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Does anyone have any braking questions.

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Old 02-09-2018, 12:27 PM
  #1621  
badhabit_wb
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I need to replace the pads on my z06. I just noticed that my rotors have these cracks that I can feel with my thumbnail. Should I replace my rotors at the same time?
Old 02-09-2018, 12:36 PM
  #1622  
KNSBrakes
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Originally Posted by badhabit_wb
I need to replace the pads on my z06. I just noticed that my rotors have these cracks that I can feel with my thumbnail. Should I replace my rotors at the same time?
That looks like it is getting close. And you certainly have some pad smear.

Is that a C7Z w/ iron rotors?

http://www.knsbrakes.com/c/car-serie...2FCorvette+Hat
Old 02-09-2018, 12:38 PM
  #1623  
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Yep a c7z
Old 02-09-2018, 01:35 PM
  #1624  
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Originally Posted by badhabit_wb
I need to replace the pads on my z06. I just noticed that my rotors have these cracks that I can feel with my thumbnail. Should I replace my rotors at the same time?
If it were me and my car, I wouldn't be in a terribly big hurry to replace it if I was driving on the street. If I was driving on the track however, I'd get a fresh one.
Old 02-09-2018, 01:42 PM
  #1625  
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Originally Posted by JRitt@essex
If it were me and my car, I wouldn't be in a terribly big hurry to replace it if I was driving on the street. If I was driving on the track however, I'd get a fresh one.
I'll be at VIR in two weeks
Old 02-09-2018, 02:01 PM
  #1626  
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Originally Posted by badhabit_wb
I'll be at VIR in two weeks
We have replacement rings in stock in South Boston VA which can be delivered to the store at VIR. We should be at the THSCC event as well.

Are those XP10's?

Ken
Old 02-09-2018, 02:05 PM
  #1627  
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Originally Posted by KNSBrakes
We have replacement rings in stock in South Boston VA which can be delivered to the store at VIR. We should be at the THSCC event as well.

Are those XP10's?

Ken
xp-12's
Old 02-09-2018, 04:01 PM
  #1628  
Bill Dearborn
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That is the kind of situation where I used to carry some spares with me and then run the heat checked rotor until it was much closer to cracking. A lot of times I found I could get a day or two out of something like that. However, if you don't have the spare you know it won't last, just the way things are.

Bill
Old 02-09-2018, 04:03 PM
  #1629  
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Originally Posted by Bill Dearborn
That is the kind of situation where I used to carry some spares with me and then run the heat checked rotor until it was much closer to cracking. A lot of times I found I could get a day or two out of something like that. However, if you don't have the spare you know it won't last, just the way things are.

Bill
Yeah I'm thinking it might be better to go ahead and swap them out before a weekend at VIR. That probably makes more sense than having to do it at the track with limited tools etc.
Old 02-09-2018, 04:06 PM
  #1630  
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Originally Posted by badhabit_wb
xp-12's
I saw the red pad so. 1521 for street use?
Old 02-09-2018, 04:09 PM
  #1631  
Bill Dearborn
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Originally Posted by badhabit_wb
Yeah I'm thinking it might be better to go ahead and swap them out before a weekend at VIR. That probably makes more sense than having to do it at the track with limited tools etc.
This is when I usually swap them out.





Bill
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Old 02-09-2018, 04:12 PM
  #1632  
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Originally Posted by KNSBrakes
I saw the red pad so. 1521 for street use?
Yeah I put them on when I got home but haven't driven much with them on it.
Old 02-09-2018, 04:15 PM
  #1633  
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Originally Posted by Bill Dearborn
This is when I usually swap them out.





