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Discussion Starter · #1 ·
I have a 67 Chevelle that is basically all original to my knowledge. Last week I went to back it out of the garage and the brake pedal went to the floor. I determined the master cylinder was the problem and pulled it from the car today. I noticed sludge in the bottom of each reservoir and inside of the cylinder when I pulled it apart. I noticed the aluminum pistons were pitted maybe adding to the sludge. What I am concerned with is if this sludge is through the whole brake system. I want to flush the whole system because as far as I know this is the original brake fluid, at least from the 1970’s. I was planning on replacing the brake hoses as well. I am also concerned with are the metal brake lines. They look solid from the outside, however; I don’t know if they are corroded on the inside. Should I flush them with alcohol and blow them out or just replace them? Should I replace/rebuild the wheel cylinders even though they are not leaking? Any suggestions?

Thanks
 

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No longer and no more expensive than it is I would suggest rebuilding all 4 wheel cylinders. It has been my experience once you take the brakes apart, they are going to leak sooner or later and nothing will make you mad than getting it all back together and they leak. A ounce of prevention is worth a pound of cure IMHO.

Larry
 

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At this point, you should SERIOUSLY consider replacing all your hard brake lines - they are likely corroded on the inside also, and will rupture one of these days.

It's a little time consuming, but not difficult to swap them out.
 

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If you plan on rebuilding the wheel cylinders first take a bleeder wrench and see if you can get them to back out without breaking off. If they break off, toss them and go new. Same with your steel lines. If your budget allows, go all new hydrulic parts and make sure your hardware is safe. Unless you have a lot of free time on your hands, rebuilding master and wheel cylinders is almost a wash,cost wise. Where are you in NE PA?
 

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You will probably find the same kind of sludge inside the brake cylinders, possibly in the brake lines as well. Brake lines and cylinders are cheap. I would just replace them.
 

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Discussion Starter · #6 ·
If you plan on rebuilding the wheel cylinders first take a bleeder wrench and see if you can get them to back out without breaking off. If they break off, toss them and go new. Same with your steel lines. If your budget allows, go all new hydrulic parts and make sure your hardware is safe. Unless you have a lot of free time on your hands, rebuilding master and wheel cylinders is almost a wash,cost wise. Where are you in NE PA?

Thanks to all for the advice. I will see if I can get the bleeder valves to back out and go from there with the wheel cylinders. Plan on replacing all the lines.

Mike, I live in Mountatintop, just south of Wilkes-Barre
 

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Discussion Starter · #7 ·
Thanks to all for the advice. I will see if I can get the bleeder valves to back out and go from there with the wheel cylinders. Plan on replacing all the lines.

Mike, I live in Mountatintop, just south of Wilkes-Barre
 
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