B757 captain reported encountering wake turbulence from a preceding B757 on arrival into lax.

Attributes
ACN	1471311
Time
Date	201708
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR HLYWD 1
Flight Plan	IFR
Aircraft 2
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR HLYWD 1
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 6738
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

Clear to descend the hlywd 1 arrival. At FL280 we were hit with wake turbulence; it was brief; one thump. The aircraft in front of us was also [a] B757 at FL260 and 8 miles ahead. I asked socal [and] he told me what type and how far. I called in the back to make sure everybody was ok. [One] flight attendant bumped her shoulder. She said she was ok.

Original NASA ASRS Text

Title: B757 Captain reported encountering wake turbulence from a preceding B757 on arrival into LAX.

Narrative: Clear to descend the HLYWD 1 arrival. At FL280 we were hit with wake turbulence; it was brief; one thump. The aircraft in front of us was also [a] B757 at FL260 and 8 miles ahead. I asked SoCal [and] he told me what type and how far. I called in the back to make sure everybody was OK. [One] FA bumped her shoulder. She said she was OK.

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.