▁is ▁also ▁used ▁to ▁improve ▁high - speed ▁stability ▁and ▁tra ction ▁during ▁low ▁speed ▁corner ing . ▁ ▁Sus p ension ▁ ▁The ▁B 4 ▁is ▁susp ended ▁on ▁the ▁same ▁platform ▁as ▁other ▁Liber ty ▁models ▁– ▁Mac Ph erson ▁str uts ▁under ▁the ▁front ▁and ▁a ▁multi - link ▁str ut ▁rear . ▁The ▁front ▁susp ension ▁incorpor ates ▁cast ▁al umin ium ▁L - sh aped ▁trans verse ▁links ▁and ▁the ▁cross ▁member ▁features ▁a ▁newly ▁de vised ▁' per formance ▁rod '. ▁The ▁performance ▁rod ▁is ▁a ▁later al ▁bra ce , ▁which ▁impro ves ▁side - axis ▁st iff ness ▁by ▁ 5 0 0 ▁percent ▁and ▁longitud inal ▁st iff ness ▁by ▁ 5 0 ▁percent . ▁This ▁provides ▁more ▁constant ▁susp ension ▁geometry ▁under ▁hard ▁corner ing . ▁The ▁rear ▁susp ension , ▁too , ▁receives ▁an ▁additional ▁support ▁sub - frame ▁to ▁improve ▁rear ▁susp ension ▁later al ▁and ▁longitud inal ▁st iff ness ▁( by ▁ 2 0 0 ▁percent ▁and ▁ 2 0 ▁percent ▁respectively ). ▁ ▁Front ▁Sus p ension ▁D amp ing ▁R ate ▁– ▁B ump / R eb ound <0x09> ( N ▁@ ▁ 0 . 3   m / s ) <0x09> 9 3 2 / 2 1 5 9 ▁Sus p ension ▁Tra vel ▁– ▁B ump / R eb ound <0x09> ( mm ) <0x09> 1 0 5 / 9 5 ▁Spring ▁R ate <0x09> ( N / mm ) <0x09> 2 5 . 1