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1 22nd June 07:33
charles halliman
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Posts: 1
Default 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
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2 22nd June 07:33
barking rats
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Default C3 Parking Brake Adjustment


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!


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
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'67BB & '72BB

-- not affiliated with JLA forum in any way -- alt.autos.corvette is
original posting --
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"To know the world intimately is the beginning of caring."
-- Ann Hayman Zwinger
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3 22nd June 07:33
barking rats
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Default C3 Parking Brake Adjustment


In article
<noemails-5DA977.09310610052006@sn-ip.vsrv-sjc.supernews.net>,

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 --
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4 22nd June 07:33
charles halliman
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Default 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
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5 22nd June 13:08
barking rats
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Posts: 1
Default C3 Parking Brake Adjustment


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 --
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-- Ann Hayman Zwinger
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6 22nd June 13:08
fast1970vette
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Posts: 1
Default 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 dont know why
both mechanics couldnt 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.
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7 22nd June 13:08
barking rats
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Default 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
___

'67BB & '72BB

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

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-- Ann Hayman Zwinger
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8 22nd June 13:08
fast1970vette
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Posts: 1
Default 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 dont really have a need
for a Parking Brake ; i just leave it in gear when i park.
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9 22nd June 13:08
barking rats
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Default 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
___

'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
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10 22nd June 13:08
fast1970vette
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Posts: 1
Default 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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