Pic. 4.4. Low Friction Ball Joint: 1 - front upper arm; 2 - low viscosity ball joint (for front upper arm); 3 - front lower arm (ass); 4 – rotary fist; 5 - rear ball joint with low coefficient of friction (for front lower arm); 6 - low friction front ball joint (for front lower arm); 7 - front lower arm; 8 - sectional view
Low friction ball joint used on front upper and lower arm knuckle (ov), to improve steering response and smooth operation (pic. 4.4).