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Thread: Chevy Corvette C3 Parking Brake Adjustment

  1. #1
    Charles Halliman
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    Default Chevy Corvette C3 Parking Brake Adjustment

    I need help in adjusting my parking brake on my 1969 vette. I have the
    service manual and the assembly manual. I followed the instructions in
    the assembly manual on page J191, adjusting the nut near the equalizer
    to tighten the cable. The Parking brake holds better, but not like it
    used to. I can put the car in reverse and the brake holds with minimum
    acceleration. However, in first or second gear there is no hold with
    minimum acceleration. I'm afraid to tighten the nut any more unless
    it won't break something.

    On page 5-23 of the service manual, another adjustment is indicated. I
    should tighten the "disc" adjustment screw (at least I think
    that's what it is). Now the picture in the service manual shows one
    hole, but there are a number of holes on my disc. According to the
    manual's directions, one should turn the disc until the adjusting
    screw is seen through the hole. I've turned my disc and I don't see
    a screw.

    Here are my questions:

    1. Is there a screw for tightening the disc that can be found through
    one of the holes on the disc? If so, how do I find it?

    2. Do I need to tighten this screw as part of making the parking brake
    hold better?

    3. Is there any danger to continuing to tighten the cable? If this is
    the way to tighten the cable, I will continue to see if I can make the
    brake hold better with very minor acceleration.

    Please get back to me with comments as soon as you can. I need to get
    an inspection sticker, and the parking brake is checked as part of the
    inspection. The inspector accelerates very slightly and expects the
    brake to hold.

    Thanks,
    Charles

  2. #2
    Barking Rats
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    Default Chevy Corvette C3 Parking Brake Adjustment

    In article <1147267136.629881.187700@u72g2000cwu............. .com>,
    "Charles Halliman" <halliman1@netscape.com> wrote:

    > 1. Is there a screw for tightening the disc that can be found through
    > one of the holes on the disc? If so, how do I find it?


    Yes this is what you need to find to properly adjust the p-brakes. You
    access the "screw" through a hole in the hub area of the disk - the same
    surface where the wheel studs are located. Raise both rear wheels off
    the ground and remove them. With the car in neutral, rotate each disk so
    that the empty hole (no stud) is at the bottom and closest to the ground
    - you may be able to peer into it to see the "screw" - which is not
    really a screw but a star-wheel (kinda like a gear - you'll only be able
    to see the teeth - like looking at a gear's edge). The screw driver is
    used to catch the teeth and push them upwards or downwards to adjust the
    brakes. By rotating the star-wheel, you are in effect, changing the
    length of a spacer between the p-brake shoes.

    Look in your service manual to see if there's an exploded parts view for
    overhauling the brakes - you'll see the star-wheel in the lower portion
    of the diagram and how it sits between the p-brake shoes.

    Here's the procedure for adjustment:
    1) after removing the wheels - you did use jackstands to support the
    car, yes? - with the hand brake released, loosen the cable nut you
    tightened earlier, to the point that there's plenty of slack and no
    tension on the cables.

    2) working on one side at a time, tighten the star-wheels until you
    can't rotate the brake disk and then back off the star-wheel 6-8
    notches.

    3) set the handbrake lever 2 or 3 clicks and then tighten the cable nut
    to take up the slack plus a quarter turn more. Rotate the hubs - you
    should just feel slight drag. When you release the hand lever, you
    shouldn't feel any drag at all.

    Viola!

    > 2. Do I need to tighten this screw as part of making the parking brake
    > hold better?


    Yes.

    > 3. Is there any danger to continuing to tighten the cable? If this is
    > the way to tighten the cable, I will continue to see if I can make the
    > brake hold better with very minor acceleration.


    Yes - you could snap the cable. It's used only to make minor adjustments
    - if the shoes are worn or not adjusted properly, it's not the way to go
    about making them work better.

    Here's waving to ya - \||||

    Owen
    ___

    '67BB & '72BB

    -- not affiliated with JLA forum in any way -- alt.autos.corvette is
    original posting --
    ___

    "To know the world intimately is the beginning of caring."
    -- Ann Hayman Zwinger

  3. #3
    Barking Rats
    Guest Barking Rats's Avatar

    Default Chevy Corvette C3 Parking Brake Adjustment

    In article
    <noemails-5DA977.09310610052006@sn-ip.vsrv-sjc...........net>,
    Barking Rats <noemails@myemail.com> wrote:

    > > 1. Is there a screw for tightening the disc that can be found through
    > > one of the holes on the disc? If so, how do I find it?


    I just wanted to clarify that the access hole is not on the outer edge
    of the disk - these are cooling spaces - but located near the center of
    the disk on the same surface where the wheel mounts.

    Here's waving to ya - \||||

    Owen
    ___

    '67BB & '72BB

    -- not affiliated with JLA forum in any way -- alt.autos.corvette is
    original posting --
    ___

    "To know the world intimately is the beginning of caring."
    -- Ann Hayman Zwinger

  4. #4
    Charles Halliman
    Guest Charles Halliman's Avatar

    Default Chevy Corvette C3 Parking Brake Adjustment

    Barking Rats,

    I went out and looked. Except for the five holes between the studs and
    a center hole, there are no more holes.

