My '64 Cadillac DeVille had been sitting for awhile while I was travelling this summer and when I came home it had some issues starting. After replacing the plugs and the ignition coil, it was running better than it had in a long time but the brakes were sticking. I noticed the brake pedal was traveling a little farther than usual when slowing down. Soon after I noticed a hissing noise coming from around the brake pedal. Then I lost the brakes pretty much completely. I couldn't find any leaks from the brake lines or the master cylinder when I took a look around. Is my master cylinder the culprit, or does anybody have any ideas on what to do next? Is it possible I cracked the brake line removing the plugs?

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Comment by Tony and Ginny 429 9 hours ago
The brake peddle should be -hard as a rock at the bottom of its travel -unlike ABS brakes
I think my peddle travel is aprox about half of what yours is

Enjoy
Comment by Christopher Codd 14 hours ago

Comment by Christopher Codd 14 hours ago

You guys might be bored hearing about this project, but I'm just posting an update. Just received a fresh rebuilt booster back from Booster Steve. The one I had was not the stock one for 1964, but he had a core handy that he rebuilt for me. It's all installed and I finally have brakes again and can drive the car, but the pedal seems stiff and only has about an inch of travel it seems. I'm going to be looking for vacuum leaks tonight and see what I can find. 

Comment by Clovis on October 4, 2018 at 9:00am

It sounds like things are coming along for you Christopher. When i got my car 4 years ago i rebuilt my wheel cylinders and bought a new boster/master combo off ebay. Not the cheapest but wasnt so bad that it was prohibitive. 

Comment by Christopher Codd on October 1, 2018 at 4:22pm

Yeah, the paint laid out really nice. I had to paint the rest of the master cylinder while it was hooked up in the engine bay and it was a tight squeeze, but now I won't have to bleed the system again. 

Comment by Jason Edge on October 1, 2018 at 3:44pm

Eastwood is good paint.  I have had excellent results with their paints.

Comment by Christopher Codd on October 1, 2018 at 3:27pm

Getting antsy waiting on my brake booster to be rebuilt, so I'm replacing the power steering pump now and repainting the master cylinder with some Eastwood Brake Gray paint. The paint supposed to be resistant to brake fluid, but only time will tell. It's just gone on sale (of course right after I bought a can), so grab some while you can get it. 

Comment by Christopher Codd on September 21, 2018 at 10:32am

Jason, I can still see the old brake parts on most of the websites, but they're all out of stock. It's a real bummer. Went ahead and shipped my brake booster off to Power Brake Booster Exchange. They gave me the best quote I could find at $155.00 plus shipping. They had good reviews from other forums and their work looks top notch. I'll let you all know how it works out so anybody needing future brake booster rebuilds and wanting to keep their original parts can take their work into consideration. 

Comment by Jason Edge on August 31, 2018 at 8:52am

Hopefully it is just a busted check valve. The availability seems cyclical as Delco's are available then Bendix, and back and forth but with diminishing windows of availability. It seems they wait until they have a batch for rebuilt then become available for a short duration. The old stock to rebuild is of course becoming smaller and smaller.  I remember when replaced my brake booster/mc some years back you go on the AutoZone site and they had a plenty of rebuilt original Delco Morraines. I remember buying maybe 3 or 4, installing one and selling the others. It is one of those items where I could have bought 50 and demand would have eventually exceeded supply.  We will have to keep our eye on what is available. I do have a good stock of cores for rebuild if anyone finds a source or whats to take on rebuilding these. 

Comment by Christopher Codd on August 31, 2018 at 8:38am

Just a little update on this. It seems that nobody is selling the Delco brake booster/master cylinder anymore. I went ahead and bought the Bendix master cylinder since that was the only one I could find. Could not find a Bendix booster. I bench bled the master cylinder and installed it and the brakes are still going to the floor with the loud hissing noise coming from the brake pedal area when the brakes are pressed with the car running. I took the hose going from the booster to the carburetor off and plugged it and the noise went away. I am going to replace the check valve and if that fails, I guess I'll be sending my booster out for a rebuild. I just figured the master cylinder was the problem since the brake pedal wash mushy. Brake lines are stainless and look ok. Brake hoses to each wheel look bone dry. Guessing this is all a vacuum issue. 

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