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2/9/13 2:30pm - Original Message: 'Parking Brake Light'
rep69
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Chesapeake, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 130
My 1969 parking brake light on the instrument panel will not go out. When you pull up on the handle the light gets brighter. I do not notice any dragging or noise from the brakes. I checked the master cylinder and the front half was full of fluid and the back half was 1/2 full. I filled up the rear half and drove car again.  The light stayed on.  Brakes feel good, pedal is firm. Any suggestions? 
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2/10/13 12:05am - Reply: 'Re: Parking Brake Light'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
It sounds like the light is being turned on by the proportioning valve, not sure of location on the 69 it should be a gold looking block where the rear and front brake lines meet. it sets when their is unequal pressure between front and rear brakes. you may have a leak in the rear. if the brake pedal feels good you might try giving a hard quick push on the break pedal to get it to reset.


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Bob R
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2/10/13 11:24am - Reply: 'Re: Parking Brake Light'
dyoes
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Zachary, LA - USA

Vette(s):
1974 L-48 Auto. Just your basic Vette. GM crate motor w/vortec heads and intake. Crane cam. Scorpion rockers, Edelbrock carb. Lots of parts still in boxes... :(

Joined: 1/27/2013
Posts: 201
Bob is right on. You also may try bleeding the brakes in sequence (rear first, then front), then pressing the brake pedal hard for a few seconds.

I'd guess you have a leak somewhere in the rear, like Bob mentioned (either a caliper or a line). The light getting brighter is the switch under the parking brake, it provides the ground for the light bulb. The prop valve switch does the same thing. That's telling me you have two sources of ground for the light bulb circuit: one from the proportioning valve, the other from the eBrake switch.

Best of luck.

~~~Save the Wave~~~

|UPDATED|2/10/2013 8:24:20 AM (AZT)|/UPDATED|


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2/10/13 12:03pm - Reply: 'Re: Parking Brake Light'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Or....it could be the wiring has a short in it somewhere. Disconnect the wire at the proportioning valve, and see if the light goes out. If it does, the problem is with the p-valve. Either it has flipped to one side, or it is shorted internally.
If the light does not go out, the problem is elsewhere. Could even be the p-brake switch itself. Disconnect that, and see what happens. If you have both the p-brake switch and the p-valve disconnected, and the light stays on, then you'll need to dig into the wiring. Unhappy


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2/10/13 3:04pm - Reply: 'Re: Parking Brake Light'
rep69
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Chesapeake, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 130
I will check into the wire connection and try to isolate the problem.   If I need to bleed the system I will let my mechanic do the job. I have heard that bleeding the brakes on the C3 is not easy.
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2/17/13 11:06am - Reply: 'Re: Parking Brake Light'
rep69
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Chesapeake, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 130

I had my mechanic look at the car and he determined that the master cylinder has a small leak. I will be replacing  it  and hopefully this will fix the problem

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3/2/13 4:32pm - Reply: 'Re: Parking Brake Light'
rep69
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Chesapeake, VA - USA

Vette(s):
1969 convertible 427 4speed

Joined: 7/24/2012
Posts: 130
Update on the repairs.  The master cylinder did have a leak. It was replaced last week.  Drove car home from shop and everything worked normal. Drove car today and at first the light was out.  The light came back on after driving the car a few miles.  Same indication.  light on all the time. If you pull up on the brake handle the light get brighter.  Maybe that valve or wiring?? 
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