Stop Tech Level 2 front brake kit
 

My stop tech L2 front brake kit just arrived.

Amazingly good packaging and the parts look fantastic. Confirmed 32mm leading and 36mm trailing pistons. 100% compatible without the need to change the master cylinder.

Rotors are beefy and have a hat design that really isolates the hot rotor from the hub.

Here is the difference in size between the STR-43 caliper and the stock ATE caliper. Pad volume difference is 2x.

http://forums.pelicanparts.com/uploa...1592441312.jpg

Comes in two boxes. All packed to prevent damage and keep the box weight to ~25
Lbs. left and right rotors and calipers. Nice aluminum adapters. 309 pad compound included
http://forums.pelicanparts.com/uploa...1592441312.jpg

You can see the swept cooling fins (44 total). And the minimal contact between the hat and the rotors.
http://forums.pelicanparts.com/uploa...1592441365.jpg

Is there an unsprung weight penalty?

Aluminum Calipers are much lighter. Rotor is heavier but the hats are aluminum. Probably a wash; my scale is not accurate enough to tell.

Stop tech kit is 5 lbs lighter

Had to double-up the parts and level the scale to get repeatable measurements
I’d treat these numbers as relative and not dead-accurate.

SC system 39lbs
21 lbs - 20mm rotors
17 lbs- ATE M steel calipers
1 lb - pads

Stop tech level 2: 34 lbs
21 lbs - 28 mm rotors and hats
11 lbs - aluminum calipers and adapter brackets
2 lbs - pads

The assembled rotor uses both steel and aluminum efficiently verse the all steel 20mm rotors

Note the Carrera front brakes are even heavier with the wide-M calipers and 24mm rotors.

All aluminum calipers are significantly lighter than stock steel calipers.

It should be noted the stoptech pads are longer but narrower.

This means the rotor wear surface is narrower. And lighter. The od are identical at 282mm


The added radial height in the stock rotors is pretty useless because the squarish pad only makes partial contact with the rotor. Losing this contact area will have minimal to no impact. I am not concerned.

Mike, If you can measure the distance from the axle center to the installed pad midline, that would be great

First pass measurement

Stoptech 235mm mid contact

Stock 226, (231mm accounting for the lack of inner surface contact area.)

235/226 = 4% larger torque arm
235/231 = 2% larger torque arm

http://forums.pelicanparts.com/uploa...1592498465.jpg

http://forums.pelicanparts.com/uploa...1592498465.jpg

Front left installed. Easy!

And the 6” wide Fuchs fit. That inner surface of the wheel is the fundamental problem with 15” and 16” Fuchs. That is why a spacer is needed to get enough room for the caliper to fit. This is what hurts bigger brake kits as the wheel has to be pushed outward to clear the ends of the caliper.
http://forums.pelicanparts.com/uploa...1592564481.jpg

http://forums.pelicanparts.com/uploa...1592564593.jpg

Mount bracket is pretty
http://forums.pelicanparts.com/uploa...1592566037.jpg

Supplied brake line comes with integral mount that is compatible with the stock bilstein strut. Nice touch.

http://forums.pelicanparts.com/uploa...1592566140.jpg

That is a NICE looking bit of kit. Track day ready...
I would consider de-badging them if possible. They’re quite proud of their logo.

Logo isn’t too bad, and hardly visible through the Fuchs windows. I’m ok with it.

I went with the anodized finish to be more in line with the stock dull metal look of the ATE calipers.

Anodized is also cheaper than the black, red, or yellow options. Marginal utility of painted calipers is $0.00 to me.http://forums.pelicanparts.com/uploa...1592572244.jpg

So no additional changes needed and you don't need to run a wheel spacer? It's nice to see more options available for us.

Correct

Bias is a little bit more on the front.
Master cylinder stays the same
6” wide Fuchs fit without spacers

Caveat: I am using the non-dust seal version of the STR-43 caliper. This is fine for me because this is a track car with dry weather street driving.

You will need a shallow spacer to fit the dust-seal version of the STR-43 caliper.

I'll be curious to hear your review after some track driving.

Lime rock on 6/25
Thompson on 6/27

Should be a valid test.

What organizations are you running with?

