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Old 08-26-2019, 03:26 PM   #15
DandoX
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Originally Posted by EndlessAzure View Post
I pulled both top and bottom pins, cleaned them, and put new OE rubber grease. Pins themselves looked okay. The lower rubber guide bushing was fraying, so I replaced it.

I think they are talking about the caliper piston boots.

Ordered some GT3 brake ducts to help with the cooling
Good call on the cooling, post up some pictures when you get it installed.

Your caliper piston boots looked alright to me, I don't see any serious cracking? @soundman98 What are the indicators that your piston will start to leak, I'm not seeing it and my piston boots look very similar.
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Old 08-26-2019, 04:09 PM   #16
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Originally Posted by DandoX View Post
Good call on the cooling, post up some pictures when you get it installed.

Your caliper piston boots looked alright to me, I don't see any serious cracking? @soundman98 What are the indicators that your piston will start to leak, I'm not seeing it and my piston boots look very similar.
Will do. It is certainly not an original idea, and it's not that involved. Just consists of basically plastic fins off a Porsche GT3 ziptied to the lower control arm.

My piston boots are quite brittle in some parts and crumbling =X. But as mentioned, I'm not too sure how that will necessarily lead to leaks other than the heat affecting the inner o-rings. The visible rubber boots serve mainly as dust covers
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Old 08-26-2019, 04:20 PM   #17
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Good call DandoX.
These pins need to move in and out to keep the pressure equal on both sides of the caliper, they have grease to lubricate and a boot to keep the grease in and the dirt out.
Having a slit and high temp will let the grease out.
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Old 08-26-2019, 09:11 PM   #18
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Your caliper piston boots looked alright to me, I don't see any serious cracking? @soundman98 What are the indicators that your piston will start to leak, I'm not seeing it and my piston boots look very similar.
they're starting to crack. which is an indicator. what happens is that dirt/grime gets in there, and damages the internal piston seal or the piston surface. once either is damaged, the high pressure brake fluid finds a way out
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