

As for my opinion, save some money and buy a proper disc which ensure quality and most important of all, SAFETY!

 

[^pomen_GTR^]

just make sure the engineering shop who did it make proper measurement and equal drilling on both disc....no problem if done correctly....

 

[DanzEterna]

I did a cross-drilled on my stock disc before and it was alright for the first month until one day, I had to do an emergency braking and from there onwards, there has been scratching sound everytime I press the brake. After inspecting it, turns out the was a hair line crack on the holes that were drilled and end up me buying another set of aftermarket dics (proper one of course).

I met couple of privateer racers claim that its the cheapest method in enhancing their car stopping power but they sent it to a reputable engineering shop to do it for them.

By the way, aftermarket performance disc are way thicker than your stock and treated to withstand heavy abuse from your right leg

As for my opinion, save some money and buy a proper disc which ensure quality and most important of all, SAFETY!

yes its true...i also cross drilled my discs....after a while a hairline crack will appear......i also dont recomend to do it.

 

[neohadri]

i will avoid drilled rotor, slotted is enuf already, tbh i prefer blank rotor because it has more surface area, but since i'm running on 800° pads, i have to use slotted rotor so it will help to get the pads up to temperature faster

 

[Veloc]

What? LOL... Suddenly jadi poll pulak...
Thanks for your feedback guys... Now I think I better not do it. Better save up and get new rotors next time.

 

[K_Takuya]

Its an avoidable risk... don't do it..

 

[MKMD428]

cross drilled rotors cool down fast. DIY on OEM? possibilities for hair line crack? 100% confirm. I've seen 2 pots, 4 pots, even a floated disc that was DIY cross drilled, eventually ended up with hair line crack.

slotted i guess its just for the sake of having a clean and shiny rotors?

 

[ken yeang]

new replacement brake discs are quite affordable these days. There are many manufacturer out there.

 

[Veloc]

Hmm... So far, mostly negative comments on cross-drilled. How about slotted? Any problems?

 

[MKMD428]

slotted for me, no problem. been using it. happily. R32 Gtt rotors.

 

[tofu_manic]

neat write-up:

Brakeoverstock - Tech Article 1

 

[loose_end]

They does it for the look.

 

[khellvinne]

Okay, then i think i slot my rear disc and change a real cross drill at front disc. ^^

 

[nappx]

Veloc i got aftermarket slotted used disc with 500 cc endless brake pad...

 

[sky_vspec]

Having experience myself on DIY slotted disc and high performance brake pad on my previous car, I can say it is worth the money.

On my current car, I swap the stocks with some branded cross drilled disc and pad and also it worth the money.

Given any circumstances, they do provide me the bite that I need.

As long as you get yours done with a machine shop that really knows what they're doing (calculating the degree of angles and stuff), you are good to go.

Hairline cracks are common for cross drilled disc, especially when you're pushing the limits. Even stock OEM GT-R disc will suffer from cracks after quite sometime, especially for those track day enthusiast.

 

[l2s_turbo]

My point of view is that slotted is ok to DIY as i've used them on both of my cars.. so far they serve me well apart from some noise being generated when during harsh braking (it's actually the sound of the slot CUTTING your brake pads thus makes your brake pads wear faster, haha), overall braking was improved...I personally don't recommend cross drill on stock rotor.. because it'll cause hairline cracks on those rotor in the later stage.. unless it is bought in that way eg like Brembo's cross drilled rotor.. their are cast in that way that comes with the holes in order for cooling purposes.. you can see it from the side of the rotor.. the holes sometimes are like a tube inside.. that's why it wont crack so easily.. as bro sky_vspec mentioned also correct, OEM GT-R35 rotor was also cross drilled but it is not actually came stock from the cast itself, it was "re-drilled" after that.. thus it'll cause hairline cracks when hard braking and tracking.. i personally saw one of the R35 in singapore that have this problem, and the mechanic told me the root of this problem.. and the owner had bought new Dixcel slotted rotors to replace it all round which cost SGD1200 per pc.. lol..