PCA Connecticut valley 6/25
SCDA on 6/27

What car are those mounted on? If an SC you may be able to add the Carrera restrictor to even out the F/R Bias, but Bill V. will know exactly what to do.. :)

Would it be inappropriate to ask $? That's a very nice kit.

Yes an SC. I’m not worried about the small bias change. Tires, air pressure, camber, temperature all affect braking. 4% difference is not something I think is significant.

$1749. Some places have it for about the same.

I wanted to go see that event at limerock but it's closed to spectators.

The kit looks like it will get the job done. Looking forward to the track results. Did stoptech give you any idea of the pad. Characteristics? Are there any pad options?

I see you have ducted air to the rotor. I just did that to my M braked, (broken :-) 74, but haven’t had a chance to track it yet. How effective was that on your car?

Are the screens for clag, or do you have some other duct plugging hazard??
Thanks,
Chris

There are many brands of pads available. Stoptech ships with their 309 sport compound. This is supposed to be light track use.

I just bought a set of hawk HT-10 pads. I’ll used those for the track in the next few days. I’ll keep the 309s for street.

You can also get Porsche pads in the 309 compound. I just installed them in the back

I really want to go to Pagid RSL-29 yellow pads. Right now I’d have to use a slightly larger height pad to fit (2555 size) verses 2205. It’s a $290 gamble, but I really like the Pagid 29s. Street and track = no pad swaps.

The ducting really helps and the screens are to stop big stuff going into the scoops.

Done
http://forums.pelicanparts.com/uploa...1592661354.jpg

One significant point:

I am not expecting a deceleration benefit. This upgrade was more about heat rejection and how that affects pads life and hub temperatures.

What I hope will happen is I get faster recovery, and less change in pedal travel over the course of a session.

Less heat into the aluminum hubs as evidenced by grease weeping from the caps.

Longer pad life. Especially if I can get the Pagid 29s to fit. Watkins glen 2-day events really burn the pads down.

First impressions

Bedded brake pads and the feel and modulation is great. 309 compound seems good for the street.

OMG it is so easy to bleed the brakes with dual bleed ports!!!

None of the issues with the ATE caliper being spongy due to a trapped air bubble.

Firm pedal from the get go.

I looked at the stop tech web site. I could not fine front brakes. Do you have a part number?

83.782.FT00.A1 is the kit I bought.

Finding the proper website seems harder than it should be.

Thanks

Is that per side?

I got my full ST level 2 system a year ago, and am very happy with it. While I don't still have the specific individual component weights, I recall my ST system averaged 6 lbs. per corner lighter than the stock 911SC system I replaced.

Total weight reduction was about 5 lbs to the SC.

About 8-9 lbs lighter compared to the wider Carrera rotors and wide-m calipers.

so this kit is examplarily installed on a SC (1978-1980)

I understand:
- no change of master cylinder
- no change of front hubs
- no spacers/adaptation neede with 16 Fuchs
- you get the hats and rotors, mount them to the hub and install everything with the provided caliper adapter and brake line.

job done.

correct?

Looks good.
Thinking on getting this kit. Should fit nice behind 17'' wheels.

cant find it. only 83.782.DT00.A1 (slotted) or A2 (drilled)

https://www.apcautotech.com/part-detail/83782dt00a2?year=1979&make=porsche&model=911

FT00 uses the larger st43 caliper without dust seals.

Yes the front brakes are 100% compatible with 911SC and 84-89 Carreras.

If you google the part number you get multiple companies selling them.

Would you mind sharing a link to the vendor's site? If not kosher to post publicly, then please PM me.

what interests me the most are the hats and 28-282 rotors from this set.

they have the same SC/Carrera diameter (282) but provide more width with their 28mm.
SC has 20 and Carrera 24

these and the offset of the hats will fit my 964 C2 calipers on my SC.

But I'm having a hard time finding a StopTech partnumber.

help?

I just did a google search on “stoptech replacement rotor”

Got multiple hits. Your choice as to order from.

I will cost 2x(345+230) to but just hats and rotors without the full kit.

And?

I do find a lot of stuff, I tracked down the sets, got the numbers for "race" and street" even separated tha caliper colors, I got the rotors (drilled or slotted)...but e.g. I can't find the hats as single

Any more updates on the brakes?