vaccum leak possibly
there is a little metal plate that scrapes the rotor to warn you when your pads are getting too warn down True, if you have rear disc brakes. But if, like most cars built before 2000 and many cars built since, you have rear drum brakes, you probably have a loose spring or something of the like. Drum brakes have springs and cables to hold the shoes in position. If a spring snaps, the shoes will be off center in the drum, causing a grinding sound. They may still work like always. Also important is that rear brakes do only 25% of the work. It's possible that the shoes need to be replaced and the drums turned or replaced even if you are able to stop with no problem. Ignoring a problem with brakes will end up costing a whole lot more money in the long run.
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Yes, the sound like the light is refracted and distorted. just like the broken spoon in a glass of water, sound waves under water are broken. Sound traveling from the air to the water are bent and scrambled, but lets say that the spoon was completely in the water, then it appear perfectly normal. so if the sound originated from the water then it would remain undistorted.
By the hissing noise it sounds like you need a new brake booster
Well usually a high pitched crashing sound like glass breaking
Could be the brakes are metal to metal.
Sounds like you need to replace your brakes very soon. You may need to replace hubs as well.
It's hard to diagnose without hearing the noise, but if you're sure that it is not the brakes, it could be dirt/sand/rock in the brakes. If you're hearing the sound all the time (even when not applying the brakes), it could be wheel bearings.
May be frozen brake calipersMay be rear brakes are not adjusted properlyMay be parking brake cables frozen and are dragging
You may need to check your brakes or the rollers on your brakes
you need brake pads
Sounds like it could be a frozen caliper or mis-adjusted brake shoes
Sounds like dry wheel bearings. When they sound like a giant gritting his teeth they're done for.
Worn bearings, loose rotor, warped brake rotor, sticking brakes.
sound to me like you have air in your brake lines try bleeding your brakes
The power brakes on most vehicles operate on the engine vacuum. If there is a leak or problems with the power brakes it can make a hissing sound. But then, sometimes power brakes do that when they're working properly. It could be from either a hole in the diaphragm of the brake booster or normal operation. If the sound is new, and was not there before, and your brake pedal is going to the floor, then you should have the power booster replaced.
brake booster could be bad the seal around the rod that hooks to the brake pedal is leaking