Classic/Antique Car Repair/1956 Cadillac Brakes

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Expert: - 3/1/2009


Question
When I press the pedal down it does not release to the top all the way, Does that sound like the master or the booster? Could it be bleeding or adjusting? Ive done it all to no avail.. Any clues...

Answer
Hi Jeff:
On a 56 Caddy, the master cylinder and brake release works from a vacuum from the engine. If the engine is losing compression, it won't release the pedal complete. A lost of vacuum compression could be your problem. This is usually cause from something as simple as a faulty radiator cap or as major as head gaskets.

Try two things...

1. Check the vacuum hose from the engine to the master cylinder and if no leaks or obstructions, replace the radiator cap. Otherwise replace the vacuum hose.

2. If the above does not fix the problem, you most likely have a bad booster or master cylinder, but you should get a brake light warning when you apply the brake. If not, the brake pedal linkage could be sticking. A little silicone spray may fix that.

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Vern Bullock

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Visit my website at: http://www.classytransportation.com/ I can answer most questions about autos built in the 60's 70's and 80's. Specifically, Lincolns, Rolls Royces and the Excaliburs. Mechanical issues and technical questions are my expertise. I also have a general knowledge of most older automobiles. Keep in mind, I can only provide answers if the questions are very specific and complete. Without details, I can only speculate and that's not good for solving your problem.

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I have owned and maintained Silver Shadows for over 10 years now. I find most mechanics and even Rolls Royce mechanics have very little knowledge about these automobiles. I have researched these cars in quite a bit of detail and can pretty much tell you what is wrong, if you can describe the behavior in detail. I have saved quite a few RR owners a lot of money and aggravation due to improper diagnosis. I am the owner of Classy Transportation, LLC a luxury limousine service specializing in antique cars, classic cars, vintage cars and exotic cars.

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