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Old 01-29-2009, 05:23 PM
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Problem with my brakes

I have a '67 Chevy full size wagon. All of a sudden the dash light started coming on when using the brakes. The peddle would go to the floor but they did work when pushing harder on the peddle. First thought was to put in a new power buster and master cylinder. That did not help, so I turned all the drums and installed new shoes (none of the wheel cyliders were leaking so I did not change them). That did not help either. My next step was to put a vacuum gage onto one of the hose fittings at the booster. The motor is well worn, but I still got 23 inches at an idle. I am sure that should be good enough. Could flushing all of the old fluid out be my next step? There is no proportioning valve being all drums. I can still lock up the brakes from 30-50 mph with a lot of extra leg effort, but I would like to have them working properly. And my wife refuses to use the car until it gets fixed. So she is using our crew cab dully at 6 miles per gallon until then. If I can fix the problem, I could save a lot of money on gas, not to mention the worries about loosing the fenders on my truck.

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Old 01-29-2009, 05:43 PM
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IS there fluid missing. On a vehicle that old I would look for a blown line or a leaking cylinder if the master is low or empty. Be prepared if you have a rotted line, usually if one blows the rest will be right behind it.
If the fluid is still good, the first thing to look at might be adjustment.
Check the master cylinder for fluid and get back to us
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Old 01-29-2009, 05:58 PM
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There are no leaks that I can find (The master cylinder is still full). And I could hear a slight brushing of the breakes as the wheels were turned at the time of installing the new shoes. My other thought is the new power booster my have been bad out of the box.
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Old 01-29-2009, 08:06 PM
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u did bleed the lines? u must have an air leak. somewhere there is a hole covered by rust on the line.check the high spots as the fuild will run to the lowest, it might not be much. or a rubber line has failed. if u cant fix it take it to a garage.
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Old 01-30-2009, 02:04 PM
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Quote:
Originally Posted by maddogmodl
There are no leaks that I can find (The master cylinder is still full). And I could hear a slight brushing of the breakes as the wheels were turned at the time of installing the new shoes. My other thought is the new power booster my have been bad out of the box.
Why did you cahnge the booster in teh first place.
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Old 01-30-2009, 02:11 PM
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Check the 3 rubber hoses that go to the front wheels and rear end.....Chances are one or all are giving out.....expanding when they shouldn't be. If they are that old (67), I would replace them all anyways.
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Old 01-30-2009, 03:50 PM
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not a criticism at all,,,,
but based on what you have posted my best advice honestly is take it to a brakes shop!!!!
throwing parts at a brakes problem and "hoping" it fixes the problem is not wise!!!
at least find someone local who has experience to guide you thru the whole brakes system testing and diagnosis!!!

if ya gotta do it yourself:
scroll down to the brakes section (and then sub sections) on this link and read carefully:

http://www.aa1car.com/carleyware/library.htm

my $.02:
your way way past living on borrowed time!!!

you should replace all the steel lines (they rust from the inside out and give no warning) and the hoses...
check the backing plates for wear where they contact the shoes....
have the drums measured to know they are within shoes allowed diameter spec...
replace all the small inexpensive hardware,,,cylinders/springs/adjusters/etc....
(basically all new everything is best)

the bent fender is a $300 irration,,,it's the $3,000 hospital bill that hurts!!!
when very roughly $300-$400 worth of new hardware would have prevented the accident!!!
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Old 01-30-2009, 04:41 PM
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if no leaks and well bled and new fluid
you said you chaged the booster and master cyl?
did you bench bleed the master cyl?
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Old 02-04-2009, 09:55 PM
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To the person asking why I changed the booster in the first place, it was because a brake shop told me that was the problem with the hard peddle. He told me if I pluged the vacuum line to the booster and the peddle was the same, that would be the problem.

I would like to thank everyone for your help and seggestions. It was a need for better bleeding. I had no help at the time, so I used a vacuum system. Now that I used some help, I did it the old tried and true (3 pumps and bleed) way. Now I can send everything from the rear of the wagon through the windshield with a light tap.
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