whistle type sound when applying brakes in reverse ?

[davidrossauto]

Thanks in advance for any help.

I recently had my brake pads replaced thinking the whistle sound was coming from worn out pads. Not the case. It mostly happens when I apply pressure to the brakes in reverse gear.

I included a video of the sound. Brake fluid level is fine.

Could it be brake booster? Brakes? Some kind of leak?

 

[Yupster Dog]

Year Trim Engine?
Where is noise coming from?
parking brakes?

Welcome to the forum.