flywheel replaced now ABS playing up

Dont think it could be related but just had a new dua mass flywheel fitted and now when brakeing, just as you are about to come to a complete stop the ABS give 1 jolt through the brake pedal. No warning lights, otherwise ABS seems to be working fine, HDC working normally.
any ideas ?
Aussie

Left side brake caliper has probably been removed to assist drive shaft removal prior to gearbox removal for flywheel changeover. Check torque on caliper bolts. If the caliper is even slightly loose it could cause the jolt which you describe. Also check all left side ball joint/steering fixing bolts for tightness. D..

Had that problem with a citroen a few years ago turned out to be a damged Reluctor Ring the notches on the drive shaft that abs sensor monitors.No comments pls it was the wifes

thanks guys, I'll check these things

caliper tight. ABS is causing the pedal to pulse once when nearly stoped ??

what is the speedo reading when it happens ? does the ecu think the vehicle is going faster than it actually is, so when the abs sensor reports wheel nearly stopped, the ecu thinks you are skidding so pulses the brakes momentarily, but it won't pulse them when you are stationary.

just a thought, maybe the speed transducer dislodged / damaged in some way

Good Luck

OP the speedo is less than 10kmh and the ABS pulses 1-4 times

bump