How can I get the brakes to stop squealing?

Yes, you can spray WD-40 on your brakes to stop them squealing, although there are far easier ways to commit suicide.

Perhaps you could replace your seat-belts with tissue paper too?

NO to the WD-40!

Apply anti squeal compound to the backside of the brake pads.

STOP!!!!!!!!!!! Never spray your brakes with wd40..Wd40 is an oil based product and your brakes will be useless.
The reason your brakes are making a noise they need replaced. Most likely your rotors ill need to be replaced too as you have used them up to the rivets on the brake pads. Best of luck and take it to a qualified Mechanic

No, DUMMY! You DO NOT put lubricant on brakes. If it's making noise, take the car to a REAL mechanic and find out why.

newly installed brakes will squeak for awhile until the 'seat' with the other new parts ...................

Spraying any kind of lubricant will stop you're breaks from working properly. By what you said it's time for new rotors and pads. I would get them changed before you have a more serious issue. There is no way to get them to safely stop squeaking other than a break job.

A disc brake pad¹ has a small metal "tang" (or "tab") on it that will touch the rotor when about 3/4 of the friction material is worn off by normal brake usage.

When it touches the rotor, it makes an irritating, squeaking sound. It's a safety warning. So it's time to get your brakes checked and the pads changed.

Please do NOT spray WD-40 on your brakes!!

When I started repairing cars, disc brakes were just becoming popular in the USA. I took a class given by Bendix Corp. and they told us to replace the disc brake pads when the friction material was half worn away. You will see a line printed on the side of the friction material on a new disc pad at the half thickness area. It was explained that if you wear the pads more than that, the caliper piston(s) will extend too far (relating to mechanical leverage).


¹ One of each pair of disc pads has the "squeaker" attached.

p.s. Are all you mechanics sleeping today?

GASP! Don't ever spray any type of lubricant on brake pads because it might cause the brakes to fail. However, certain parts of brakes can be lightly lubricated (with grease that is made to stay on the part, rather than WD-40 which is usually only a temporary fix). The brake parts that should be lubricated are the ones that slide against other parts.///////Disk brakes have warning squeakers that make a noise when brake pads get too low and need replacement. If those are causing the squeak (or squeal), buy new brake pads.

Noisy brakes are usually due to cheap hard brake pads or if the rotors were not replaced with the new brake pads when installed.
You're out of your mind if you think spraying WD-40 on any brake parts is a good idea!
Many people that don't brake hard and just coast up to stop signs and apply the brakes lightly cause a glaze to not burn off the rotors which also causes brake noise. Do a couple of fast stops from 55 mph and see if that helps.

When you have pads replaced, make sure the shop uses all new hardware and puts anti-squeal compound on back of new pads.

Time to replace - no use fooling-around with old pads with that many miles. Depends on your climate and how you drive, but I usually have front pads replaced at 70,000 miles and don't need a complete "brake job" - - but you may also need to replace/resurface rotors and replace/rebuild calipers depending on their condition. I've never had to redo rear brakes and normally put 150,000+ miles on a car.

Squealing is usually telling you time for new brake pads. Now if the car sat for extended periods it could be rust build up on rotors, but that will go away pretty fast.
From what you say with 90k on them it is time for new brakes. If you keep driving with that squeal it will cost more since it will gouge or scour the rotors.

Most likely the disc pads are warn out, you do not tell us the years and kilometres .

Drum brakes. Putting a heavy rubber band or spring around the drum often does it. To absorb vibration. Disk brakes are held in place by slight vacuum on some vehicles. Air or dry clean the dirt out of them sometimes helps.

That "squealing" noise you're hearing is likely the "Squeak Bar" on the drake caliper area that indicates the brake pad is worn down far enough that the brake pad needs to be replaced. It's just a small piece of metal bent in such a way that it makes contact with the caliper when you apply the brakes, and "squeals" so you're aware of the need to replace the brake pads.

Take the car out on the road and do a few crash stops from 60mph. I will remove the glaze from the pads and shoes. Don't forget to check the mirror before you slam the brakes on.
NEVER put anything on pads or shoes.

Take it to your local dealer and have them examine your brakes. This way you will speak with the experts on YOUR vehicle and will get a specific solution for it.

What is the year, make and model of your car? What brand and type of brake pads are on the car? For the most part, always use the brake pads from the dealer and *anti-vibration shims which reduce or stop brake squeal offered with these pads. Never ever spray oil based WD-40 on brake pads. Nowadays pads from the dealer of the car are ceramic with anti-vibration shims which stop brake squeal *from the minute the pads and shims are installed.

No

Find out why they're squealing first. They may require servicing.

Please do so at your earliest convenience

Two possible faults:

Your brakes are catching/releasing. Because either your drums are not round or your disks are not flat. Any decent Brake Shop will correct your problem.

Your shoes/pads are worn out and you are grinding the drums/disks with metal to metal. Keep using and you'll need new drums/disks.

Yea I would say WD40.

new brakes will squeak for some time give it time.

Squeeling is just what happens with some cars. Dont use wd40 that is a parts cleaner which happens to gum up over time.

Just drive it, dude.