03-07-2022, 03:22 PM | #23 | |
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Most/all BBKs have rotors of less quality than Giro for example. They do not have Ti pistons. Many times they lack dust boots so they are a liability in winter. Most of the people that just buy a bbk likely don't need one so they don't run into issues. Others, like myself, end up swapping AP Radicals for BW-Alcons for example because of performance. I have 7 days on a set of Girodiscs, which is about as long as AP Radical rotors lasted, yet the Girodiscs need to be inspected at 1 inch to see heat checking, much less actual cracking. |
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03-07-2022, 03:49 PM | #24 |
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Apparently stainless steel has worse thermal conductivity than titanium. So titanium pistons would be worse than stainless.
Aluminum 205 w/mk Titanium 17 w/mk Stainless 15 w/mk Obviously titanium is lighter weight, but is that worth triple the price? Last edited by uncle ben; 03-07-2022 at 05:08 PM.. |
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D_SheerDrivingPleasure1103.00 sly1types431.50 |
03-08-2022, 04:39 AM | #25 |
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Titanium is 40% lighter than steel with greater strength than most 300 series stainless steel alloys. Titanium is more resistant to heat than stainless steel and has a much lower coefficient of thermal expansion. Unlike most steel alloys, titanium is not prone to embrittlement at very low cryogenic temperatures.
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01-30-2023, 06:44 PM | #26 | |
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Im on the fence of doing this upgrade. If im going to go with girodiscs and stainless lines it might make sense considering the amount of bleeding that will take place. |
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01-30-2023, 06:55 PM | #27 | |
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02-03-2023, 12:15 PM | #28 |
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A little late but they use grade 5 titanium alloy and not pure titanium. Grade 5 ti has thermal conductivity of 6.7 W/m-K
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02-06-2023, 08:36 AM | #29 |
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09-05-2023, 06:07 PM | #30 |
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Wanted to share my rebuild on this thread because the info here helped me out a lot.
Long story short, old pistons AND seals were damaged by the idiot who powdercoated my calipers so I said screw him and decided to tackle the rebuild with upgraded pistons myself. Used a small air compressor with a rubber tip at around 90 PSI. Popping out the pistons was an absolute pain in the ass. Personally I found that using cut up pieces of old Amazon boxes worked way better than using a piece of wood. The cardboard compresses, minimizing damage and it allows me to stack them together to get the exact tight fit I needed. PLEASE do not stick a finger in between the pistons. Even at 30PSI, the piston closest to the brake line will pop out with EXTREME force. |
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09-07-2023, 02:39 PM | #31 |
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Danlnyc88 I ended up using cardboard also as wood is not ever the right thickness. The compressor and nozzle method is the best method. Cover your caliper with a rag or your going to get blasted in the face with fluid!
Those look awesome BTW! |
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09-07-2023, 03:04 PM | #32 | |
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Good job! Can you tell me where did you buy the M lettering? |
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09-07-2023, 03:18 PM | #33 |
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It was a reflective one I found from Amazon. They're slightly bigger than OEM though. Have to buy 2 sets for all 4.
Honestly if I had it my way I would have these redone professionally using high temp decals with clear OVER the decal. If you get yours powdercoated see if they can get you some high temp ones or source some yourself. Unfortunately, the mine was done poorly.....it is what it is. I'll get them redone eventually. |
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09-08-2023, 01:40 PM | #34 | |
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09-08-2023, 04:46 PM | #35 | |
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12-06-2023, 04:59 PM | #37 |
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12-06-2023, 06:42 PM | #38 | |
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Are the rear pistons 44mm x 32mm?
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12-07-2023, 09:31 PM | #39 |
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The diameter, and the position and size of the seal groove that’s located on the piston. How wide and how deep the seal groove is and how far it is from the outside edge of the piston, as well as the pistons overall length.
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04-20-2024, 08:00 AM | #40 |
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Very nice diy and write up. What is the advantage of upgrading the pistons? Are the stock ones not stainless steel?
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04-20-2024, 09:40 AM | #41 |
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04-20-2024, 11:51 AM | #42 |
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Thanks for clarifying that. Just found this link from their website that explains some of this.
Looks like the venting notches are supposed to help with reducing heat transfer and lighter weight help with quicker release. Stainless Steel (vs. OE Aluminum) Piston : Lower heat transmittal, only about 10% of aluminum Less brake fluid replacement & down time. Better dimensional stability (Lower heat expansion rate) More rigidity means more efficient in brake torque transmittal. https://racingbrake.com/why-rb-stainless-steel-piston/ |
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