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Cadillac Repair/1993 cadillac deville brake issues

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Question
when i drive my car i dont hear a noise until i push the brake pedal and i feel the brake pedal push back a semi loud bang noise then after a continuing clanking noise i guess is best way to describe it?? any ideas??

Answer
Hello Rhonda,

Unfortunately, working on the Internet and trying to answer a subjective question like this is almost impossible for me to accurately answer.

Your question does not fit into a common brake noise where I could tell you this is a brake shoe, caliper or pad problem.

In fact, except for a couple of personal experiences out of tens of thousand of cars I have worked on, I can't off the top of my head, give you a definitive answer and can only come up with some thoughts.

You did not state if this has been going on for a while, or if the problem just started.

These vehicles have anti lock brakes and for a number of years there were problems with the controller under the hood. Many of these cars used what I did not care for, which was known as hydroboost. Hydroboost was operated hydraulically through the power steering system and gives the power brake assist. Hydroboost can cause strange noises. Where as other cars used vacuum for the power brake assist.

Bottom line, these are two other systems added to your brake system that need to be considered when searching for a brake noise problem.

The anti lock system will operate when the pavement is slippery or if you slam on the brakes. You will feel the brake pedal pulsing and you may hear an accompanying noise.

The hydroboost makes the pedal feel mushy compared to vacuum operated assist. It too can cause strange noises. It can also cause the brake pedal to "pop up."

Bottom line, the best advice I can give you is to take the vehicle to a service garage (not a dealer) to have the brake system checked out. This is one of these situations that I could guess all day and still may not reach an accurate diagnoses without personally inspecting the vehicle.

Let me know what the find!

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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