Dash 8 captain reported encountering wake turbulence on approach to ewr in trail of a B757.

Attributes
ACN	1482835
Time
Date	201709
Local Time Of Day	0601-1200
Place
Locale Reference	EWR.Airport
State Reference	NJ
Environment
Light	Daylight
Aircraft 1
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

On approach to runway 4R at ewr; we were level at 3000 ft and had been cleared for the ILS to 4L. We had intercepted the localizer and were maintaining an assigned speed of 170 kts. A 757 had been vectored ahead of us on the approach; and was approximately 5 nm ahead and 400 ft higher than us. We remarked that a larger aircraft ahead and above us presented a significant risk of encountering wake turbulence and that typically ATC would not put us in such a position. We began to feel a few bumps and I disconnected the autopilot. Seconds later; we were rolled suddenly to the left by wake turbulence. I leveled the wings and we requested a sidestep to runway 4L to avoid further turbulence. We landed without further incident on 4L.

Original NASA ASRS Text

Title: Dash 8 Captain reported encountering wake turbulence on approach to EWR in trail of a B757.

Narrative: On approach to runway 4R at EWR; we were level at 3000 ft and had been cleared for the ILS to 4L. We had intercepted the localizer and were maintaining an assigned speed of 170 kts. A 757 had been vectored ahead of us on the approach; and was approximately 5 nm ahead and 400 ft higher than us. We remarked that a larger aircraft ahead and above us presented a significant risk of encountering wake turbulence and that typically ATC would not put us in such a position. We began to feel a few bumps and I disconnected the autopilot. Seconds later; we were rolled suddenly to the left by wake turbulence. I leveled the wings and we requested a sidestep to runway 4L to avoid further turbulence. We landed without further incident on 4L.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.