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Front brake hoses

Discussion in 'Suspension, Steering & Brakes' started by Scott91370, Feb 10, 2020.

  1. Scott91370

    Scott91370 Full Access Member

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    Scott
    Truck Year:
    1982
    Truck Model:
    Sierra1500
    Engine Size:
    350
    I decided to replace the hoses on the front because my daughter will be driving the truck and I want to make sure she can stop and the hoses are 38 years old (as far as I know).
    When I went to look it wants to know which size REAR brakes (11" or 11-5/32") the truck has before I can pick the front hoses. I thought this odd but remembered that there are 2 different front brakes, which would make more send. I have the 1" thick rotors, does this correspond to a certain rear brake? I would think the 11" but I know how engineers can be.

    Thanks!
     
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  2. chengny

    chengny Full Access Member

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    Only the JB 1&3 systems have 1" rotors in the front and both of those systems use 11" drums for the rears:

    Pages from X8232_1982_GMC_CKGP_Light_Duty_Truck_Service_Manual.JPG
     
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  3. Charlie

    Charlie Mopar by Birth. Chevy by Choice.

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    350/TH350/AC/4 BBL Quadrajet
    I have replaced front flex hoses on a 72 and a 74 and rear brakes sizes were not a factor in purchasing the hoses for the front. Front disk brakes/drums may be a factor but I don't see what the rear has anything to do with the front.
     
  4. Scott91370

    Scott91370 Full Access Member

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    chengny, you have way too much knowledge of these trucks! But I sure am glad you do!!

    Thanks!!!

    Charlie, you would think a hose is a hose when they're for the same year truck but when you look them up they have different part numbers. Guess I'd have to see them side by side to know the diffrence.

    hoses.JPG
     
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  5. Charlie

    Charlie Mopar by Birth. Chevy by Choice.

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  6. Charlie

    Charlie Mopar by Birth. Chevy by Choice.

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    All I'm saying, is, I when I purchased them from Oreilly for both trucks is I do not remember the rear brakes sizes being a factor for the front flex hoses. All of them fit correctly. Unless the 80's models are different than the 70's. Then if so, my bad.
     
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  7. 82Diesel

    82Diesel Full Access Member

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    Where is that Diagram from, And is it for 1/2 ton trucks?
    I love that it mentions Diesel Equipped like mine.

    Nvm I seen on the picture filename ;)
     
  8. Ronno6

    Ronno6 Full Access Member

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    IN THEORY,11X2 Rear brakes , JB3, would have front rotors 1" thick.

    My 84 C10 was not this way, and it gave me fits.....
    It had JB3 rears and JB5 fronts (!-1/8" thick rotors) and JB5 booster.

    Best to measure the front rotor thickness to determine brake hoses....
     
  9. Scott91370

    Scott91370 Full Access Member

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    Never mind. I decided to read a little (only took a couple of short articles) to find that it would work but since the rest of the system really needs DOT3 and since DOT4 absorbs water quicker which in turn lowers the boiling point I now find the below questions mute and totally unnecessary..



    Question about brake fluid...

    Since I am replacing all rubber lines and the entire system will be open, would there be an issue with changing from DOT3 to DOT4 fluid? Would any of the components not be compatible?
     
    Last edited: Feb 14, 2020
  10. AuroraGirl

    AuroraGirl Full Access Member

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    IIRC, there is something about DOT 6 working in DOT 3 but not recommended because it would cause issues with ABS and traction modules in newer vehicles. However, I dont know that so you should definitely not try it without further research.
     
  11. CORVAIRWILD

    CORVAIRWILD Full Access Member

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    I've bot custom made stainless hoses made by a fellow in Holland Michigan. He offers black plastic sheathing that more resembles original black rubber.

    And the aftermarket hoses are made in Mexico at best, and mostly China at worst. And I've notice the rapid deterioration of Chinese rubber products.

    I've bot hoses from this fellow in the past, and his customer service is second to none. And I was getting hoses for an obscure 1977 Chevy C60 dump truck that didn't even show up in listings at the time

    Screenshot_20200217-132718.png Screenshot_20200217-132718.png

    Screenshot_20200217-132924.png
     
    Last edited: Feb 17, 2020
    highdesertrange and Scott91370 like this.

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