Official: Brake Pad Knock Back Thread

[Vegas69]

Thanks for the info. You are absolutely right, most factory setups are floating.

[Vegas69]

Ran a fast autocross this weekend and the brakes were useless. Unfortunately I'm going to have to go with a hydraboost unit since power brakes are not an option. My axles and bearing packs can't get any tighter. It's got to be fluid volume........ Wilwood really should come out with a fix for this but I'm not holding my breath.

[Silver69Camaro]

Originally Posted by Vegas69

Wilwood really should come out with a fix for this but I'm not holding my breath.

Why is it Wilwood's problem? Many people run Wilwood's with sticky tires and 9" axles without any problem at all...including myself (manual brakes or not). When I had a knockback issue, it was actually due to the front bearings.

Many floating caliper designs can suffer from this problem as well.

Did anybody try the 10lb residual with success? The 2lb valve is what most people use.

[Vegas69]

You're right, it's my problem. I just assumed spending 3k on brakes wouldn't have me chasing my tail for a year. First it started with a mis communication between Wilwood and Moser. Guess who got Wilwood to design an updated plate to fix the excessive bearing slide? I have two of them sitting on my bench for free directly from the manager at Wilwood. And they are twice as thick since one of the originals was tweaked from side force. Oh yeah, that's after I paid for a set of Currie plates and spent the money to have the bearing pressed on and off.

I'm experiencing it on the street as well. When I say street, I mean regular driving. I go around two corners and my pedal easily changes about an inch. On the autocross is goes almost to the floor. If it was a track only deal then I'd be thinking front hubs. I still think it's out back.

The 10lb residual will probably fix it but I like to take it on some long cruises. Maybe I should try some new bearing out back before I drop a fortune on a new hydraboost setup and master cylinder.

[Vegas69]

Just got off the phone with Moser. They have changed to a non rubber O ring type bearing from napa. Hmmmmmm........ No good reason was given.

[Bow Tie 67]

Originally Posted by Vegas69

Just got off the phone with Moser. They have changed to a non rubber O ring type bearing from napa. Hmmmmmm........ No good reason was given.

And this is a direct replacement for the set20 type bearing? Is it a roller or taper? Part number, pretty please?

[Bow Tie 67]

Todd heres an idea, can you adjust your rear brake bias to complete soft and drive the car to see if there is a difference. That maybe one way to confirm your problem is in the rear.

[Vegas69]

Actually thought about that. I just don't see C6 hubs having excessive deflection putting around town. I can feel no play in the front bearings. The napa number is 88128 but it's a roller.

[Silver69Camaro]

Originally Posted by Vegas69

You're right, it's my problem. I just assumed spending 3k on brakes wouldn't have me chasing my tail for a year.

Nice. That's the attitude that makes me happy to help people out.