Pad Knockback Issue

[Sleeper68]

You caught me lol. I was a brake system vehicle test engineer for several years at a tier 1 supplier.

Nice. I have also worked for a Tier 1 Automotive suppliers (JTEKT and MAHLE) as a co-op student. Very interesting line of work. We had a machine go down. Had trouble getting part out of it within BMW' spec. We then shutdown the BMW line and they set us a bill for $2M. Glad I'm not in that realm as a professional. I do medical devices now.

I agree with Wilwood's point that you generally shouldn't use a 10 psi RPV with discs (production cars don't use any RPVs at all), but they might get you by for awhile until you can address the root cause at the axle. I don't think there's anything "wrong" with the design of the seal grooves or calipers - no calipers are really designed to deal with the discs moving around underneath them.

The 4 psi RPV may be the sweet spot.

My hope was the floating caliper design would be enough to alleviate the knockback but it appears I am wrong. Do you think the movement of the rotor is mostly axle thrust play or axle bending moment from vertical and horizontal forces (mainly cornering)?



This car can generate about 1.1 g steady state. Rear static corner weights are about 650lb. I anticipate weight transfer at that acceleration of 350-450lb.