Changing Breaks
Popular Reply
03-04-2024, 11:13 AM
I don't mean to sound like a douche but it's brakes not breaks. The total brake system is a combo of disks, calipers, brake lines and brake fluid so you are definitely on your way with the brakes and calipers. I don't know if the brake lines and fluid are different in the Z51 cars? Someone on here smarter than me about this can chime in.......
#2
I don't mean to sound like a douche but it's brakes not breaks. The total brake system is a combo of disks, calipers, brake lines and brake fluid so you are definitely on your way with the brakes and calipers. I don't know if the brake lines and fluid are different in the Z51 cars? Someone on here smarter than me about this can chime in.......
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#3
As correctly pointed out by @killian96ss , in a post he apparently deleted later, the brake system is not entirely by wire. When fully functional feeback to the pedal is regulated by the software, but in the event of a failure, there is actually a connection from the pedal to the hydraulic system.
Last edited by Andybump; 03-05-2024 at 09:29 AM. Reason: delete reference to by wire
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proeagles (03-04-2024)
#5
Melting Slicks
What Andybump said. It's not like the old days anymore as computers control everything on these cars. It may or may not work. Next question for me is why convert a perfectly good dust free braking system for street driving to something totally unnecessary. You still won't have all the required cooling to run the car on the track anyway which will void your warranty.
#6
Racer
I don't mean to sound like a douche but it's brakes not breaks. The total brake system is a combo of disks, calipers, brake lines and brake fluid so you are definitely on your way with the brakes and calipers. I don't know if the brake lines and fluid are different in the Z51 cars? Someone on here smarter than me about this can chime in.......
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#10
Safety Car
I don't mean to sound like a douche but it's brakes not breaks. The total brake system is a combo of disks, calipers, brake lines and brake fluid so you are definitely on your way with the brakes and calipers. I don't know if the brake lines and fluid are different in the Z51 cars? Someone on here smarter than me about this can chime in.......
Last edited by gliot1; 03-04-2024 at 08:18 PM.
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Fishfryer527 (03-04-2024)
#11
I don't mean to sound like a douche but it's brakes not breaks. The total brake system is a combo of disks, calipers, brake lines and brake fluid so you are definitely on your way with the brakes and calipers. I don't know if the brake lines and fluid are different in the Z51 cars? Someone on here smarter than me about this can chime in.......
Why the need for the Z51 brake upgrade?
If you are planning to track the car, there is more too it than just the brakes. Extra cooling capacity for the DCT is a big one, plus you will insta-void your warranty if your car goes near a track.
#12
Racer
#13
Race Director
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If you decide to upgrade, I have a set of Z51 rotors listed in C8 parts for sale.
#14
@killian96ss , your explanation, attached, seems inconsistent with the description in the Service Manual. No vacuum booster at all. However, as you pointed out, in the event of a failure, the the driver pedal input will be mechanically transferred to the hydraulic system, so in the event of a failure its not brake-by-wire. I have fixed that error in my earlier post - thanks.
Last edited by Andybump; 03-05-2024 at 09:57 AM.
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dohabandit (03-05-2024)
#15
Last edited by mikegr; 03-05-2024 at 09:36 AM.
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dohabandit (03-05-2024)
#16
@Andybump What's weird in my brake failure on the track was that I got no warning indications. I didn't sense or feel any brake fade. I was going ~100mph approaching a turn and was braking 100% getting into balance. About 75% of the way into the braking zone my brakes failed.
I got a big red box on the DIC that said "BRAKE SYSTEM FAILURE". Suddenly I had no brakes, the pedal was very stiff. Not spongy like there was air/bubbles in the lines from boiling. I ended up taking the turn quite a bit faster than I had planned to, but fortunately it was a high banked turn!
My brakes are working fine now. Rotors look fine, pads are good, there was no discoloration of the Motul660 when I pulled it out and replaced it with Castrol SRF. So I am really scratching my head as to what actually caused the failure? Wondering if the issue is a loose wire in the electroboost system or something. In which case, I could have another unwelcomed surprise on the track.
