Stay dualknobs range values when they are selected using ion-range

i want to stay the dualknobs values when i selecting the range values. actually i want filters the drivers according to the price range, ratings, and vehicle . when i select all the options and find the drivers and shows the drivers list. but when i selecting again the filter option the knobs again set to initial and last position.

<ion-range dualKnobs=“true” pin=“true” [(ngModel)]=“brightness” min={{timeMin}} max={{timeMax}} step=“1” snaps=“true” (ionChange)=“setBadge(brightness)”>