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Old 01-12-2018, 10:33 PM
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osunick
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I need to replace the bolts that hold the hats to the rotors on my pccb discs. The discs and hats are fine but the bolts are corroded. PET doesn't show these as separate parts- anyone know if there are equivalents available? Thanks!

-n.
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Old 01-13-2018, 08:26 AM
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Johnny DB
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Originally Posted by osunick View Post
I need to replace the bolts that hold the hats to the rotors on my pccb discs. The discs and hats are fine but the bolts are corroded. PET doesn't show these as separate parts- anyone know if there are equivalents available? Thanks!

-n.
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Old 01-13-2018, 10:26 AM
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I'd bet there's not anything particularly unique about the fasteners and that you could use any made for the purpose of attaching the hat to the rotor as long as they're the right diameter and length. Maybe send an email to some of the brake guys and ask (dba, Brembo, Craig at Girodisc, etc}
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Old 01-13-2018, 12:49 PM
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After looking at the design of the assembly, they're not under much stress. The bobbins take on the torque and the bolts and springs keep the disc centered on the hat, but when everything is together the caliper also keeps the ring centered. I'll take things apart and investigate further.
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Old 01-14-2018, 01:53 AM
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I pulled the bolts and they are M5x60mm stainless A2-70 torx cheese head bolts (printed on the head), which is a common grade of stainless steel. Not the strongest which leads me to believe these aren't under much stress, especially with a 7 lb-ft torque spec on the bolt. I ordered some bolts from ebay germany but since I'm not tracking the car any time soon, I'm using the correct size bolt from home depot in a philips head until the new bolts arrive. The bobbins handle the torque load from the brake calipers to the hubs, all the bolts and springs do is keep the disc more or less centered on the bobbins.

Note- make sure you use the guide rods when pulling the rotor off by hand- it's quite surprising how quickly it flies off after some tugging and without anything to hold it on, it can hit the hub.
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Old 01-14-2018, 12:19 PM
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Originally Posted by osunick View Post
I pulled the bolts and they are M5x60mm stainless A2-70 torx cheese head bolts (printed on the head), which is a common grade of stainless steel. Not the strongest which leads me to believe these aren't under much stress, especially with a 7 lb-ft torque spec on the bolt. I ordered some bolts from ebay germany but since I'm not tracking the car any time soon, I'm using the correct size bolt from home depot in a philips head until the new bolts arrive. The bobbins handle the torque load from the brake calipers to the hubs, all the bolts and springs do is keep the disc more or less centered on the bobbins.

Note- make sure you use the guide rods when pulling the rotor off by hand- it's quite surprising how quickly it flies off after some tugging and without anything to hold it on, it can hit the hub.
So are PCCB floating rotors?
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Old 01-14-2018, 12:40 PM
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Originally Posted by Johnny DB View Post
So are PCCB floating rotors?
Yes, it definitely looks that way since the bolts have anti rattle springs.
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