Steering wheel shake STILL present at 35-25mph while braking (no brake pedal pulsing)

Front supension completely rebuilt (other than sway bar end links which will be installed this week)

Brake rotors checked for warpage, no pads deposit, caliper pins lubed and move freely

Checked for bad wheel bearings

I have brake pistons seals, guides and pins waiting to be installed. Is it really possible that sticking caliper piston is causing this?

Euro, I remember you having this issue and you resolved it with caliper rebuild. I'll try to do it this weekend and post results.

1998 BMW 540i 6 speed
Arctic silver, M sport suspension (euro delivery), prod. date 05/98, non VANOS
Staggered 18" style 32 OEM wheels
3.15 open differential
Remus exhaust
AFE CAI with improved heat shield
Z3 shifter
VDO oil pressure and temperature gauges in place of headlight/fog switches
Powder coated valve covers-satin black
CDV delete
AEA DRL module (aftermarket daytime running lights)

1997 BMW 528iA
Alpine white, premium package, prod. date 04/97, single VANOS
Staggered 17" style 32 OEM wheels
AEA DRL module
Custom made sun blinds for rear seating area

2000 Nissan Frontier Desert Runner, AKA "The Work Horse"

Garage aids:
Direct Lift Pro Park 8
Campbell Hausfeld 28 gallon oil lubricated air compressor
Newair ACP-1400H portable air conditioner and heater
Auto Enginuity scan tool with BMW enhanced option
Actron 9135 scan tool-for quick readouts