Shuddering Under Brakes

[Minko]

Under heavy brakes to a stop(40->0) the front of my GTR feels crunchy as if something is going to snap

Normal 200->100KM hard braking feels fine. Obviously you dont usually brake hard to a stop but im paranoid

Anyone know what could be wrong here?

[tacker]

nothing normal about braking from 200km/h is this done on a track. Does it make the noise from 40> after pads are hot or only when cold. Also what pads are you running.

[INFRNT]

ROTORS MAY NEED MACHINING? FIREWALL FLEX?

[Proximity Motorsport]

ROTORS MAY NEED MACHINING? FIREWALL FLEX?

exactly wha i was thinking.

You have probably done a few too many 200km runs... heats ur rotors up... then they cool fast and the shape of the material warps .... u probably need to machine ur rotors. Try jack up your car and spin the tyre. U will hear it if its really warped.

[Minko]

By normal i mean most braking, rarely do you brake hard to a stop. Will check rotors tonight but havent noticed anything they are in immac condition & i allways cool it down etc. Does it both cold & hot brakes.

[petern]

I had this situation with my 1600, and because its got cross drilled and slotted disc I though they might be warped too.

I had a wheel alignment done and the shuddering under brakes stopped.

[DECIM8]

sand the pads and machine the discs I rekon.. uneven surface?

[GTS4WD]

Warped disks/pads

Braking from 200km/h places imence torture on disks and pads. What set up are you running?

You could of simply heated your brakes to a point where they warped.

Are any of the components new? Because they could be rooted from factory (happened to me before)

Do you leave your handbrake on after track meets? Because by doing so, you clamp your rears, they boil and cook. Not doin the funkey monkey!

[Minko]

Big Brembo's with DBA slotted rotors. Nope allways make sure handbrake is off & try to cool-down on last lap.

Not new but all the components are as-new condition, mechanic only just installed them 1-2 months ago & he would have pointed out any damage.

Could do with another allignment will see what its like after that.

[MrStabby]

Good luck with yours. I've changed rotors, got alignment, replaced bushes etc and it still shudders really badly on the track.

The next thing i'm going to try is pulling the rotors off and cleaning the mating surfaces so you could eat off them....if there's even the tiniest bit of crap it can cause a problem.