Official: Brake Pad Knock Back Thread

[XcYZ]

Yep, they're fixed.

[Neil B]

Originally Posted by Vegas69

It just causes variations in pedal travel. On the street maybe an inch or so, on the track up to 2-3 inches I would say. It's more of a nuisance than anything. On the street it's not a huge deal, on the track, it's to much travel and causes late braking. I can see circle track racing not causing the issue an autocross would. You are loading the axle one way most of the time.

Thanks. I deleted my post because I think the PBR is technically a floating caliper and I didn't want to confuse people.

[Musclerodz]

What rear end are you running. I would not think .005 would be noticeable unless the pistons are actually moving the axle under pressure farther than you can move by hand

[Vegas69]

It's a Moser 12 bolt, True Trac, 33 spline, big ford end with roller bearings. The .005 is definitely bearing clearance. It's not enough to cause a problem in my opinion. It's the side load on the bearing causing the issue.

[eville]

I've noticed the pad knock back with my car too. It was far worst with the factory c clip 12bolt, better with the moser but still there.
It's manageable, but very annoying.

I've thought about the residual pressure valve. I was hoping 2# would be enough. I with you Todd, 10# seems excessive for pad wear and dust....

I'll be following this one.

[Vegas69]

I have to wonder how much pressure a brake booster and hydraboost puts on the system before any pressure is exerted on the pedal. There has to be a threshold amount. Maybe hydraboost will disclose it's specs in hope of a sale. They just might get it.

[Payton King]

and he stated the same to me....the 10 lbs residual valve fixed the problem.

I know some of the high end calipers have springs behind the pistons to stop the problem.

I have a therory that I have not proven as of yet. I think the lower volume of fluild used because of the smaller bore size in a manual system makes the problem more pronounced. Seems like you do not hear about it as much with a power set-up.

I am seriously considering converting to a DSE power system soon. I will let you know if my therory works out.

I did the same with the Currie plates and still have a little knock back, but not as bad as it was.