# Ford Expedition whistle sound when braking in reverse? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** noises, expedition-el, ford\ **Created:** [October 4, 2022, 5:10pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723 "2022-10-04T17:10:42Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![davidrossauto](https://avatars.discourse-cdn.com/v4/letter/d/8797f3/32.png) [@davidrossauto](https://community.cartalk.com/u/davidrossauto)\ **Post date:** [October 4, 2022, 5:10pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723/1 "2022-10-04T17:10:42Z")
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? ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [October 4, 2022, 5:16pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723/2 "2022-10-04T17:16:46Z")
No video, no sound. Take it back brake shop that did the work. ---
**Author:** ![davidrossauto](https://avatars.discourse-cdn.com/v4/letter/d/8797f3/32.png) [@davidrossauto](https://community.cartalk.com/u/davidrossauto)\ **Post date:** [October 4, 2022, 8:18pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723/3 "2022-10-04T20:18:45Z")
Thank you, Ill try to send again. ---
**Author:** ![davidrossauto](https://avatars.discourse-cdn.com/v4/letter/d/8797f3/32.png) [@davidrossauto](https://community.cartalk.com/u/davidrossauto)\ **Post date:** [October 4, 2022, 8:19pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723/4 "2022-10-04T20:19:59Z")
Lets try this.[IMG\_3561.MOV - Google Drive](https://drive.google.com/file/d/1YWpgFzjo_79hXXArtt5HHBc9vPf9jSJ6/view?usp=sharing) ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [October 4, 2022, 9:09pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723/5 "2022-10-04T21:09:13Z")
I still have the same advice… Take it back where you got the brakes done. If you just told the shop that did the work…“put new rear brakes on, please” and nothing else, I’d suggest telling the shop you have a noise when you back up and let them do what they trained to do… diagnose car problems. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [October 4, 2022, 10:01pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723/6 "2022-10-04T22:01:24Z")
Seems most likely a sound like that would either come from the rear brakes or from the booster. Suggest to focus on determining if the sound is coming from the front of the car (where the booster it located), or from the rear, (where the brakes are located). When the rear pads were replaced, were the rear disc surfaces also cleaned and deglazed? What type of brake pad was used? ---
**Author:** ![davidrossauto](https://avatars.discourse-cdn.com/v4/letter/d/8797f3/32.png) [@davidrossauto](https://community.cartalk.com/u/davidrossauto)\ **Post date:** [October 4, 2022, 10:44pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723/7 "2022-10-04T22:44:09Z")
Just checked and it’s definitely coming from the front of the car somewheres. Thanks for your time ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [October 4, 2022, 10:51pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723/8 "2022-10-04T22:51:18Z")
There’s usually a thick-diameter rubber-looking hose that connects to the brake booster, sourced from the intake manifold. Ask your shop to take a close look at that. Might be cracking, or problem at one end or the other with the connections. Could also be ruptured diaphragm inside brake booster. That’s hidden, not obvious just by looking. Sometimes that will cause brake fluid to get sucked into the engine. Any brake fluid loss? Seeing any unusual looking smoke coming out the exhaust? ---
**Author:** ![davidrossauto](https://avatars.discourse-cdn.com/v4/letter/d/8797f3/32.png) [@davidrossauto](https://community.cartalk.com/u/davidrossauto)\ **Post date:** [October 6, 2022, 1:41pm UTC](https://community.cartalk.com/t/ford-expedition-whistle-sound-when-braking-in-reverse/186723/9 "2022-10-06T13:41:04Z")
Thanks George, will have that checked!