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Need help figuring out my brake line size?

Discussion in 'Chevy C/K Truck Forum' started by Jonezee, Nov 2, 2013.

  1. Jonezee

    Jonezee New Member

    Hey guys, the title is kinda self explanatory haha.
    88 Chevy C1500 Silverado Regular Can Long Bed.
    Gross Vehicle Weight: 5600.
    ...yeah i have a leak in case you were wondering haha. :/
    Thanks!
  2. ChevyFan

    ChevyFan Administrator Staff Member 5+ Years 5000 Posts

  3. ChevyFan

    ChevyFan Administrator Staff Member 5+ Years 5000 Posts

    This information was found using that part number on s different site.

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    : BRAKE SYSTEM,HYDRAULIC POWER DISC,DRUM HYD PWR DISC/DRUM BRK(JB8); BRAKE SYSTEM,HYDRAULIC POWER DISC,DRUM HYD PWR DISC/DRUM BRK(JD 5 ); BRAKE SYSTEM,HYDRAULIC POWER DISC,DRUM(DIESEL ENGINE)(ROTOR=11.86"X1.2 HYD PWR DISC/DRUM BRK(JD 5 ); BRAKE SYSTEM,HYDRAULIC POWER DISC,DRUM(DIESEL ENGINE)(ROTOR=11.86"X1.29",REAR BRAKE SHOE=11.15"X2.75") HYD PWR DISC/DRUM BRK(JD5); BRAKE SYSTEM,VACUUM POWER DISC,DRUM VACUUM PWR BRK SYS(JB5)

    **********
  4. ChevyFan

    ChevyFan Administrator Staff Member 5+ Years 5000 Posts

    Sorry. That doesn't give much info. I'm still looking.
  5. Jonezee

    Jonezee New Member

    Oh ok then.
  6. Pikey

    Pikey Moderator Staff Member 2 Years ROTM Winner 1000 Posts

    Are you having an issue finding the leak? I usually fill the master cylinder and than have someone press the pedal. Leaks usually shoot out of the line. If you can not find it at a line, then check the front calipers and finally, pull the srums off the rear and look at the wheel cylinders. If none of those are the culprit then take a look at the master cylinder paying particular attention to where it mounts to the brake booster. See if there is fluid running down the front of the booster. If that is not it then grab a flash light and crawl under your dash. I have seen master cylinders leak internally and then leak back thru the booster. So, look at where the rod goes from the pedal to the booster. See if fluid is leaking from the booster into the truck.
  7. Jonezee

    Jonezee New Member

    If I let the truck sit for 30 mins or more I guess, on pavement, then brake fluid shows up on the ground along the underside of the driver side of the truck.
    I got it inspected a couple weeks ago and that's where I finally found out one of the brake lines is leaking.

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