Dust Boots burning up constantly

[dogunbound]

I have this exact same issue and am just contemplating saying screw the dust boots, or what is left of them right now.

There are now Titanium shims by Z1, which could / should help keep the heat within the pads. I am getting rid of this Z for a NISMO MT, so I don't want to toss the money at it and instead just fix the calipers upon trade-in, return it to OEM rotors / pads.

No ones looking at burnt boots. Maybe fucked up, but I'd just sell it as is and call it (with street pads).

 

[OptionZero]

Boots are $15 and a rebuild kit is $50, so i think as long as you tell the new owner that they need replacement, should be fine

but

Higher end track and race calipers do not have boots and are designed no to work with boots because they are understood to need inspection and rebuild frequently

Lower end and street calipers have boots because you aren't expected to rebuild them all the time. Dust can impact performance, although the degree with depend on the situation


Don't know if you want to throw more money at the issue, but good 2 piece rotors should have vents that get even more cool air moving through the system that should help. Racing Brake and Paragon have good reps

Lastly, this is nothing against you, but there's also driving style. Some folks are just harder on their brakes. Have you had an experienced driver or instructor sit with you or follow, and maybe give some feedback?

 

[KyleWI]

Boots are $15 and a rebuild kit is $50, so i think as long as you tell the new owner that they need replacement, should be fine

but

Higher end track and race calipers do not have boots and are designed no to work with boots because they are understood to need inspection and rebuild frequently

Lower end and street calipers have boots because you aren't expected to rebuild them all the time. Dust can impact performance, although the degree with depend on the situation


Don't know if you want to throw more money at the issue, but good 2 piece rotors should have vents that get even more cool air moving through the system that should help. Racing Brake and Paragon have good reps

Lastly, this is nothing against you, but there's also driving style. Some folks are just harder on their brakes. Have you had an experienced driver or instructor sit with you or follow, and maybe give some feedback?

I have Paragon 2-piece rotors and was using Carbotech XP10s with it. Only had an issue with the fronts, and it was the hottest day I've ever ran the Z on the track (90°F ambient temp).
I do not have brake ducts like the OP however.

As far as driver mod, I have an (instructor / coach) / lap analysis.

I'll be curious to see as we got more people on the track with their Zs, if we hear more of burnt dust boots.

 

[dogunbound]

An update. I have finally succeded in getting my dust boots to last more than 1 track day!

Looking back, I should have went for the less invasive options first before pulling the trigger and setting up brake ducting, but it is a cool project and will keep my rotors running for longer.

So I rebuilt my calipers for the 3rd or 4th time and intentionally forgo the brake grease that Nissan recommends putting on the boots. I also am using titanium shims to isolate the heat away from the pistons. With these and the brake ducting, no more burnt up boots! If y'all want to try avoiding burnt boots, I'd first try the shims. If they still burn up, rebuild them without grease and the shims. If all else fails, then go ahead and setup ducting.

Good luck future adventurers!

 

[ZULU-1]

Just an innocent observation… given the fact that you list location as Texas, perhaps the issues may be compounded by the ambient temperature at the time of your runs. If able try to do a couple of circuits early in the morning…and as someone suggested earlier, get temp readings at the rotors/pads. Perhaps the comparison may identify ambient temp as a contributing factor. Are you the only driver having temp issues at the track? How about another track with a benign layout (fewer aggressive turns) Also, not knowing your level of track experience/skill… I would recommend discussing brake application techniques with a trusted competition driver. Note: I understand that the 2027 Nismo will get a modified GT-R brake system. I presume your type of problem is more prevalent with the non-Nismo trim levels. As a result, check and see if the new Nismo upgraded brake setup is compatible with the Performance assembly installation specs. See if you can replace your set for the 2027 Nismo OEM hardware; however, wait until the new setup is vetted.

All the best…

 

[KyleWI]

Just an innocent observation… given the fact that you list location as Texas, perhaps the issues may be compounded by the ambient temperature at the time of your runs. If able try to do a couple of circuits early in the morning…and as someone suggested earlier, get temp readings at the rotors/pads. Perhaps the comparison may identify ambient temp as a contributing factor. Are you the only driver having temp issues at the track? How about another track with a benign layout (fewer aggressive turns) Also, not knowing your level of track experience/skill… I would recommend discussing brake application techniques with a trusted competition driver. Note: I understand that the 2027 Nismo will get a modified GT-R brake system. I presume your type of problem is more prevalent with the non-Nismo trim levels. As a result, check and see if the new Nismo upgraded brake setup is compatible with the Performance assembly installation specs. See if you can replace your set for the 2027 Nismo OEM hardware; however, wait until the new setup is vetted.

All the best…

The NISMO front calipers are the same as 24-26 NISMOs besides being darker red and having two-piece rotors as standard equipment now.

Performance Akebono pads actually have Titanium Shims now, whereas NISMO does not from what I've found.

I'd say if someone is upgrading from this just go to a BBK that supports anti-knockback features too. I've also had that issue with Akebono calipers.

 

[dogunbound]

Ah yeah anti-knockback would be nice. I have to pump the brakes before getting into a corner with these calipers.

Yeah I just have the normal performance akebonos. As long as the issue is solved, then that's all that really matters. I don't want to upgrade brakes if I don't have to. They stopped the car just fine before. Now it stops just fine AND it doesn't burn itself up

As for ambient temps potentially being an issue, they were burning up in nice 60 degree weather too.

 

[OptionZero]

i'm working with a lighter chassis (Z34) and also have the shims and have not experienced any braking issues (ducting, z1 rotors, Endless MX72, Endless RF650 fluid)

but it is good to know shims have noticeable positive impact on the RZ34 as well