The front of the car vibrates (more like shudders) on braking even with all new or reconditioned braking components (bearings, rotors, calipers, pads, tires!) (This work was done 6 months ago - shudder has only occurred during last month). There is no vibration at the steering wheel or brake pedal. The car steers OK - no "dead-zone" or "slop" when turning the steering wheel.

Shudder seems to come from only left hand side of car. I put in a new "tie rod ball joint" on right hand side 5 years ago as its rubber had cracked. New front shockers and shocker spacers were put in 7 years ago. New bushes for "stabilizer bar" were put in 1 year ago. Shockers seem to pass the "push - release - only one bounce" test. Rest of steering and suspension bushes etc are 30 years old. Car has done 535,000 km (334,000 miles).

What is the most likely culprit? Do I need to replace all suspension bushes :(
If rubber-based components are needed is aftermarket OK or is it better to use Volvo OEM or even IPD "poly bushes"? (Been bitten on aftermarket parts - inlet & outlet manifold gaskets).