Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Interchangable Master Cylinders?

Discussion in 'The Garage' started by k5blaze, Feb 17, 2004.

  1. k5blaze

    k5blaze Newbie

    Joined:
    Feb 17, 2004
    Posts:
    1
    Likes Received:
    0
    Location:
    OH
    well i just found out that the master cylinder on my 78 k5
    is no good. i was wondering what year master cylinders were interchangable?
     
  2. Muddytazz

    Muddytazz 1 ton status

    Joined:
    Jun 30, 2002
    Posts:
    20,073
    Likes Received:
    0
    Location:
    Salem, Or.
    Pretty much most of them are. You can use a 1/2ton or 3/4ton M/C from like 73 - 84 or 85 i believe /forums/images/graemlins/thumb.gif
     
  3. dremu

    dremu Officious Thread Derailer Premium Member

    Joined:
    Feb 27, 2000
    Posts:
    15,963
    Likes Received:
    454
    Location:
    East of San Francisco
    Parts store would know for sure. I know by ~'85 there was a difference, and the newer masters won't fit the older brake boosters. I put a later model master on my Chalet (hey, it's overweight, it needs the help!) and had to switch to the later booster too.
     
  4. R72K5

    R72K5 Banned

    Joined:
    Mar 5, 2001
    Posts:
    8,905
    Likes Received:
    0
    Location:
    central IL
    it will work, but 1/2 ton is oddball and has lines swapped fron to rear, and in 80 they started with aluminum body m/c's especially on base model c-10's

    3/4 and 1 ton have lines setup same as eachother, opposite of 1/2 tons
     
  5. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

    Joined:
    Jan 27, 2003
    Posts:
    3,254
    Likes Received:
    0
    Location:
    Castro Valley, CA
    I was wondering baout this too. I want to put a newer (like 98 or so) Brake booster and master cylinder on my 72. I have seen it done, does it just bolt right up?
     
  6. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

    Joined:
    Jan 27, 2003
    Posts:
    3,254
    Likes Received:
    0
    Location:
    Castro Valley, CA
  7. bablazer73

    bablazer73 1/2 ton status

    Joined:
    Apr 4, 2000
    Posts:
    3,363
    Likes Received:
    0
    Location:
    upstate ny
    I put power brakes on a buddies 70 2x awhile back. For some reason, And i don't really recall, I couldn't use the late model booster. I had one laying around we tried to use. I think the diameter was bigger and it wouldn't clear the hood.

    there is a difference in the pilot size of the master cylinders from early to late. But i don't know what the year split was. If you change the whole booster/master assembly, It will work. The booster/master in my 73 came from an 85 3/4 ton.
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,980
    Likes Received:
    189
    Location:
    Roy WA
    In cars around '91 apparently the bolt spacing changed. I wouldn't doubt it happened in trucks with the new body style as well, but I'm not sure when...I have the ABS bracket out of an '88+ body style truck bolted to the studs for the booster/master cylinder in my '86, so if that measurement did change, I don't know when.
     

Share This Page