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Discussion Starter #1
The other day I was driving my Cadillac, when I discovered, the brake pedal felt like I was trying to push down on a rock... I have to apply 50 times the normal amount of pressure in order to stop my vehicle. I am assuming it has something to do with the power brake booster. Could someone give me some ideas on how to diagnose this problem and/or any quick and easy sloutions? Thanks
 

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1968 Cadillac Sedan deVille, 1994 Chevrolet G20
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Check to make sure that it is still getting vacuum. While the car is running, pull off the connector plugged into the brake booster on the firewall. make sure that there is strong vacuum at the check valve at the end of the hose.
 

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It's possible, but those systems are kind of rare. I'm not exactly sure if your car has one though. Do you see the large round booster behind the master cylinder?
 

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Discussion Starter #5
That's what threw me for a loop... there is no big round booster attaching to the firewall like I have seen in so many other cars. I wish mine was a 68 it would be fixed all ready.
 

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Hmm. given that i do not know specifically what your car has, I DO know that GM used 2 other braking systems, electric and Hydra-boost. Out of those two, you likely would have the Hydra-boost, which uses hydraluic pressure from the power steering pump to provide braking assist. Look for hydraluic lines that are noticably larger than brake lines running by the master cylinder. This system is generally used on vans and other vehicles where space is a concern. The other is electric. This system was used on vehicles that do not have vacuum of any sort, namely turbo Buicks. There may be a third possibility, and that is the Bosch system. I do not know a thing about this setup, except it has very weird service procedures and is extremely picky about them. Maybe someone else can chime in?
 

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