Hello to all, my rotors are original 92K and my pads Akebono 30K. everything seems fine in drive moving straight ahead no noises.

But yesterday out of nowhere when I place in reverse and the moment the car moves in reverse I hear a very loud high squeak or shrill. The sound seems as if it coming from all over but when it really comes down to pinpointing the noise it would seem that it is coming from just or at least mostly from the left rear wheel and just emanates the sound all over.

Any ideas as to what would cause this to happened all of a sudden?

Obviously I am in for a visit to a brake specialist but would like to know your thoughts before. I have no idea! I do not think it is a small pebble or anyhting like that rubbing against the shield.

Ps. This is not the normal brake noise when backing up that just happens, this is loud and high shrill and just started happening yesterday, I have always had a bit of "normal" noise when backing up. This is different.

Thanks for you ideas and
Happy Motoring...

 

Mine's a '99 XK8 and I had this happen once. In my case, it was the second or third day after I bought the car (used), and had set the parking brake in my sloping driveway that day.

On my next trip, I released it and drove off. I remember being unfamiliar with how to set and release the brake and may not have released it all the way, or perhaps it stuck partially engaged.

I later backed out of a parking space (level ground; parking brake not used), and there was a loud high-pitch squeal in reverse only, and sounded like the left side. I got home and tried to listen and figure it out, and didn't realize the parking brakes are drum-type and within the disk hub.

After a bit of study, I tried exercising the parking brake and it went away, never to return 15,000+ miles hence. The prior owner later told me he'd never set the parking brake before, nor heard the noise.

I've since tried to make it happen again, and I had the Jaguar dealer look it over during an oil-change visit, but all appears normal, and he'd never heard of that happening before.

Just a thought, and I assume that was my problem, so it may be something you'll want to rule out before an expensive shop visit.

 

Hoverdub (Steve) you get the prize , you are indeed correct.

I took my car in and they removed the wheel could not find anything wrong but the noise was there. I too had never particularly used the parking brake(not alot off hilly streets in the Valley of the Sun). Took off the caliper still there, tried to remove the rotor but it was stuck, had to use sledge hammer and knock it up, after some time it finally came off to reveal the inner working of the parking brake on the left rear hub, the shoes were not straight and were leaning forward thus the creating pressure against the rotor. creating the hard removal as well as the high pitched screeching noise in reverse.

There are two spring pins (see below picture) that go thru the plate of the parking brake and connect to the rear splash plate.
The one pin had been twisted and broke off the rear plate somehow and caused the shoe to be able to move forward and backward (it is not supposed to do that) only move in and out the create friction on the inside of the rotor to be a parking brake.
The picture below shows the inner working of the rotor and the parking brake. notice the small spring type pin on the top left, that is what broke and allowed the shoe to fall forward.

The brake specialist said it would cost about 600 dollars to repair or he could put a nut and bolt in the same place for free.
Nobody seemed to no why the spring pin is used and when it came loose it ripped the hole in the back plate so it would never work again (needed new rear plate 380.00).

Problem solved for a free brake inspection.
No noise in forward or reverse.

Ps. the rear hub below is what is covered with the entire rotor, then the calipers go over the the rotor, of course those that know brake will already know this but this is for those that do not. Hope this paints good enough picture that everyone understand what happened.
Thank you to "Land Auto Dismantling" for the picture!

 

Good news! Glad that my parking brake didn't get as honked up (yet). Thanks for the pic and good description!

Steve