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Old 05-16-2009, 11:44 PM
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discs on a 67 from a 72 - different lines?

I grabbed a full kit from a 72 camino. It's an original set-up with booster, master, prop valve, spindles, calipers, rotors ....

I have the spindles and rotors on but i was looking at my lines that will go into my proportioning valve and it looks like they may be different sizes?

I have been searching the internet for a week now about this issue and have not found my answer ....

I want the car driving again tomorrow so please send me any info you have. I am willing to buy and make some brake lines if need be but i don't know what sizes these are or anything.

Any links to tech info on this?

are there adapters i can use maybe? i dunno ...


just need a 72 proportioning valve to work with my 67 factory brake lines ....

Thanks !

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Old 05-16-2009, 11:50 PM
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front lines will be 3/16" regardless if drum or disc.

you have a disc prop valve from the donor vehicle which is good and needed to do this conversion,

and you will probably need to run the front lines differently, thats all.

use whatever 3/16" tube nuts fit the ports in the prop valve, used or new, whatever you have or can find.

its not really a big deal.

some prop valves have two front separate front line ports- one for each caliper,

and then others only have one- and in which case there will be a line T in the front line on the crossmember to split and serve both calipers

depends on the year make model


good luck

Last edited by fast68; 05-18-2009 at 04:59 PM.
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Old 05-17-2009, 12:58 AM
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thanks

my valve has 2 seperate lines for each front.

the fittings on the car are larger then what comes into the proportioning valve.

Was i supposed to buy all new lines too? Or can i just cut my lines on the car and just install the smaller fittings?

i am assuming the sizes range from 3/16 1/2 and 5/16

is this a normal flare or a double flare?

thanks
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Old 05-17-2009, 01:31 AM
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Double flare, the fitting has to match the tube size, then whatever it threads into. Gm did use some non-standard fitting od diameters at the prop valve and master cylinder, usually a larger od than parts store standard stuff.
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Old 05-17-2009, 07:15 PM
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ok i failed ......


couldn't find the right fittings anywhere. Got the flaring tool and was alls et to do it. I then attempted some reducers .... nothing fits.

Been doing some research and basicly i need a full brake line kit

OR

i can just upgrade the rears to discs and use my old valve from the drum/drum set-up.

Is this true?

It will be much easier to do this then to replace every single one of my lines.


Thanks for any info.
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Old 05-17-2009, 08:38 PM
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Quote:
Originally Posted by Nelson67Camino
ok i failed ......


couldn't find the right fittings anywhere. Got the flaring tool and was alls et to do it. I then attempted some reducers .... nothing fits.

Been doing some research and basicly i need a full brake line kit

OR

i can just upgrade the rears to discs and use my old valve from the drum/drum set-up.

Is this true?

It will be much easier to do this then to replace every single one of my lines.


Thanks for any info.
Disc/disc systems still need a proportioning valve, just a different one. They also need a different master cylinder.

The problem with the flare nut fittings is that GM used different, non-standard flare nut sizes to prevent cross-connections on the assembly line.
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Old 05-17-2009, 08:55 PM
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ok so apparently my only hope is for all new brake lines then right?

Is there a better explanation on why i need a proportioning valve for disc/disc?


My understanding is the drum drum was a matching set up. With a conversion to front discs i would need a little less up front versus what i have in the rear. (pressure wise) so thats why i needed the proportioning valve. Now going to a matching setup with disc/disc i wouldn't need a proportioning valve to alter pressures .....

just trying to see if i am understanding everything right.
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Old 05-17-2009, 08:56 PM
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and i have the master cylinder from the power front discs. Are you saying i would need a different one?
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Old 05-18-2009, 05:04 PM
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because regardless of what type brakes front and rear, the front should activate first and do more stopping of the vehicle than the rears should.

AFAIK anyways..




cant see anything else that i can comment or help with regarding this subject/issue here at this moments

good luck some more!
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Old 05-18-2009, 05:10 PM
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Quote:
Originally Posted by fast68
because regardless of what type brakes front and rear, the front should activate first and do more stopping of the vehicle than the rears should.

AFAIK anyways..




cant see anything else that i can comment or help with regarding this subject/issue here at this moments

good luck some more!
right and i agree there should be more front. With the drum / drum there should already be proportioning factored in for that correct. And by going to disc/disc i am not changing anything. Unless the discs require more or less .... then i understand the need for the different valve.




PS: i ordered a full bend it yourself brake line kit for a 72 ..... so i should be good this weekend.

Called around for pre-bent units and it seems nobody has them. Just the fronts ....


thanks for the good luck ! I need it
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