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Thread: Why Drums??

  1. #1

    Default Why Drums??

    My dad has an '04 Extended Cab Z71 and has rear disk brakes. My '06 CC Z71 has drums. Does anybody know why GM went from disks to drums?

  2. #2


    A quick reply............$ $

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  3. #3


    I was told they went to them due to the corrosion issues on the disks. I Changed my rear brakes more often than my front with my 01. Thats not right. Your front do 70-80% of your braking.

  4. #4

    Cool Why Drums??

    My 05 Z-71 crewcab also has rear drums. I was tould that the 1500s with trailer package has drums????? Havent been able to confirm this.

  5. #5


    Quote Originally Posted by silveradotrailblazer View Post
    My 05 Z-71 crewcab also has rear drums. I was tould that the 1500s with trailer package has drums????? Havent been able to confirm this.
    Dad's '04 has the trailer package and disks, and it's a 1500. He did tell me the other day he needed rear brakes (60k miles) but his fronts were good.

  6. #6

    Cool Why Drums??

    Anyone else have any ideas???

  7. #7
    Master Mechanic
    Join Date
    Apr 2009
    Owens Cross Roads, Alabama


    i personally like the disk brakes better because im clueless when it comes to replacing drums..
    2004 Silverado 4x4
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  8. #8
    Master Mechanic TritonBoulder47's Avatar
    Join Date
    Nov 2009
    Tunkhannock, PA (North East)


    Sound like the proportion valve on your trucks isn't functioning properly... I have 4-wheel discs on my Av and all 4 of mine get changed at the same time, and all 4 have just about the same amount of wear on them...

    Tim a.k.a. Da' Boulder

    2003 Chevrolet Avalanche Z71 - Custom Emergency Response POV

    Firefighter, Fire Policeman, Ambulance Driver, Rescue Tech, Emergency Lighting Installer

    Tint, 20's, Bull Bar, Intake, Exhaust, Billet Grill, Stereo, Custom Console, Emergency Equipment, and the list goes on...

  9. #9


    i was wondering this same thing. Bought a new 08 last year, Top of the line LTZ 4x4 Crew with the HD tow package and it came with read drum brakes. I was surprised to see this, I figured all newer trucks, especially the higher end ones came with disc brakes.

    I don't really care it stops on a dime. But my guess is that drum brakes are probably tied to the HD tow package like someone else explained. I am out on a limb here, but I think drum brakes stay cooler resulting in less fade, especially if you were pulling something pretty heavy.

    Yesterday I had around 2000lbs in the bed and I was able to stop almost as quick as normally without any extra weight in the back. I was also surprised that the bed actually handled that much weight very well, there was almost no sag in the rear, as opposed to my buddies F150 that we loaded a while back with about the same amount of weight and his fenders were almost rubbing his rear tires.
    2008 Silverado LTZ Crew 4x4 5.3L

    Stock 20 w/ Cooper Zeon LTZ 33's
    HD Trailering
    Alumiknox Black Truck Box
    Bilstein 5100's Leveling Shocks

  10. #10


    You might also consider that rear drums are much more effective as parking brakes, which may be part of the reason they are used with towing/trailering packages. The tiny drums inside the rear disks are worse than useless, particularly for a large load on a significant grade.

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