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  •  » 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

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    3/24/2026 2:23 PM  #1

    Michael H.
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    From: Laurel, MS
    Registered: 4/01/2013
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    66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    I've been doing some work on my Father-in-Law's '66 coupe, and I need to make new hard lines from the brake hose out to the wheel cylinders on the 8 inch rear end.  I've been doing some searching and reading on here about using the '69 Mustang brake hose since this car will eventually have dual exhaust. 
    My question is, when using the '69 brake hose on his '66, which axle vent nipple should I use? 
    Is the '66 one too long?  If so, should I just cut it down, or should I get the nipple for a '69?

    Last edited by Michael H. (3/24/2026 2:23 PM)

     

    3/24/2026 5:31 PM  #2

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,732

    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    The 65-66 dual exhaust hose and the 69 hose are very nearly the same. The difference is the length of the hollow bolt that attaches it to the housing. You can shorten the original one and rethread it for 7/16” fine threads

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    3/25/2026 9:48 AM  #3

    Michael H.
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    From: Laurel, MS
    Registered: 4/01/2013
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    I'm probably overthinking this but these are my current thoughts:

    '66 dual exhaust hose
     - Pro:  Already has the correct inlet size on it.  (No need to change the fitting on the hard line on the body.)
     - Con:  Might not be able to find a replacement quickly in most small towns.

    '69 hose
      - Pro:  Might be more likely to find a replacement quickly in most small towns.
      - Con:  Requires modification to the hard line on the body.

    Are there other Pros or Cons I'm missing?  What did you use on your '66 ?

       •Thread Starter
     

    3/25/2026 12:34 PM  #4

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    If you're that worried about finding a replacement, but 2 and keep one in the trunk as a spare.  

     

    3/25/2026 1:21 PM  #5

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    Michael H. wrote:

    I'm probably overthinking this but these are my current thoughts:

    '66 dual exhaust hose
     - Pro:  Already has the correct inlet size on it.  (No need to change the fitting on the hard line on the body.)
     - Con:  Might not be able to find a replacement quickly in most small towns.

    '69 hose
      - Pro:  Might be more likely to find a replacement quickly in most small towns.
      - Con:  Requires modification to the hard line on the body.

    Are there other Pros or Cons I'm missing?  What did you use on your '66 ?

    Oreilly’s carries the 65-66 hose.  So does Summit

    Last edited by MS (3/25/2026 1:21 PM)

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    3/26/2026 7:14 AM  #6

    Michael H.
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    From: Laurel, MS
    Registered: 4/01/2013
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    My local Oreilly's doesn't carry the dual exhaust hose for a '66, but they do carry the '67-69 hose (see screenshots below)... which perfectly illustrates my point that it might be harder to get a replacement for the '66 hose in a pinch.




    Last edited by Michael H. (3/26/2026 7:17 AM)

       •Thread Starter
     

    3/26/2026 7:16 AM  #7

    Michael H.
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    From: Laurel, MS
    Registered: 4/01/2013
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    TKOPerformance wrote:

    If you're that worried about finding a replacement, but 2 and keep one in the trunk as a spare.  

    I understand your point, and I could do that, but then the spare would be just as old as the original.  I'd much rather use a part that's easily available.

       •Thread Starter
     

    3/26/2026 8:19 AM  #8

    Steve69
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    From: Madison Wisconsin
    Registered: 4/01/2013
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    Check out www.rockauto.com 
     

     

    3/26/2026 1:41 PM  #9

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    Michael H. wrote:

    TKOPerformance wrote:

    If you're that worried about finding a replacement, but 2 and keep one in the trunk as a spare.  

    I understand your point, and I could do that, but then the spare would be just as old as the original.  I'd much rather use a part that's easily available.

    Available is a relative term for parts for a 60 year old car.  Just because the store near you stocks a part also doesn't mean that all those stores stock it.  I had to wait a day for something as stupid as a oil pan gasket last week.  20 years ago it would have been in stock.  These cars are getting to be fewer and farther between and stores don't keep inventory like they used to.  

     

    3/26/2026 9:06 PM  #10

    Nos681
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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    Or you could use a stainless line.

     

    Yesterday 7:18 AM  #11

    Michael H.
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    From: Laurel, MS
    Registered: 4/01/2013
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    I've never used stainless brake hoses before.  I've heard they make a big difference in pedal feel.
    Honestly, it's not that much more expensive than the rubber hose.  $12 shipping is rough, but that's become pretty common, unfortunately.

       •Thread Starter
     

    Yesterday 5:01 PM  #12

    lowercasesteve
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    From: Auburn, Ca
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    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    I've special ordered custom brake lines from one of the brake parts companies several times with no problems.  I just told them what connectors on each end and how long.  They got them out to me in less than two weeks.  Price was about what they would cost from a parts dealer.

    Sorry, I can't remember which one.  It was a long time ago.

    Whoops!  I always get stainless steel lines.

    Last edited by lowercasesteve (Yesterday 5:02 PM)

    Original owner - 351w,T-5, 4whl disks, power R&P
     

    Today 5:47 AM  #13

    BobE
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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,958

    Re: 66 Mustang Rear Brake Hose - Using 69 Mustang Hose

    Suggest checking out Pure Choice Motorsports for plumbing:: https://www.purechoicemotorsports.com/

     

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

     

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