The power steering system(FLUID) improved to the EPS(electric power steering) to reduce engine lose of power by vane pump !
The power steering turning assist by the electric motor ,gear & gear will be wear and tear to be come the extra free space , The knocking noise be occurs when u crossing the bumpy and unven road .some knocking noise (KOK KOK KOK) come from LHS also some vehicle knocking noise come from steering wheel !
1)Steering Rack internal wear and tear, the knocking noise come from the extra SPACE(clearance)
2)steering intermediate shaft (coupling) wear & tear
We will repairing & set back to the spec (rack & shaft) , If out of spec the worse parts need to replace !
Need to test drive and inspect all the suspension condition before adjustment!
( 1 ) CHANGE THE NEW SET OF STEERING RACK & SHAFT ( HIGHER COST & EXPENSIVE )
( 2 ) READJUST AND REPAIRING ( NO NEED SPEND MORE TO SOLVE THE TERRIBLE NOISE )
WE ARE SPECIALIST TO SOLVE THE ESTIMA/VELLFIRE/ALPHARD problem!
we have flexible price to solve ur vehicle problem :-but need to check the parts condition 1st.
Knocking noise KOK KOK KOK -a situation when driving on the uneven road will produce KOK KOK noise, after apply brake the knocking noise will go.
The brake caliper wear and tear, caliper hole will bigger than the original size, so the clearance between the caliper pin and caliper hole is too large, knocking will occur when driving on uneven road.
Change OVERSIZE caliper pin to reduce the clearance
****Some workshops put grease in the caliper hole to refit the clearance (but after the grease is gone, the knocking noise will come back )
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