Drop Knuckles that work with Drum-in-disc brakes

[Marphie21]

Hi there,

So I've been trying to research as much as I can about the Driftworks Geomaster knuckles. I found out that the drum-in-disc performance is gravely affected by the way you need to mount them on the Driftworks knuckles (switching the left assembly to the right side, and vise versa). This is quite disappointing.

Now, I'm looking for:

a) Other drop knuckles that are sure to work with the z32/ skyline drum-in-disc set up

b) A way to mount the rear drum brakes properly so that it doesnt affect the awesome performance of the drum brakes

Seems like its an issue that has affected quite a few people and I wanted to try to consolidate the solutions and alternatives in this thread

[brndck]

the newest gen PBM knuckles are supposed to work with z32 drum ebrake. I believe the GKTech ones do as well (but I don't recommend the gktech, we had quite a few issues with the sets we ordered)

https://store.partsshopmax.com/shop/silvia/MultilinkSteering/RKNUC.html

"One piece dual caliper drop knuckles We maintained these features from our famous multipiece drop knuckles: ~ TRUE 25mm drop (distance between upper and lower mount points has not changed to create a fake drop at the coilover) ~ Corrects roll center on slammed cars ~ Reduced camber gain on compression to maintain traction and even tire wear ~ Low torque teflon lined maintenance free spherical bearings ~ Maintains OEM toe out / traction increase upon compression ~ or ~ *Pair with the LimitBreak Toe Control Bracket for zero toe change or toe in. We combined all of the brake mounting options into one structure now so you just cut off the one you done need, plus For 2016 we added Z32 parking brake support. ~ Dual Z32 caliper, drum parking brake, and Z32 disc support *cut off wilwood mount ~ Wilwood hand brake caliper / OEM S chassis foot brake caliper with parking brake / OEM disc support *cut off Z caliper mount ~ Optional Wilwood dynapro billet dual piston hand brake caliper part#120-9689 & 150-9765k runs $260/set. *Pair this with the MAX hand brake with independent Wilwood master and reservoir. *Conforms to Formula D rules for suspension and independent secondary brake system *Compatible with all OEM and aftermarket arms, rods and coilovers however the MAX 2015+ RUCA is needed when using larger than original CV axle joints."

[Marphie21]

Thanks for the info!

I just have a question about the PSM rear knuckles-- it states that it has a TRUE 25mm drop. Driftworks claims ~50mm of correction on their rear knuckles. Do they measure the amount of roll center correction differently?

PSM mentions "Fake drop at coilover", is this referring to the driftworks design? (Doesnt driftworks just make the hub higher?)

Sorry if Im lacking some knowledge on roll center/ geometry concepts, but which one has more effective roll center correction?