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Old Apr 16, 2022 | 07:41 AM
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Hard brake lines

Does anyone know the thread size for the hard brake lines going into the master cylinder? 1979 F150. My rear hard line decided to crack and leak fluid all over my driveway.
 
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Old Apr 16, 2022 | 07:47 AM
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https://www.rockauto.com/en/moreinfo...=1836&jsn=1671
9/16 -18
7/16 -24
 
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Old Apr 16, 2022 | 08:19 AM
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thanks for the quick response. I'm guessing the secondary port is the one for the rear brakes. The more I'm thinking about it, I think I'll get a roll of 3/16" NiCopp and bend my own lines.
Amazon Amazon

Does anyone know if the NiCopp lines are soft enough to bend with one of these cheaper flare tools
Amazon Amazon

or will I need to get the more expensive eastman style flare tool?
 
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Old Apr 16, 2022 | 09:36 AM
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Most of the time the best way is to remove your old line and measure it. then go to your local parts house and get the closest length steel line . bend it as close to correct as possible and it's done right. you won't need a flaring tool or anything special.

If you want a nice factory bent look get a set from fine Lines or one of the other pre-bent outfits that's the ultimate fix.
 
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Old Apr 16, 2022 | 10:20 AM
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I have used Inline tube and Classic a couple of times with good results. Prices are not that bad considering what you get with a complete kit. As opposed to 8 or 9 trips to the parts store. I can bend and flare tubing and do one off's on occasion. 1 short line is ok from parts store, full length is best left to the pre bent suppliers.
 
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Old Apr 16, 2022 | 12:06 PM
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Originally Posted by 440 sixpack
Most of the time the best way is to remove your old line and measure it. then go to your local parts house and get the closest length steel line . bend it as close to correct as possible and it's done right. you won't need a flaring tool or anything special.

If you want a nice factory bent look get a set from fine Lines or one of the other pre-bent outfits that's the ultimate fix.
I’m just worried that the auto store won’t have the correct fittings or flares if there are different fittings at different points on these cars. Probably safest to just bend my own and flare them too to get the correct combos, even if I use the existing fittings. This would save multiple trips to the store.
 
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Old Apr 16, 2022 | 12:28 PM
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Nicop bends pretty easy by hand you should be fine with a cheap bender. Look in to a straightener too if you want it to look real slick, can also make one.
I see you were talking a bout a flare tool, that’s the make or break, I’d go for a decent one.
 
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Old Apr 16, 2022 | 02:05 PM
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There is nothing wrong with getting a roll of cooper - nickle line and using that flaring tool.
It looks to be the same flaring tool I have and I have had it since the late 70's just make sure you put the fitting on before you flare the line at both ends.
They say the co-ni line is softer than the old steel lines we got back in the day so flaring & bending should not be an issue.

I believe you can get the fittings at parts stores if you cant reuse the old ones.
I would try a NAPA for the fittings before the others but thats me.

BTW if 1 line blew out then the others cant be far behind and should be replaced.
If doing all the steel lines I would also replace the 3 rubber hoses (on a 2wd truck) as they go bad from the inside out if not cracking on the outside.
Dave ----
 
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Old Apr 16, 2022 | 03:55 PM
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Originally Posted by FuzzFace2
There is nothing wrong with getting a roll of cooper - nickle line and using that flaring tool.
It looks to be the same flaring tool I have and I have had it since the late 70's just make sure you put the fitting on before you flare the line at both ends.
They say the co-ni line is softer than the old steel lines we got back in the day so flaring & bending should not be an issue.

I believe you can get the fittings at parts stores if you cant reuse the old ones.
I would try a NAPA for the fittings before the others but thats me.

BTW if 1 line blew out then the others cant be far behind and should be replaced.
If doing all the steel lines I would also replace the 3 rubber hoses (on a 2wd truck) as they go bad from the inside out if not cracking on the outside.
Dave ----
slippery slope, right? you repair one thing and while you’re there….
I’ll play around with the NiCopp but have a feeling that all the hard lines are getting replaced. The lines coming out of the MC go to a valve before heading back to the rears, right?
 
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Old Apr 16, 2022 | 05:11 PM
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Originally Posted by egchewy
slippery slope, right? you repair one thing and while you’re there….
I’ll play around with the NiCopp but have a feeling that all the hard lines are getting replaced. The lines coming out of the MC go to a valve before heading back to the rears, right?
Yea I was thinking of that "slope" as I was typing and was like where do you stop
All you have left are the wheel cyl's and / or calipers, new pads & shoes and the brake system is new and good for the life of the truck LOL.

The lines from the master to that valve should also go to the front along with the rear.
That valve should have a wire(s) on it. When the rear system leaked and the pedal went to the floor that valve should have moved and set a light off on the dash.
So its master to valve to the front & master to the valve to the rear.
Dave ----

psI forgot the master for anew system
 
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Old Apr 16, 2022 | 05:34 PM
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I need to make sure that this car is working mechanically before I start worrying about the electrical stuff. So far I have at least three different fluids leaking on my driveway.
 
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Old Apr 16, 2022 | 05:40 PM
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Originally Posted by egchewy
So far I have at least three different fluids leaking on my driveway.
I bet you haven't included sweat and tears.
 
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Old Apr 16, 2022 | 05:44 PM
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Originally Posted by john jamieson
I bet you haven't included sweat and tears.

Dave ----
 
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Old Apr 16, 2022 | 07:25 PM
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Originally Posted by john jamieson
I bet you haven't included sweat and tears.
and blood…so 6 different fluids
 
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