Given the complexity of everything in the C8 (hardware and software), and the warranty issues with tracking a non-Z51 car, I think the best approach to "upgrading" to Z51 is to sell your car and buy a Z51 spec'd car off the lot. The 2LT/Z51 combo is the most popular ordered C8 and there are quite a few available these days. Even better, look for one with FE4/Z51, MSRC, PTM, PDR options.
I got a big red box on the DIC that said "BRAKE SYSTEM FAILURE". Suddenly I had no brakes, the pedal was very stiff. Not spongy like there was air/bubbles in the lines from boiling. I ended up taking the turn quite a bit faster than I had planned to, but fortunately it was a high banked turn!
My brakes are working fine now. Rotors look fine, pads are good, there was no discoloration of the Motul660 when I pulled it out and replaced it with Castrol SRF. So I am really scratching my head as to what actually caused the failure? Wondering if the issue is a loose wire in the electroboost system or something. In which case, I could have another unwelcomed surprise on the track.
Given the complexity of everything in the C8 (hardware and software), and the warranty issues with tracking a non-Z51 car, I think the best approach to "upgrading" to Z51 is to sell your car and buy a Z51 spec'd car off the lot. The 2LT/Z51 combo is the most popular ordered C8 and there are quite a few available these days. Even better, look for one with FE4/Z51, MSRC, PTM, PDR options.
#17
Burning Brakes
@killian96ss , your explanation, attached, seems inconsistent with the description in the Service Manual. No vacuum booster at all. However, as you pointed out, in the event of a failure, the the driver pedal input will be mechanically transferred to the hydraulic system, so in the event of a failure its not brake-by-wire. I have fixed that error in my earlier post - thanks.
I've never liked the term "brake by wire" because it's easily confused with "drive by wire" where the gas pedal has no mechanical link to the throttle body, but in the brake system there is still a mechanical link.
#18
@Andybump What's weird in my brake failure on the track was that I got no warning indications. I didn't sense or feel any brake fade. I was going ~100mph approaching a turn and was braking 100% getting into balance. About 75% of the way into the braking zone my brakes failed.
I got a big red box on the DIC that said "BRAKE SYSTEM FAILURE". Suddenly I had no brakes, the pedal was very stiff. Not spongy like there was air/bubbles in the lines from boiling. I ended up taking the turn quite a bit faster than I had planned to, but fortunately it was a high banked turn!
My brakes are working fine now. Rotors look fine, pads are good, there was no discoloration of the Motul660 when I pulled it out and replaced it with Castrol SRF. So I am really scratching my head as to what actually caused the failure? Wondering if the issue is a loose wire in the electroboost system or something. In which case, I could have another unwelcomed surprise on the track.
Given the complexity of everything in the C8 (hardware and software), and the warranty issues with tracking a non-Z51 car, I think the best approach to "upgrading" to Z51 is to sell your car and buy a Z51 spec'd car off the lot. The 2LT/Z51 combo is the most popular ordered C8 and there are quite a few available these days. Even better, look for one with FE4/Z51, MSRC, PTM, PDR options.
I got a big red box on the DIC that said "BRAKE SYSTEM FAILURE". Suddenly I had no brakes, the pedal was very stiff. Not spongy like there was air/bubbles in the lines from boiling. I ended up taking the turn quite a bit faster than I had planned to, but fortunately it was a high banked turn!
My brakes are working fine now. Rotors look fine, pads are good, there was no discoloration of the Motul660 when I pulled it out and replaced it with Castrol SRF. So I am really scratching my head as to what actually caused the failure? Wondering if the issue is a loose wire in the electroboost system or something. In which case, I could have another unwelcomed surprise on the track.
Given the complexity of everything in the C8 (hardware and software), and the warranty issues with tracking a non-Z51 car, I think the best approach to "upgrading" to Z51 is to sell your car and buy a Z51 spec'd car off the lot. The 2LT/Z51 combo is the most popular ordered C8 and there are quite a few available these days. Even better, look for one with FE4/Z51, MSRC, PTM, PDR options.