Wilwood Pad Knockback

[Vegas69]

I went through this 4-5 years ago. I got moser and wilwood on the same page and wilwood redesigned their retainer. It's plenty thick these days. Besides, I had the full circumfrance retainer from currie and it didn't make a difference. Went to a tapered bearing, 2 psi residual, shimmed the bearing races, 1" master cylinder and who knows what else. A floating caliper was the only solution. I believe it was a d154. Never a problem after anywhere.

[67Rally]

Originally Posted by Vegas69

I went through this 4-5 years ago. I got moser and wilwood on the same page and wilwood redesigned their retainer. It's plenty thick these days. Besides, I had the full circumfrance retainer from currie and it didn't make a difference. Went to a tapered bearing, 2 psi residual, shimmed the bearing races, 1" master cylinder and who knows what else. A floating caliper was the only solution. I believe it was a d154. Never a problem after anywhere.

Thanks Todd. I found one of your old threads (can't remember if it was here or on pro-touring), but didn't see a resolution to the knockback.

Do you still have the 2psi residual valve on there? What about the 1" bore MC? Just curious if it was strictly the Wilwood floating calipers that resolved your problem, or a combination all the fixes.

[Vegas69]

The solution is definitely in my thread but good luck finding it... ha

Everything diminished the amount of knockback except for the 2 psi residual valve which did nothing. My opinion is that the D154 floating caliper is the best solution to knockback on anything except for a car that is going to be raced 10/10ths. If you look at a majority of rear wheel drive factory cars, they have a floating caliper. The only time you see a fixed caliper is in a bearing pack situatioin like a corvette. There is a reason for that. Even with a traditional front hub, it can cause problems if things aren't in perfect working order. Wilwood has a solution for you. They used to advertise it.

[67Rally]

Originally Posted by Vegas69

The solution is definitely in my thread but good luck finding it... ha

Everything diminished the amount of knockback except for the 2 psi residual valve which did nothing. My opinion is that the D154 floating caliper is the best solution to knockback on anything except for a car that is going to be raced 10/10ths. If you look at a majority of rear wheel drive factory cars, they have a floating caliper. The only time you see a fixed caliper is in a bearing pack situatioin like a corvette. There is a reason for that. Even with a traditional front hub, it can cause problems if things aren't in perfect working order. Wilwood has a solution for you. They used to advertise it.

Found it here, only 2000+ posts into your thread: https://lateral-g.net/forums/show...ing#post356326

Wilwood does sell the full d154 floating caliper kit with internal parking brake now. I'll probably buy the whole new assembly and then sell off what I have as a full rear brake assembly rather than buying new brackets and the floating calipers and trying to sell off the fixed Dynapros by themselves.

I still need to rule out front knockback first, just to be sure.

[sik68]

For what it's worth, I installed thicker c-clips that took out nearly ALL end play of my axles...barely able to slip into the axle groove. You can search for the corner carvers thread for the guy that sells em. Here is the email address fyi:

[email protected]

I can say that I put a residual valve AND return springs behind the caliper pistons and neither seemed to help knockback one bit.

My car is still being put together so I can't tell you whether the thicker c-clips have reduced knockback. I have C5 corvette floating calipers.

[67Rally]

Originally Posted by sik68

For what it's worth, I installed thicker c-clips that took out nearly ALL end play of my axles...barely able to slip into the axle groove. You can search for the corner carvers thread for the guy that sells em. Here is the email address fyi:

[email protected]

I can say that I put a residual valve AND return springs behind the caliper pistons and neither seemed to help knockback one bit.

My car is still being put together so I can't tell you whether the thicker c-clips have reduced knockback. I have C5 corvette floating calipers.

Thanks. I don't have c-clips any more. I had knockback on the street with my 12 bolt/c-clip setup. When I switched to the Strange S60 with tapered bearings, it eliminated the knockback on the street altogether. The only way I can get knockback on the street now is if I hit a rotary at 50 and the exit at a hard 90 doing the same speed, and it's still not as bad as during AutoX.

[Vegas69]

Originally Posted by 67Rally

Found it here, only 2000+ posts into your thread: https://lateral-g.net/forums/show...ing#post356326

Wilwood does sell the full d154 floating caliper kit with internal parking brake now. I'll probably buy the whole new assembly and then sell off what I have as a full rear brake assembly rather than buying new brackets and the floating calipers and trying to sell off the fixed Dynapros by themselves.

I still need to rule out front knockback first, just to be sure.

I agree, if you have an emergency brake, autocross it and coast to a stop and see which pads are separated from the rotors.

[67Rally]

Originally Posted by Vegas69

I agree, if you have an emergency brake, autocross it and coast to a stop and see which pads are separated from the rotors.

I just need to find an empty parking lot on a weekend to simulate an AutoX. I live in Boston, and for some reason the cops frown in driving like a maniac even when no one else is around.

All front end components (brakes, hubs, bearings, spindles, etc.) are relatively new with less than 4,000 miles on them. Front wheels spin freely with no bearing sounds, so is be surprised if there's an issue there.

[Coursey]

Was you able to resolve the issue?

I am getting ready to order a new frame, which will have a 9" rear. I want to make sure i get the correct setup to not have this issue. Really doe want to order a full floater since it adds $3000 to the build. But i may have to.