    1. Am I suppose to see the adjusting screw through one of those holes?
    If so, I don't see it.

    2. Also, can I do one wheel at a time, or do I have to rotate one
    wheel, then the other, then look for the screw?

    Thanks,
    Charles

  5. #5
    Barking Rats
    Guest Barking Rats's Avatar

    Default Chevy Corvette C3 Parking Brake Adjustment

    In article <1147285421.395120.69640@j33g2000cwa.............. com>,
    "Charles Halliman" <halliman1@netscape.com> wrote:

    > I went out and looked. Except for the five holes between the studs and
    > a center hole, there are no more holes.
    >
    > 1. Am I suppose to see the adjusting screw through one of those holes?
    > If so, I don't see it.
    >
    > 2. Also, can I do one wheel at a time, or do I have to rotate one
    > wheel, then the other, then look for the screw?


    I believe I know what's going on. From the factory, the rotor is held to
    the axle hub with rivets. These need to be drilled out to remove the
    rotor, which I believe has been done in the past on your car and that's
    why you see 5 holes (I think there are only 4 rivets). When the rotor
    was put back on the hub, the service person didn't replace the rotor so
    the access hole in it lined up with the access hole in the hub.

    In order to do the job properly, you'll need to pull the calipers off
    the rotor (pull the center pin from the pads and use a large socket to
    keep the pads apart so they don't close up when the caliper is free of
    the rotor). Pull off the disk -- and as long as the disk is off, inspect
    the parking brake pads and hardware -- make note of the star wheel
    adjuster so you know what action is happening when it's all put back
    together and you're back to making the adjustments. Align the access
    hole in the rotor with the access hole in the hub.

    Yes, you adjust one wheel at a time, but both need to be in the air so
    you can freely rotate the side you're working on to feel for any drag.

    Here's waving to ya - \||||

    Owen
    ___

    '67BB & '72BB

    -- not affiliated with JLA forum in any way -- alt.autos.corvette is
    original posting --
    ___

    "To know the world intimately is the beginning of caring."
    -- Ann Hayman Zwinger

  6. #6
    dave
    Guest dave's Avatar

    Default Chevy Corvette C3 Parking Brake Adjustment

    'I need help in adjusting my parking brake on my 1969 vette'

    REPLY: On my 1970, I had two seasoned Vette Mechanics adjust the
    parking brake ; both times the parking brake dragged afterward. The
    first time, I immediately went on a 8 hour trip and averaged 10 mpg
    while smelling the heat from the brakes. So...after you get it
    adjusted, recheck it to be sure they arent dragging. I don't know why
    both mechanics couldn't get it adjusted correctly ; I ended up not
    having a parking brake that engages after all that because I told the
    last mechanic to just put it back to how I brought it in.

  7. #7
    Barking Rats
    Guest Barking Rats's Avatar

    Default Chevy Corvette C3 Parking Brake Adjustment

    In article <19561-44625CCA-129@storefull-3231.bay...........>,
    Fast1970Vette@.......... (dave) wrote:

    > REPLY: On my 1970, I had two seasoned Vette Mechanics adjust the
    > parking brake ; both times the parking brake dragged afterward. The
    > first time, I immediately went on a 8 hour trip and averaged 10 mpg
    > while smelling the heat from the brakes. So...after you get it
    > adjusted, recheck it to be sure they arent dragging. I don't know why
    > both mechanics couldn't get it adjusted correctly ; I ended up not
    > having a parking brake that engages after all that because I told the
    > last mechanic to just put it back to how I brought it in.


    I suspect your p-brakes may have been in need of a rebuild - as in
    replacing all the springs and mounting pins. They get rusty, heat
    stressed and just worn out - plus the lube on the rub spots and pivot
    points dries out and can get gummy.

    Here's waving to ya - \||||

    Owen
    ___

    '67BB & '72BB

    -- not affiliated with JLA forum in any way -- alt.autos.corvette is
    original posting --
    ___

    "To know the world intimately is the beginning of caring."
    -- Ann Hayman Zwinger

  8. #8
    dave
    Guest dave's Avatar

    Default Chevy Corvette C3 Parking Brake Adjustment

    'I suspect your p-brakes may have been in need of a rebuild - as in
    replacing all the springs and mounting pins. They get rusty, heat
    stressed and just worn out - plus the lube on the rub spots and pivot
    points dries out and can get gummy.
    Here's waving to ya - \||||
    Owen'

    REPLY: That could very well be. In any case, I don't really have a need
    for a Parking Brake ; I just leave it in gear when I park.

  9. #9
    Barking Rats
    Guest Barking Rats's Avatar

    Default Chevy Corvette C3 Parking Brake Adjustment

    In article <10707-44628EBD-135@storefull-3236.bay...........>,
    Fast1970Vette@.......... (dave) wrote:

    > That could very well be. In any case, I don't really have a need
    > for a Parking Brake ; I just leave it in gear when I park.


    I did that once when I parked in a friend's steep driveway in a '65,
    4-speed. Came out of his house to find my car at the bottom of his drive
    - it appears gravity overcame inertia and engine compression.

    Here's waving to ya - \||||

    Owen
    ___

    '67BB & '72BB

    -- not affiliated with JLA forum in any way -- alt.autos.corvette is
    original posting --
    ___

    "To know the world intimately is the beginning of caring."
    -- Ann Hayman Zwinger

  10. #10
    dave
    Guest dave's Avatar

    Default Chevy Corvette C3 Parking Brake Adjustment

    'I did that once when I parked in a friend's steep driveway in a '65,
    4-speed. Came out of his house to find my car at the bottom of his drive
    - it appears gravity overcame inertia and engine compression.
    Here's waving to ya - \||||
    Owen '

    REPLY: Thanks for the heads up ; Ill stay on fairly level ground.

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