Got a track related question? I'll try to answer.

[Tokay444]

Originally Posted by dattran86

When im braking very hard from 150KM down to 100KM before the turn. my steering wheel would shake, the car feel off balance.

Is this normal under hard braking? or my tires are not good enough?

Please educate me if you know the problem.

You could have some uneven pad material build up on your rotors. That's the most likely cause anyway.

[dattran86]

Originally Posted by Tokay444

You could have some uneven pad material build up on your rotors. That's the most likely cause anyway.

currently running Hawk HP+. The first 3 track days with them, it was fine. after the 4-5 track day the problem started.

But i am getting new pads soon, i will see if the problem occur again

Thanks

[Tokay444]

It's likely not going to be the pads themselves.

[Icecreamtruk]

Originally Posted by dattran86

When im braking very hard from 150KM down to 100KM before the turn. my steering wheel would shake, the car feel off balance.

Is this normal under hard braking? or my tires are not good enough?

Please educate me if you know the problem.

The problem is hardly ever the pads. Check the rotors. Dont just check from 10 feet away and be like "they look good enough". Get really close and look at the surface where the pad is touching. You might see very small cracks on the rotor, these will get worse over time and eventually your brake pedal will start to pulsate and should you choose to keep running them they will crack completly.

If the rotors are fine, you might have an alignement issue. Toe-ou in the front will create that "unstable" feeling during hard braking. Have you checked your alignment lately?

[redlined600]

Originally Posted by dattran86

currently running Hawk HP+. The first 3 track days with them, it was fine. after the 4-5 track day the problem started.

But i am getting new pads soon, i will see if the problem occur again

Thanks

Probably a good time to upgrade. Do you set your parking brake in paddock?

[Lunatic]

Originally Posted by dattran86

currently running Hawk HP+. The first 3 track days with them, it was fine. after the 4-5 track day the problem started.

But i am getting new pads soon, i will see if the problem occur again

Thanks

I found the Hawk pads to be no good. After 7 or 8 laps on track they started fading. I switched to Powerstop Track Day pads. I'll test them out tomorrow. Got a track day at Willow Springs. Got some HPS 5.0 for sale cheap.

[dattran86]

Originally Posted by Icecreamtruk

The problem is hardly ever the pads. Check the rotors. Dont just check from 10 feet away and be like "they look good enough". Get really close and look at the surface where the pad is touching. You might see very small cracks on the rotor, these will get worse over time and eventually your brake pedal will start to pulsate and should you choose to keep running them they will crack completly.

If the rotors are fine, you might have an alignement issue. Toe-ou in the front will create that "unstable" feeling during hard braking. Have you checked your alignment lately?

I had the car up on jack stand and check the pads and rotor after the track day, rotor was fine but there was uneven wear from the brake pads.

I will do another double check when i get a chance on the weekend.

and I just got my alignment about 3 months ago when I installed my RCE Yellow, it should be 0 toe in front.


Thanks

[dattran86]

Originally Posted by redlined600

Probably a good time to upgrade. Do you set your parking brake in paddock?

nope, i put 2 piece of wood and try to back into the wood when i park in the pit. and put the car in gear

[dattran86]

Originally Posted by Lunatic

I found the Hawk pads to be no good. After 7 or 8 laps on track they started fading. I switched to Powerstop Track Day pads. I'll test them out tomorrow. Got a track day at Willow Springs. Got some HPS 5.0 for sale cheap.

thanks for the info,

And i can feel they starting to fade on the 5th track day.

Im looking into Project mu or Ferodo.

[Tokay444]

Originally Posted by redlined600

Probably a good time to upgrade. Do you set your parking brake in paddock?

Shouldn't matter. It's a drum/shoe setup.

[Tokay444]

Originally Posted by dattran86

I had the car up on jack stand and check the pads and rotor after the track day, rotor was fine but there was uneven wear from the brake pads.

I will do another double check when i get a chance on the weekend.

and I just got my alignment about 3 months ago when I installed my RCE Yellow, it should be 0 toe in front.


Thanks

Did you check the rotors for flatness with a dial indicator?

[dattran86]

Originally Posted by Tokay444

Did you check the rotors for flatness with a dial indicator?

Unfortunately no, do you think the rotor could be slightly warp?

[Tokay444]

Or it has uneven pad buildup on it.

[86league]

Originally Posted by dattran86

Unfortunately no, do you think the rotor could be slightly warp?

Originally Posted by Tokay444

Or it has uneven pad buildup on it.

I had pretty bad brake pulsation on my BRZ after several track days - I had read that warping was unlikely, it was much more likely uneven pad transfer. I took all the rotors off and sanded the he** out of them with garnet sandpaper such that there was no pad material on the rotors.

Pulsation still present.

Bought a runout gauge and found there was a fair amount of runout - can't remember the #'s, but it was out of spec - so either warped or thickness variation. I replaced the rotors and the pulsation went away, but came back after another 3 weekends. I've added some brake cooling to see if that keeps it from happening again.