Official: Brake Pad Knock Back Thread - Lateral-g Forums

Vegas69 · #1 03-02-2011, 08:14 AM

Yep, the rear bearings have loosened up. I've even thrown some shims behind the races with no noticable change. I want to go floater but hear a certain someone may have a solution in the works.

(not me)

rsk68 · #2 03-02-2011, 09:04 AM

I adapted these to work on my car, it’s not a kit but just some parts that I made work, I had to make my own brackets, knockback is gone and the car stops amazingly well.

Vegas69 · #3 03-02-2011, 09:06 AM

Rick, thanks for sharing your idea. I'm just not sold on a smaller rear caliper as hard as we run these cars.

rsk68 · #4 03-02-2011, 09:49 AM

Todd I agree with you but this did eliminate the problem and overall my brake performance is way better then when i had the 4 piston rears, another problem with this small calliper is they dont make an aggresive pad for it.

I will continue to work on another setup involving a 6 piston caliper that i can convert to a floater, more like a floating bracket.

**Matt@BOS** · #5 03-02-2011, 11:25 AM

Todd, you've been dealing with this problem for what seems like forever. When I started having knock back issues this thread was a wealth of knowledge on the situation. I read this whole thing over carefully, and went back and forth on how I was going to try to address it. Having seen all of the work that you did to try and find an adequate solution, I decided to go with a floater. I wasn't sure whether or not it would be overkill. Yes, tapered bearings and a 1" master cylinder have worked, Bad Penny being an example, but I didn't want to run the risk of having it not work, leaving me having to put up with the problem, or throw more money at it.

From the four autocross runs I did before I had to retire my car, I can tell you I didn't have any problems with the floater under the car. Hopefully nothing pops up after more track miles! I know you're tired of spending money on the car, but IMO the presence of mind in knowing that you wouldn't have to screw around later would be worth the 1500-2000 for the floater.

... You probably didn't need my little testimonial though

Feel free to give me a call if you are seriously contemplating the change, or give the guys over at Wilwood and Speedway a call. They worked together every step of the way, and came up with a solution that was very reasonably priced considering I replaced everything except the third member.

Matt

Vegas69 · #6 03-02-2011, 11:43 AM

Matt, I appreciate your insight. I did speak with Dustin at Wilwood at the event and he mentioned they could adapt a floater to my caliper. Put some more miles on your set up so I know it's a sorted out fix.

Cris@JCG · #7 03-02-2011, 12:09 PM

I drove my old 69 @ RTTC.. Here are the specs on te brake system that I set up 7 yrs ago..

12 bolt rear with stock c-clips
12 inch disc with bridgebolt Dynalites, 1.38 bores, 1/2 thick non-vented rotors
Front- bridgebolt Dynalites, 1.75 bores, 12 inch disc/.810 thick rotors
1.00 bore cast iron 69 Corvette Master cylinder.
I can't even remember what pads I put on it.. but I think they were the old tan pads.. I had brake fade on the first day .. but by the 2nd day pads were gripping & no brake fade.. but was using less brake as I got used to the car & the track..

Never experienced knock back issues!! but was only running 255-18 in the rear & 225-18 in the front..

Quick solution to your problem Todd.. Change to floating calipers in the rear!
Expensive solution.. Full blown floating rear end!!

Quote:

Originally Posted by Vegas69

Matt, I appreciate your insight. I did speak with Dustin at Wilwood at the event and he mentioned they could adapt a floater to my caliper. Put some more miles on your set up so I know it's a sorted out fix.

Vegas69 · #8 03-02-2011, 12:30 PM

Apples and oranges buddy...

**Matt@BOS** · #9 03-02-2011, 05:57 PM

Todd, I forget to tell you I tried the floating caliper thing out. We put the brakes on at BOS, however, it was on the test drive immediately afterward that I got hit by the lady running the red light. so I couldn't tell you whether or not they solved the problem. The C6 Z51 brakes literally have maybe a mile on them. They're just sitting on a shelf full of parts right now. If you want to "try" them out I'll send them your way. If you put a track day on them and they don't work, just send them back, if you want to keep them then we can figure out a price. They are for a 9" though so you would need different retainers, but that is about it.

I'm not trying to sell you anything, just figured it would be a good opportunity to do some more informative trouble shooting to help everyone out that is currently building a car. Then again, if you don't feel like testing out another product, which may or may not solve the problem, I completely understand.

Matt