Bill
They look ready! Mine would probably make it a day but I doubt 2 and who know's what the weather will be like. I'd hate to have them fail at the track and then lose the rest of the weekend.
Old 02-09-2018, 07:35 PM
  #1634  
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FWIW I'd keep running them but I always carry spare pads and rotors to the track. I use the spares for street pads so I don't have to mess with bedding them normally when going from street to track. If I need them at the track though I can just throw them on and bed the track pads.
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Old 02-11-2018, 09:59 AM
  #1635  
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Default C3 74. Rear brakes will not bleed

I recently purchased a 74 C3 that has sat for 10 years. Pedal went straight to the floor. Pulled all four wheels. Noticed front left caliper was leaking. Removed and had both front calipers rebuilt. New brake lines and had rotors turned. Rear brakes seemed fine. Bled brakes the conventional way with wife pressing the pedals...back brakes would not bleed..I went to front brakes and they bled fine. Have about 2/3 pedal. Reopened rear bleeder valves but still no fluid.. Had wife push pedal as hard as she could but no juice..... Any help would be useful.. Headed to garage now to remove rear brake lines from calipers to see is I have fluid to them. Noticed 2 bleeders on rear brakes..Any sequence to bleeding them? HELP
Thanks. SP
Old 02-11-2018, 02:28 PM
  #1636  
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The fronts didn't have two bleeders? I thought all stock C2/C3 calipers had two bleeders but the last time I worked on a C3 was over 30 years ago. I can't remember the GM instructions for bleeding the C3 brakes but their instruction for the newer C6 and C7 fixed calipers is to bleed the inner first. However, some aftermarket companies like Wilwood say to do the outer first. I have been using the outer sequence on my stock C6Z and C7Z brakes with no issues.

Hopefully, you get your fluid problem resolved. Were the front calipers stainless steel lined? I wouldn't trust any caliper that hasn't at least had a stainless steel lining installed. Of course you can also get into the discussion of lip seal vs O ring seal. The stock lip seal is better from a brake performance stand point whereas the O ring is more durable. If you are going to use the car for some autocross or track events the lip seal would probably work better.

Bill
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Old 02-11-2018, 02:59 PM
  #1637  
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Originally Posted by Bill Dearborn
The fronts didn't have two bleeders? I thought all stock C2/C3 calipers had two bleeders but the last time I worked on a C3 was over 30 years ago. I can't remember the GM instructions for bleeding the C3 brakes but their instruction for the newer C6 and C7 fixed calipers is to bleed the inner first. However, some aftermarket companies like Wilwood say to do the outer first. I have been using the outer sequence on my stock C6Z and C7Z brakes with no issues.

Hopefully, you get your fluid problem resolved. Were the front calipers stainless steel lined? I wouldn't trust any caliper that hasn't at least had a stainless steel lining installed. Of course you can also get into the discussion of lip seal vs O ring seal. The stock lip seal is better from a brake performance stand point whereas the O ring is more durable. If you are going to use the car for some autocross or track events the lip seal would probably work better.

Bill
Thanks Bill, I had Vette Brakes in St.Petersburg, Fl rebuild the calipers. Lip seal I believe. Worked for 3 hours today and did get fluid to the right rear. The left rear is still a mystery. I will break the line where the rear splits and try to blow the line out with air. Thanks for your reply.

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Old 02-25-2018, 08:53 PM
  #1638  
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New rear rotors with a light bedding... what’s happening with the 2 different surfaces?

Maybe some taper in the pads and not making full contact with rotor? Same on both sides.
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Old 02-26-2018, 01:00 PM
  #1639  
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Originally Posted by Joshboody
New rear rotors with a light bedding... what’s happening with the 2 different surfaces?

Maybe some taper in the pads and not making full contact with rotor? Same on both sides.
Clearly alignment between rotor vs pad. Did you properly lubricate where you are supposed to? Did you use the correct caliper hardware?

For a while I ran without the (stainless steel spring steel) hardware and did not even realize it (rears).

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Old 02-26-2018, 01:28 PM
  #1640  
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Originally Posted by froggy47
Clearly alignment between rotor vs pad. Did you properly lubricate where you are supposed to? Did you use the correct caliper hardware?

For a while I ran without the (stainless steel spring steel) hardware and did not even realize it (rears).

Thanks, this makes sense. Maybe worn spring plate. I also have 1 backing plate spacer stacked on the inside and not outside... maybe this has an effect.


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