Recent content by 67GMC

  1. 67GMC

    Combination valve

    It's also strange that there is no mentioning of how to adjust this "proportioning" valve in the service manual I have for my 1988. I'm wondering if the incorrect part is attached to the poster's truck. I don't think a proportioning valve is needed with ABS systems. From what I have read, on...
  2. 67GMC

    Combination valve

    I think you're agreeing with me. The ABS models have a combination valve (not a proportioning valve).
  3. 67GMC

    Combination valve

    I have a feeling that the proportioning valve is only for non-abs equipped trucks. Most of the trucks in that vintage had the Kelsey-Hayees RWAL brakes and have a combination valve. I think the proportioning valve is used to "balance" the brake pressure front to rear but that's not needed with...
  4. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    Hmm-Steve is making me think now. I had almost no slack when I did mine a few months ago. Maybe I ordered the slightly shorter cables. My right drum was really tight because as I pulled the main cable to hook up to the front, I had to pull with vice grips to get it into that connector. 1"...
  5. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    Good to hear your progress. You won't need to worry about the fins on the new parts. When you push them in, the fins will expand and lock in place. IT's designed not to be easily removed. I think there is a tool to compress them. I've seen some people cut the "fingers" off the fins one at a...
  6. 67GMC

    One brake drum locking

    I think so too. Might put it in order of 2, 1, 3
  7. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    Sounds good. Just a note when you do the cables, it's sometimes easier to just cut them with bolt cutters instead of trying to getting them off if they're really rusty. They were almost welded on to my backing plates. Once you cut them, you don't have to fiddle around trying to flatten the...
  8. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    I've done at least three parking brake cables on various vehicles. None were the same. None were as straight-forward as I would have like. A VW one was the closest to easy I could get. I find it better to replace every piece though. In the rust belt, you can't rely on just getting new...
  9. 67GMC

    PARKING BRAKE CABLE - '94 C2500 - WHICH? Non-removable Molded Pad Cover? Removable Rubber Pad Cover?

    Yeah-To me, it's definitely about the pad style on the pedal. If you look closely at the pictures though, there are definite differences in the parts so if you take yours off first, that will more or less give you the clue as to what you should order. Hoping that you have the correct part on...
  10. 67GMC

    Parking Brake Cable install

    OK. As others have pointed out, that Dorman Parking Brake cable Connecter/adjuster is a POS. While adjusting the brakes, I pushed down on the pedal and the adjusting nut pulled through. I cleaned up the original part, rusty as ever, put it back together and working good. I readjusted the...
  11. 67GMC

    Parking Brake Cable install

    OK-I have lockup on jackstands with trans engaged but parking brake pedal to the floor. My understanding for parking brake is just as described, it's supposed to hold the vehicle in place. It's not an emergency brake that will stop a moving truck. For our inspection here, the parking brake...
  12. 67GMC

    Seafoam OR Marvel Mystery oil?

    Probably a quadrajet carb too. I remember lots of those. Old folks would complain that they went on the highway and had no power. The secondary's were usually stuck from never opening up around town. Lots of 350s like that (Buick, Cutlasses etc). Easy fix though. Carb cleaner or just a...
  13. 67GMC

    Seafoam OR Marvel Mystery oil?

    I don't think my '88 has a MAF sensor. It's throttle body.
  14. 67GMC

    Parking Brake Cable install

    I finally got around to installing new parking brake cables. Its not as bad a thing as it has been on some of my cars. For advice, use all new parts. On my '88 in the rust belt, everything was rusted up (as usual). So new rear left and right cables, new equalizer etc. I didn't end up...
  15. 67GMC

    Seafoam OR Marvel Mystery oil?

    I've used both. My scan tool showed a bad O2 sensor and it was running in open loop most of the time. So I changed the O2 sensor. It seemed a little better. I did Seafoam a few days ago. No adverse effects but not much improvement to the bog down it had when cold. I just replaced all 8...
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