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Brake upgrade?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by Stroked72Blazer, Jan 14, 2003.

  1. Stroked72Blazer

    Stroked72Blazer 1/2 ton status

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    I have a 72 K5 with 33" tires soon to be 35"s. Will my stock brakes be good enough or do I need bigger rotors? Will any thing interchange with it or do I need to find a kit? The brakes won't hold it still on steep hills so I am going to rebuild them, but, I don't want to waste money rebuilding it stock only to find out it nees upgraded.
     
  2. TheBlazerKid

    TheBlazerKid 1/2 ton status

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    kill two birds with one stone and put 3/4 or one ton axles under it, bigger brakes and stronger axles!...If it wont hold it on a hill with 33's then I would say here is something wrong somewhere. rebuilding them will probably help. maybe a new master cylender. Im not a brake pro so im not sure on this but could the vacume booster be stuck so its acting as non-power brakes? just a thought.
    hope this helps.
     
  3. Stroked72Blazer

    Stroked72Blazer 1/2 ton status

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    Are 3/4 or 1 ton axles heavier than stock. Would it be posible to scavenge the hardware off a 3/4 ton axle.
     
  4. '72brett

    '72brett 1/2 ton status

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    Stock is 1/2 ton axels, 3/4 ton axels are very easy to find, but I know around here, 1ton would be tough, but thats just around my small town. We got quite a few 3/4 axels behind the barb. Someday when I learn how and have enough time, I will probably make the swap.
     
  5. Triaged

    Triaged 1/2 ton status

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    3/4 ton axles are the same strength as stock (still a dana44) but the rears are very strong (they are 14bolts).
    Going to 3/4ton IMO is not worth it for just the brakes. They arn't all that much bigger than the
    1/2 ton stuff in the front and the rear doesn't get much use.

    However a 14bolt is a very strong axle and is worth it if you plan to take it offroad much.
    Also 3/4 and 1-tons have 8 lug so you will need new wheels (and tires if you have 15" and don't
    want to grind the calipers).
     
  6. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    It might sound dumb, but check the vacuum booster hose...!

    I had a friend show me that mine was NOT the correct type of hose and had collapsed shut due to vacuum pressure, so effectively I have NO power booster!!

    I was experiencing the same sort of "brakes won't hold on a steep hill" type effect, and that's with a D60 front and 14BFF with the disc brake conversion....so I've got PLENTY of holding power "potential"

    I'm going to swap the hose out today, but I won't be able to do a test drive for a couple days..... Anyway, if it's advice that helps, you're welcome to use it!! /forums/images/graemlins/thumb.gif
     
  7. Stroked72Blazer

    Stroked72Blazer 1/2 ton status

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    What I mean by heavier is weight. Is there a way to use use the bigger brakes without swapping axle and without too much fabrication?
     
  8. SHINTON

    SHINTON 1/2 ton status

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    Hey, check out that A-Tron link above, they have a killer deal on changing out your rear drums to disks for the 12 bolt that we have. $185 plus you go buy some new calipers which compared to $500+ I have seen elsewhere is a pretty good deal!

    I may have to consider it myself.... then again, the other points regarding the heavier axles are good too. My ultimate goal is to put a Dana 60 in the front and prob 14FF in the rear, with drilled rotors on all 4 corners.

    Sam Hinton
     
  9. Steve_Chin

    Steve_Chin 1/2 ton status

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    Agree with Triaged, the 3/4 ton brakes are nop bigger than 1/2 ton brakes (1/2 ton brakes just barely fit inside the 15" wheels, just like the 3/4 ton brakes). If you're concerned about fade ,add some cooling ducts. Use the best avaiulable pads with the highest coefficient of friction.
     

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