any bad things. rotor/pad wear, noise, deposits?
i'm speaking as a daily street driven pad. the friction seemed ok when cold.

Noise, dust, and more rotor wear. Other than that, not much.

And the fact that you will rear-end the car in front of you in an emergency stop, as these pads are very poor at stopping power when cold (i.e. when used as daily driver pads).

Think 90 year old blue haired lady driving a 1980s Buick reaction times for stopping your car in an emergency with these pads on the street. You don't want just "ok" for stopping power when it comes time to making an emergency stop, unless of course you own stock in a body shop.

benaj you have one of the closet list of cars that I would have if I had money:( :D :buttrock .

Rotors will last about 5k miles or something pathetic like that.

And the fact that you will rear-end the car in front of you in an emergency stop, as these pads are very poor at stopping power when cold (i.e. when used as daily driver pads).

Think 90 year old blue haired lady driving a 1980s Buick reaction times for stopping your car in an emergency with these pads on the street. You don't want just "ok" for stopping power when it comes time to making an emergency stop, unless of course you own stock in a body shop.

Have you guys actually tried driving with HT-10's on the street? I often leave the track pads in if I'm not going to drive my car much between events, and I've had NO issues with HT-10's, PF01's, or Cobalt Spec VR's driven on the street, other than noise, dust, and a bit more rotor wear. The rotor wear isn't even bad given limited driving. They will unbed the transfer layer at street temps, but it's not a big deal to rebed before an event.

Yes, the pads will not reach their maximum coeficient of friction at street temps, but a cold race pad (at least those in my experience) has at least as much stopping power as an agressive street pad.

I wouldn't recommend using a race pad on the street just because its a waste of money and the noise & dust aren't worth putting up with for no real improvement in braking (at street temps), but race pads are not in anyway dangerous to use on the street in my experience.

I agree with MCain here. I had 2 DE's about a month apart last year and never took the HT-10's out of my car for the time inbetween. I had no cold stopping issues and it was starting to get cold here in the midwest at that point too.

As everyone has stated rotor wear is increased and they are soo horribly noisy in my experience that you'll get stares...but no problems when it comes to performance, even cold.

Andy

Have you guys actually tried driving with HT-10's on the street? I often leave the track pads in if I'm not going to drive my car much between events, and I've had NO issues with HT-10's, PF01's, or Cobalt Spec VR's driven on the street, other than noise, dust, and a bit more rotor wear. The rotor wear isn't even bad given limited driving. They will unbed the transfer layer at street temps, but it's not a big deal to rebed before an event.

Yes, the pads will not reach their maximum coeficient of friction at street temps, but a cold race pad (at least those in my experience) has at least as much stopping power as an agressive street pad.

I wouldn't recommend using a race pad on the street just because its a waste of money and the noise & dust aren't worth putting up with for no real improvement in braking (at street temps), but race pads are not in anyway dangerous to use on the street in my experience.
exactly what i was looking for. while using ht-10's on my way to the track, i never once felt that my street braking ability was compromised. i just wanted to know the long term effects. thanks all.

i also agree. I used to drive the HT10 on the street long time ago, no ill effect.
With my new car, been driving on the street with the HT10 for the past 3 days, i love it. The 'only' possible issue is the very first braking you do, ie. maybe pulling out of the parking lot.

On the highway (i'm not using brakes at all) i had to do a somewhat hard stop, and boy did the car STOP hard, and i didnt even get into ABS.

Drawback...my wheels are BLACK after 1 day driving. good thing its not corrosive like the Blues. Its also NOISY as hell.

I think i'm gonna step down to the HP+ for street/autox and swap in the HT10 for track use.

I agree with almost everything said, the only time cold stopping can be an issue is a panic stop after driving down the highway for sometime, especially if you have brake ducts, otherwise they are fine "cold". As others have said, the dust is bad, they dust way more than when track driving, and they will squeal like crazy, you will get looks from people.

haha....especially looks from folks with their windows down at the stoplight...

i also agree. I used to drive the HT10 on the street long time ago, no ill effect.
With my new car, been driving on the street with the HT10 for the past 3 days, i love it. The 'only' possible issue is the very first braking you do, ie. maybe pulling out of the parking lot.

On the highway (i'm not using brakes at all) i had to do a somewhat hard stop, and boy did the car STOP hard, and i didnt even get into ABS.

Drawback...my wheels are BLACK after 1 day driving. good thing its not corrosive like the Blues. Its also NOISY as hell.

I think i'm gonna step down to the HP+ for street/autox and swap in the HT10 for track use.
i had hp+ and did not like them. great friction, corrosive dust, and noisier than ht-10. hp+ are the loudest pads i have heard.

