DansBlkonBlkZ06

I tried the ST47 pad for the first time at VIR this past weekend. I run Wilwood SL-6 calipers with Wilwood 2 piece rotors and had a hard time from keeping them from locking up in the hard braking zones. The ABS would kick in immediately after the tires would bark. I had to threshold brake all weekend to keep from flat spotting the tires.
Has anyone tried this pad? I used the ST43 last year with much success, but I think the 47 might be too much initial grip.

k24556

I have st-47's on my c5 (stock calipers) and was at VIR as well they were fine and better than the Hawk HP+ I was using before

BTW, I meant to give you my contact info, but we left before you finished your run. PM sent

redtopz

What kind of tires?

DansBlkonBlkZ06

Nitto NT-01s

DansBlkonBlkZ06

I ran a set of Toyo R888s one session and the same thing happened with those tires: initial lockup and then ABS kicked in about 1/2 a second later. I'm running the ST-43 pads on the rears. The Wilwood brakes are brand new too.

moose.b3

I run ST47's front and ST-43's rear on a fairly stock 08Z and really like the raybestos pads. I don't have any of the problems you are having and seldom feel the abs unless i'm in over my head. Besides the R888's, I give these pads a lot of credit for lowering my lap times.

redtopz

Yes the ST47's have a lot of bite like a hawk dtc70 so you can't stab the brake pedal. Smoothly and quickly squeeze the brake pedal and try to keep your heel on the floor for better control and modulation. You can lock up tires with any brake pad, but it becomes easier with racing pads and you're not running full slicks so you will have to adapt as a driver. I think once you get used to the bite, you will be able to avoid triggering abs.

Hat_Trick_Hokie

On a C5 with stock calipers and Hoosier scrubs: I went from the DTC 70/60 split to trying the Raybestos ST47 pads on all four corners at Watkins Glen and saw the same phenomenon with locking up the brakes. Not that I can’t lock up the brakes with Hawks, but the ST47 pads just seemed to lock up much easier. I went back to the Hawks which seem more controllable (easier to modulate).

On the other hand I was very impressed with the pad life, the ST47’s barely saw any ware over a two-day event.

DansBlkonBlkZ06

Good points. Since they are new big brakes with aggressive pad, I think I'm just used to punching the brake pedal to the floor. Thanks for the comments.

Werks

For those of you that have ran the RS-47 pads in the past woudl you consider them to be hard on rotors or do they exhibit little rotor wear?

moose.b3

I got 6 track days on the stock front rotors with the ST-47 pads done also. The rear rotors and pads(ST-43) look like I'll at least double that.

DansBlkonBlkZ06

The ST47s aren't bad on rotors at all. No grooving this past weekend.

RaleighSS

another fan of the ST47s here .... they have been good to me and ran hawk / PFC and other brands of comparable compound ... and these stand right there if not a touch above for my personal driving style :-) never had them lock up on me without it being totally expected. Been able to modulate and not been too tough on rotors.

ZedO6

I ran Carbotech's and burned through the XP12/10 combo in a little over 2 events, on the easy braking track out here. IMHO, the ST47 performance is better and they last longer...I think they may even dust a bit less.

redtopz

You should try ST45 or 43 in back. It's likely the 47's are locking up your rears. I was running 47's in back and had the same issue, but after switching to 47 front 45 rear my brakes are great.

Werks

Have any of you that have ran the ST47's also ran Ragid RS-19's or RS-29's aka Pagid Yellow's (their endurance compound) before and if so can you give a comparison on overall brake performance and rotor wear?

redtopz

I ran last weekend with no ABS and the 47's were very difficult to keep from locking up. I'm going to try some pfc-11's and see how I like those. They are supposed to be new and improved over the 01's. Otherwise, back to DTC70's which I have always liked. I want to make my brakes harder to lock up. My car has a larger master cylinder so it's harder to modulate the pedal.

When abs is working...

RDnomorecobra

I would think the 47's are too much for the NT01's. Maybe would be better balanced with a soft slick.

USA_Z

Prior to switching to an APRacing setup up front I was running ST-47's up front and ST-43 in the rear on my C5Z with stock calipers and never experienced a lock up condition. Two seasons worth. That said, I seem to be the worst when it comes to longevity. I'd be lucky to finish a 2-day event without burning through the ST-47's in the front. The ST-43's in the rear lasted for quite a few events no problem. Of course, I'm also running tracks that are very hard on brakes to begin with.

Also, that was with NT-01's.

redtopz

I should add that I had some other brake issues last weekend so I can't just say it's the pads fault that my brakes were locking up. I'm going to try these pads again before switching to see how they do now that I fixed my other issues.