I HAD THE SAME ISSUE ON MY 1999, IT WAS THE SEAL IN THE BRAKE BOOSTER AND YOU MIGHT AS WELL START LOOKING TO HAVE IT REPLACED NOW. EVENTUALLY THE SEAL WILL GIVE COMPLETELY AND BRAKING WILL BE VERY HARD. IF YOU ARE HANDY UNDER THE HOOD YOU CAN TRY IT YOURSELF BUT YOU HAVE TO REMOVE A LOT OF COMPONENTS JUST TO BE ABLE TO ACCESS THE BOOSTER. VERY TIME CONSUMING.
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What kind of clicking noise do you expect to hear? Applying the main brakes is usually a silent activity.
If you are referring to the emergency brake, it is the clicking of the ratchet when applying the emergency brake. The clicking is the sound of spring loaded metal teeth bouncing along a cog wheel. The action is similar to the teeth on a hand winch that does not allow backward turning. If when applying the emergency brake the sound is not heard then the spring may be broken or dislodged.
Does the brake engage? Does the handle stay pulled until the brake is released? If not then the locking of the brake is not happening.
A grinding or rumbling noise can also be symptoms of a wheel bearing or constant velocity joint in a driveshaft. A worn wheel bearing can also cause a 'whistling' sound (as can a worn CV joint).
A grinding noise with brakes is either worn pads causing metal to metal contact on the brake disk/rotor, or the brake backing plate catching on a spinning rotor ... or a loose/missing anti squeal brake shim (they stop the pads from rattling and vibrating).
However, as you say a mechanic has looked at the brakes and can't find anything wrong .. I think I would begin to suspect a wheel bearing or constant velocity joint on the driveshaft (front wheel drive cars).
As with all unusable vehicle noise complaints it is important that the noise be listened to first hand, so have a shop test drive this with you on board to point out the noise to them when you hear it start in your vehicle
I appreciate you adding me to your list of contacts and asking me to help you with your problem.
However, I don't know if I can be much help from here. Noises can be very difficult to diagnose when you actually have the vehicle in front of you. All I can tell you for sure is that the noise you are hearing is not normal and if it happens only when you apply the brakes, then it is most definately brake-related. I have had some vehicles making noised as you described because of broken brake hardware. I have had some with similar customer complaints that have had loose or missing caliper mounting pins. Then I have had some that the problem was not the brakes at all, but rather lower control arm bushings that were coming apart and applying the brake was making the entire front suspension shift and make a loud popping noise. My professional advice is to take it by a professional auto repair shop and have one of the technicians drive the vehicle. They may be able to give you some idea of what is going on just by hearing and/or "feeling" the noise themseves. Then again, they may tell you that the wheels need to be removed for a full brake and suspension inspection before they can tell you anything.
I wish I had a more "cut-and-dry" answer for you, but I am afraid that is pretty much impossible at this point.
this could be an air leak in a hose,,,have a friend hold the brakes on and stick your head under the hood,,with the engine running press the brake on,,you may here the whistling and fine were its coming from i its a leaky hose fix it fast before you loos your brakes
It sound like you alt belt may be loose, the reason I say this is you stated when your engine is started cold it make this noise and then quits.when you start your car your useing battery voltage and when you car is started your alt is working its **** off to replace the amps and voltage it use to start, when its replace its not working as hard,Thanks And I hope this helps you
Actually - I had the same problem and replaced my brakes 4 times in a year. YES 4 TIMES because of the whistling. I switched from metallic to ceramic pads and works like a charm! Ceramic will not allow the noise, plus I have found to have much better control over braking and short distances.