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04-30-2015, 02:13 PM | #1 |
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65 GMC 1/2 ton brake line question
Hey
I've read and I can't find the answer. I have drum/drum. Currently, the line from the single master cyl to the front brakes is 1/4 but from the right front Tee to begin the rear, the line reduces to 3/16. Is that correct?? I am swapping the single master cylinder to a dual master cylinder with booster. I question if I should run 3/16 all the way to the rear, or run 1/4 and connect to the 3/16 with a reducer. This reduced connection would remain at the location of the right front tee. I suspect the PO (my deceased brother) altered the sizing back in the 90's when he restored this truck. At that time, he added a booster but kept the single master cylinder. Thanks for your suggestion. Cheers. |
04-30-2015, 02:31 PM | #2 | |
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Re: 65 GMC 1/2 ton brake line question
Quote:
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04-30-2015, 07:34 PM | #3 |
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Re: 65 GMC 1/2 ton brake line question
On my 62 the backs were different than the front, but I don't remember the exact size. My bleed valves were also different. Not sure if that is the stock design or not.
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04-30-2015, 07:51 PM | #4 |
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Re: 65 GMC 1/2 ton brake line question
Right 3/8. Not 3/16. im still not sure what size line to run to the rear.
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04-30-2015, 08:01 PM | #5 |
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Re: 65 GMC 1/2 ton brake line question
Actually, I think the rear lines are smaller, so 3/16" sounds right. My bad. It was a typo. 3/16" sounds right.
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04-30-2015, 08:25 PM | #6 |
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Re: 65 GMC 1/2 ton brake line question
When I did mine I left the 3/8 line alone going to the rear and ran 3/16 line for the front.
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04-30-2015, 08:28 PM | #7 | |
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Re: 65 GMC 1/2 ton brake line question
Quote:
But basically I'm thinking that the line size would not change even though you are running a dual master. I'm gonna look for a thread on the subject and post it here when I find it.
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04-30-2015, 08:40 PM | #8 |
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Re: 65 GMC 1/2 ton brake line question
Lugnutz, we may all be wrong but if I remember right the rear brakes on a drum drum setup do most of the work
Unlike disc brakes. Mine stops great with this combination and I think key word being THINK I read this on the forum somewhere. I hope I'm right cause I don't want to have to change mine. |
04-30-2015, 08:55 PM | #9 | |
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Re: 65 GMC 1/2 ton brake line question
Quote:
I'll be able to sleep better now. Haha!
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04-30-2015, 09:02 PM | #10 |
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Re: 65 GMC 1/2 ton brake line question
Thanks a lot Lugnutz, I'm still at work won't get out till 10:00 then have to be back at 9:30 in the morning with no sleep cause I got the wrong brake line setup!
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04-30-2015, 10:49 PM | #11 |
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Re: 65 GMC 1/2 ton brake line question
Ok Cool. Thanks for everybody's discussion. No worries Lugnutz65- even I mixed up the dimensions. Agreed 1/4 to the front brakes, 3/16 to the rear.
So.... now that I'm swapping the single master to a dual... do I run 3/16 hardline right from the master for the rear brakes?? |
04-30-2015, 10:50 PM | #12 | |
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Re: 65 GMC 1/2 ton brake line question
Quote:
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05-01-2015, 06:18 AM | #13 | |
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Re: 65 GMC 1/2 ton brake line question
Quote:
__________________
My 65 C10 build: www.lugnutz65chevystepside.weebly.com Want to know more about T5 transmissions? My website has a T5 Info Page and a Step by Step T5 rebuild. |
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05-01-2015, 12:05 PM | #14 |
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Re: 65 GMC 1/2 ton brake line question
my 61 k10 (4x4) had 1/4" front to rear then split to 3/16" to each rear wheel cyl.
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05-01-2015, 12:11 PM | #15 |
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Re: 65 GMC 1/2 ton brake line question
What make or brand or year of dual master are you installing?
Ken |
05-01-2015, 01:54 PM | #16 | |
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Re: 65 GMC 1/2 ton brake line question
Quote:
Then that's my plan. I'll plan to go disc next year so a portioning valve now would save headache later. Thanks. |
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05-01-2015, 01:59 PM | #17 |
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Re: 65 GMC 1/2 ton brake line question
Ken, I picked up a "MBM" brand master cylinder and dual chamber booster for a 1967-72 C10, C20 truck. I found it at a local brake shop. Im in the process of installation but it will be another week before Im finished.
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05-01-2015, 02:07 PM | #18 |
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Re: 65 GMC 1/2 ton brake line question
Well, in fluid dynamics, when you go from a larger diameter line to a smaller diameter one, the pressure increases. So the smaller line to the back is intended to increase efficiency to the rear brakes and should remain.
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01-06-2016, 09:39 PM | #19 |
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Re: 65 GMC 1/2 ton brake line question
Ok..65 c10..drum-drum
Went to replace 1 rubber hose and I know Need to replace all! 1-MC to first T 32"? 1-short T to drvr rubber 9"? 1-long(about as long as MC to T) from 1st T to psngr side T 28"? 1-short from T to psngr rubber 9"? 1-long to back T. ?" 1-short to psngr rear rubber 1-long to drvr rear rubber Have I got them all? Will probably have to cut them off But hopefully can at least keep og to rear from psngr T Should I buy length and bend as needed Or buy a roll and make them myself? (seems immensely cheaper) Anyone have or can get me measurement so if I do them myself I know how much I need? And the new MC has 2 places for hoses? 1 for front and one for rear?? |
01-06-2016, 10:31 PM | #20 |
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Re: 65 GMC 1/2 ton brake line question
I'm going to measure between 3/16-1/4"
Can I just use either or?? How much do I need? 8' front? Rolls come on 25' I believe.. Will that be enough? What's the thread pitch 3/8-24? I would like to get all I need before I dig in |
01-09-2016, 12:21 AM | #21 |
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Location: Dallas Ga
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Re: 65 GMC 1/2 ton brake line question
Sounds like your making your own lines from a roll. If you buy the straight pieces at a parts house just make sure you get the American threads on your couplings. They used to all be American and now they are made with threads from 5 different countries!!!
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