I have a question for those who switch out the HT-10's for track days. Do you have to do any sort of rebedding for the pads before the track? I am using Axxis Ultimates on the street and was wondering what kind of bedding the Ht-10's will need when switching back and forth. They will be on the front only. Thanks.

I have a question for those who switch out the HT-10's for track days. Do you have to do any sort of rebedding for the pads before the track? I am using Axxis Ultimates on the street and was wondering what kind of bedding the Ht-10's will need when switching back and forth. They will be on the front only. Thanks.

I've had to with every pad I've tried combined with HT-10s (HP+ and Axxis Ultimates). If you don't rebed the HT-10s then you get the vibrations from hell on the steering wheel. Luckily the two events that I've done that with some numbnut has stuffed his car into a wall 5 minutes into the session so they bring us all in and wait for 10 minutes. Perfect bed in procedure, 1-2 laps on track, come in, cool off. Next time out the brakes are awesome.

-Carlos.

I have a question for those who switch out the HT-10's for track days. Do you have to do any sort of rebedding for the pads before the track? I am using Axxis Ultimates on the street and was wondering what kind of bedding the Ht-10's will need when switching back and forth. They will be on the front only. Thanks.
My usual procedure is to put the track pads in a few days before an event and drive around town normally. This will remove the transfer layer on the rotors left by the street pad. Then, the night before the event I bed the track pads by doing eight or ten decellerations from 80-10 mph. Do them back to back without letting the brakes cool. After that, try not to use the brakes, and let the car sit overnight (or cool to ambient temps).

Going back to street pads is similar, but I leave the track pads in for a few days to scrub off the transfer layer they put down, and you don't have to be as aggressive in bedding the street pads.

edit: Probably obvious and implied above, but you can use the track pads to clean the rotor's transfer layer by taking advantage of the pads more abrasive nature at street temps.

I sometimes enjoy the novelty of squealing race pads on the street.

I sometimes enjoy the novelty of squealing race pads on the street.


It sure produces some interesting, wide-eyed looks in the rear view mirrors of people you are behind.

Are the Ht 10 and ht 14 not corrosive? What about if the dust gets wet wheels? I just switched to 14/10 for this weekend.

HT10 dust is fine. Not sure about 14.

HT10 dust is fine. Not sure about 14.
The dust is pretty much the same between the two. Non corrosive, non etching, non caking. Just wipe up with soapy cloth occasionally and you will be fine.

And the fact that you will rear-end the car in front of you in an emergency stop, as these pads are very poor at stopping power when cold (i.e. when used as daily driver pads).

Think 90 year old blue haired lady driving a 1980s Buick reaction times for stopping your car in an emergency with these pads on the street. You don't want just "ok" for stopping power when it comes time to making an emergency stop, unless of course you own stock in a body shop.

I worry more about being rear-ended than rear ending someone.. I ran around with HT-10 for a short while until I have time to remove them. Almost got rear-ended once when I brake hard and fast..Street pads stopping power is quite similar to cold HT-10.

I worry more about being rear-ended than rear ending someone.. I ran around with HT-10 for a short while until I have time to remove them. Almost got rear-ended once when I brake hard and fast..Street pads stopping power is quite similar to cold HT-10.

In your situation, you most likely had not transferred your street pad film onto your rotors yet. Even Axis Ultimates suck a$$ as a street pad when they are first put on after track pads on a rotor. You need both abrasive *and* adherent friction for your brakes to work at their best. Brake pads on a rotor that has not been bedded-in to those pads will provide abrasive friction only. Some of us use this principle with cold track pads to clean our rotors. As you found out, using a street pad in this manor will provide you a rude awakening in an emergency stop situation-- as cold street pads provide very little abrasive friction and without bedding-in, almost no adherent friction.

Once again, Stoptech's white papers on their tech info page is an excellent resource for those wanting to learn more on this subject.

ben

I sometimes enjoy the novelty of squealing race pads on the street.
I'm with you Rob, everyone looks over...
"What's WRONG with that guy's car? I mean, he's driving a BMW! at LEAST he could fix his BRAKES! Geeeez!"

(I giggle)

What everyone else says. They stop hard on the street. Something I might have missed seeing, but while HT-10s wear like iron in a heavy usage track environment, I was burning through pads quick on the street when I left them on. That's a much bigger concern than reduced mileage for your rotors, given how expensive these pads are.

I don't know if my experience with the squeal was typical or not, but really, it's insanely loud. I don't just get looks from people on the street, but people in the paddock when I come squealing around. Maybe it's because I mostly run porsche events, and those guys always seem to have quiet brakes (which they need to slow way down with so my little e36 can blow by them, not to mention the dude in the spec miata...)

Funny, my track pads (SpecVRs) on my M3 are much quieter than my street pads on my C4S, which squeal like crazy on the street.