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Cadillac Repair/1988 Cadillac Eldorado

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Question
The brake fluid leak in the rear of the vehicle and emergency brake stays on. Can not find find the leak. What do I need to do?

Answer
Hello Lee,

If you can't find an obvious leak, the very first thing I would suspect would be the master cylinder leaking.
This could turn into a very expensive situation and it is pretty common. The master cylinder leaks into the power booster destroying the rubber in the diaphragm. To test this theory, remove the master from the brake booster. You don't have to disconnect the lines to do this. If you find it wet, there your problem exists!
You will need to put a new master on and get a booster from the junk yard.
I am not sure why you think the brake light is on because of the emergency brake. The light is probably on do to the fact there is a problem in the brake system.
You will need to bleed the brakes after you replace the faulty parts.
If you don't replace the vacuum booster, you can be driving down the road and find that you don't have power assist to stop the vehicle and could cause a crash. Get back to me on this. I think you will find my diagnoses accurate from your description.

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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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