Porsche Brembo 996 BBK Conversion-- let's figure out how to fix the dust boots/seals

[heinzboehmer]

Details on the brake scoops? I feel like I read something else from you about those but can’t remember where or when.

They're 3D printed, Porsche-style, two piece scoops designed by Bry5on. On part goes on the control arm and the other on the dust shield/shock. Dust shield piece needs to be a fairly temp resistant material (mine is PET-CF), but the lower one can be almost whatever (mine is ABS).

More info and files here:

• https://nam3forum.com/forums/forum/m...ge6#post253963
• http://bry5on-nam3forum.sfo2.digital...step_files.zip

Holy shit! YES!

... I wonder how important the shims are. I'd rather not...

We'll have to see how long they last, but so they've beat all the others!

What makes you hesitant to run the shims?

ZCP front rotors are the same width as the Boxster ones, but the ZCP rear rotors are 20mm wide vs the 24mm wide Boxster rotors. Minimum thickness spec from Porsche is 22mm, which means I can run the rear pads to the backing plate with the 1mm shims in place and not worry about popping a piston out. This isn't really what the shims are for, but they do let me sleep a bit better at night.

Mind sharing a link to the exact boots you bought?

I bought two of these, but only used the dust boots: https://www.ohioperformancesolutions...bo-rebuild-kit

Glad you were able to test them at the track! I would love to say they will last forever but that would not be honest. Silicone, like other components in the braking system, will eventually break down over time and heat cycles. Thats just the nature of the beast. They will for sure outlast anything out there by quite a large margin. AP Racing, Alcon, wildwood, etc all do not have dust boots on their calipers for a reason but that comes with a sharp hit to your wallet!.

Yeaah you're totally right. Was probably a bit overzealous with the "forever" comment

I'm just happy that these lasted for more than 1 track day.

Let me know if you all want other kits made up. Frenkit is constantly improving their products which is good in this industry.

Dust boot only kit would be great! I'll have to swap these out at some point, so being able to just buy the dust boots would be nice.

[Obioban]

Glad you were able to test them at the track! I would love to say they will last forever but that would not be honest. Silicone, like other components in the braking system, will eventually break down over time and heat cycles. Thats just the nature of the beast. They will for sure outlast anything out there by quite a large margin. AP Racing, Alcon, wildwood, etc all do not have dust boots on their calipers for a reason but that comes with a sharp hit to your wallet!.

Let me know if you all want other kits made up. Frenkit is constantly improving their products which is good in this industry.

If anyone has some 44 dust boots they need let me know as I have extra that I'm giving away (pay for shipping). I would love to have someone with a 36/44 caliper (porsche) put one of Frenkits dust boots along with the ones they have been running just to show the difference in quality. Or anyone with an SRT...

Mike
OPS

Personally, I'd like a kit that is just the dust boots, not the piston seals. Suspect I'm far from alone in that. Stock piston seals last just fine.

[OPS]

Alright, Frenkit/OPS boots survived the 3.5 hrs of torture I put them through at Thunderhill on Monday. Pretty happy with that!

These boots are the only thing I changed since the last track day (which destroyed the GiroDisc boots), but here's a recap of the full setup:

• 996 calipers
• ZCP rotors
• PFC08 pads (at ~40% life left)
• GiroDisc titanium shims
• Bryson brake scoops
• RBF600

Hopefully these survive forever and I never have to swap another set of dust boots on these calipers.

Glad you were able to test them at the track! I would love to say they will last forever but that would not be honest. Silicone, like other components in the braking system, will eventually break down over time and heat cycles. Thats just the nature of the beast. They will for sure outlast anything out there by quite a large margin. AP Racing, Alcon, wildwood, etc all do not have dust boots on their calipers for a reason but that comes with a sharp hit to your wallet!.

Let me know if you all want other kits made up. Frenkit is constantly improving their products which is good in this industry.

If anyone has some 44 dust boots they need let me know as I have extra that I'm giving away (pay for shipping). I would love to have someone with a 36/44 caliper (porsche) put one of Frenkits dust boots along with the ones they have been running just to show the difference in quality. Or anyone with an SRT...

Mike
OPS

[Obioban]

Mind sharing a link to the exact boots you bought?

[Obioban]

Alright, Frenkit/OPS boots survived the 3.5 hrs of torture I put them through at Thunderhill on Monday. Pretty happy with that!

These boots are the only thing I changed since the last track day (which destroyed the GiroDisc boots), but here's a recap of the full setup:

• 996 calipers
• ZCP rotors
• PFC08 pads (at ~40% life left)
• GiroDisc titanium shims
• Bryson brake scoops
• RBF600

Hopefully these survive forever and I never have to swap another set of dust boots on these calipers.

Holy shit! YES!

... I wonder how important the shims are. I'd rather not...

[Nate047]

Alright, Frenkit/OPS boots survived the 3.5 hrs of torture I put them through at Thunderhill on Monday. Pretty happy with that!

These boots are the only thing I changed since the last track day (which destroyed the GiroDisc boots), but here's a recap of the full setup:

• 996 calipers
• ZCP rotors
• PFC08 pads (at ~40% life left)
• GiroDisc titanium shims
• Bryson brake scoops
• RBF600

Hopefully these survive forever and I never have to swap another set of dust boots on these calipers.

Details on the brake scoops? I feel like I read something else from you about those but can’t remember where or when.

[heinzboehmer]

I'll try the OPS boots next, if those crack, I'll throw these calipers off a cliff and get something more appropriate.

Alright, Frenkit/OPS boots survived the 3.5 hrs of torture I put them through at Thunderhill on Monday. Pretty happy with that!

These boots are the only thing I changed since the last track day (which destroyed the GiroDisc boots), but here's a recap of the full setup:

• 996 calipers
• ZCP rotors
• PFC08 pads (at ~40% life left)
• GiroDisc titanium shims
• Bryson brake scoops
• RBF600

Hopefully these survive forever and I never have to swap another set of dust boots on these calipers.

[OPS]

Yes thats me! Sorry the Megane calipers are new to me!

[bavarian3]

heinzboehmer Tbonem3 maupineda Thanks all.

I ended up ordering complete rebuild kits from OPS (BTW, are you Mike? Appreciate the prompt email support if so).

I'll be doing Megane RS fronts and 996 rear. Hate to tear them apart but I couldn't do the red. 😂

[heinzboehmer]

+1 to replacing. I don't like the risk involved with safety critical components like brakes.

Also, forgot to update here. Bryson scoops slow down the cracking of the boots significantly, but unfortunately can't fix the small thermal mass of these calipers + pads. Cracking starting again:



I'll try the OPS boots next, if those crack, I'll throw these calipers off a cliff and get something more appropriate.

[OPS]

Personally, I would take fine sand paper to them and send it.

I have done this also when the marks are above the piston seal.

Mike

[Tbonem3]

Personally, I would take fine sand paper to them and send it.

[OPS]

So those marks on the top of the bottom ridge (does that make sense?) will not contact your piston seal. They will cause friction on your dust boot however. I have definitely seen much worse but I agree with maupineda, not worth doing again or risking anything when it comes to breaking imho.

[maupineda]

I did the same, ended up buying new from centric as is a job I did not want to do twice, or worse still, have leaks or scratch the bores of the caliper. they are very cheap.

[bavarian3]

OPS Tbonem3 heinzboehmer


Accidentally scuffed a couple of 996 pistons on disassembly. Wondering what everyone thinks here if this warrants replacement since this shouldn't pass through the inner seal.

If I do need to replace, would I need to replace on both calipers? (This only happened on one caliper.)