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VVWC :: View topic - 74 SB leaking brake fluid
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74 SB leaking brake fluid

 
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donandrobin
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PostPosted: Sun Nov 10, 2013 12:36 pm    Post subject: 74 SB leaking brake fluid Reply with quote

My 74 fat girl is leaking brake fluid - I've checked all the wheel cylinders and they are ok.

When I'm parked, more so on a downhill slope (front of car parked facing downward), brake fluid slowly drips from the bottom of the car... so much in fact that the reservoir is empty after about 3 days. It looks like an antifreeze leak lol

It drops from the bottom center of the front beam area, so I'm not sure where it's coming from. Going to take a look at it later today/tomorrow and was hoping to find out if it's something that's common or should I just start following the brake fluid to track where it's possible coming from?

I looked under the trunk lid and there's no leaks down any of the hoses, etc, from the brake reservoir...
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Clay
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PostPosted: Sun Nov 10, 2013 5:20 pm    Post subject: Reply with quote

Sounds like a possible hole in your hard line running to the back.
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stude
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PostPosted: Mon Nov 11, 2013 9:52 am    Post subject: leak Reply with quote

that area of the firewall around the bolts for the master is double layers of sheet metal if your master is leaking out the front and into the boot it is very hard to see or feel at the pedal the master leaks into the boot then between the panels but the rubber boot would be full of brake fluid that would be one thing to check if it was a hole in the line your pedal would fade to the floor wait no that's not true on a dual circuit only on the single you have the duel the front would hold pressure.

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donandrobin
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PostPosted: Wed Nov 13, 2013 9:41 pm    Post subject: Reply with quote

Thanks for the ideas, it turned out to be the flexible rubber hoses between the master cylinder and the metal brake lines going up to the brake fluid reservoir.

They were definitely the original ones and were battered to all hell from 39 years of vibrations and exposure to the elements.

Also replaced the horn while I was at it (old one was dead) - took the "high" one from a 2000 Jetta I parted out a while ago, sounds like you would expect a bug horn to sound like. Smile
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Bow-Wow
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PostPosted: Thu Nov 14, 2013 8:56 am    Post subject: Reply with quote

You used the proper blue brake fluid hose, right? Not just fuel line, right?

http://www.cip1.ca/ProductDetails.asp?ProductCode=VHD%2DN20%2D3501
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donandrobin
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PostPosted: Thu Nov 14, 2013 4:20 pm    Post subject: Reply with quote

Ok, so if I did use fuel hose is that good or bad...lol

The brake fluid is still leaking, however now it's leaking less... the hoses definitely needed to be replaced.

It appears to be leaking between the firewall - master cylinder replacement?
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donandrobin
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PostPosted: Wed Nov 20, 2013 4:02 pm    Post subject: Reply with quote

Anybody have any thoughts on this? Is a master cylinder replacement in order?
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Bow-Wow
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PostPosted: Wed Nov 20, 2013 4:59 pm    Post subject: Reply with quote

Sounds plausible.
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haywirebutton
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PostPosted: Wed Nov 20, 2013 6:29 pm    Post subject: Reply with quote

does it fade? is it dripping out the rod end?
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donandrobin
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PostPosted: Wed Nov 20, 2013 8:52 pm    Post subject: Reply with quote

No, the brakes work perfectly for a few days, and then once the brake fluid is all drained out then the pedal just goes right to the floor.
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donandrobin
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PostPosted: Fri Dec 20, 2013 6:01 pm    Post subject: Reply with quote

An update on this one - took out the old master cylinder and it was leaking at the front where it sits in the firewall. Put one in I found in my stash of things from over the years and brakes are perfect now. Glad i replaced the blue brake lines (thanks chris) though, there were near finished.
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stude
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PostPosted: Sun Dec 22, 2013 10:06 am    Post subject: Reply with quote

Glad to hear you got it fixed I was wondering and waiting to hear if we got it done.

T
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donandrobin
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PostPosted: Sun Dec 22, 2013 10:24 am    Post subject: Reply with quote

Yep, glad it's done too. The replacement master cylinder I put in appears to have been new... what a difference when pressing the brakes! So much better!!!
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