Rear brakes sticking lightly & Brake light comes on and off

[Ccmano]

When you look under the car just forward of the diff you'll see the cable for the emergency brake running cross the car. Follow the cable to the passenger side and you'll see a bracket that mounts it with a single bolt to the frame just ahead of the rear wheel. Undo that bolt completely and let the cable droop. This will take the emergency brake out of the equation. If the brakes still stick it either the master or something in the ABS system. Since you didn't get an ABS warning light its likely the master.
H

[staminqia]

Originally Posted by 32valvesftw

You could try loosening the brake line connection at the master cylinder for the rear, see if that losses them up, then do the same with the proportioning valve. That may give you an idea of where the issue is.
In a previous life I worked with subsea hydraulics, if this happened I would suspect a bad non-return valve, or bad actuator. We had much more instrumentation to tell us where to look though.

Ok this may be a bit too much but do you know which lines go to the rear? I dont have my service manuals yet. Also for the propostioning valve is it as simple as just unscrewing it from the front of the master cylinder? Will a bunch of fluid leak out when I do this?? This is a little out of my league.

[32valvesftw]

I would have to trace the lines from the rear caliper towards the front.
Have a look at this:
https://www.corvetteactioncenter.com...rol/index.html
After reading through that I would pull the fuse that controls ABS and traction control and see if the wheels free up. The shop that said it was the hydraulic control unit, may not have been wrong he may have just used the wrong term.

[staminqia]

Originally Posted by 32valvesftw

I would have to trace the lines from the rear caliper towards the front.
Have a look at this:
https://www.corvetteactioncenter.com...rol/index.html
After reading through that I would pull the fuse that controls ABS and traction control and see if the wheels free up. The shop that said it was the hydraulic control unit, may not have been wrong he may have just used the wrong term.

Ok now I have to find the right fuse. Wouldn't the car off release that pressure though if it was ABS?

[Ccmano]

Forgot to ask, are both rear calipers locked or just one?
H

[staminqia]

Originally Posted by Ccmano

Forgot to ask, are both rear calipers locked or just one?
H

they are both locked up.

[staminqia]

Well, I decided today to flush the old brake fluid and bleed all the lines. I did it. All new clean fluid. Then I put tires on started it and viola no light!. Took it for a spin and no sticking at a stop and no light. I hope this was the issue and it doesn't come back but for now I'm back to normal. Moral of the story here is when you get a 30 year old car flush the fluids first. That was the issue.

Thanks for everyone's help. I'll keep you all posted if it come back.

[Ccmano]

Originally Posted by staminqia

Well, I decided today to flush the old brake fluid and bleed all the lines. I did it. All new clean fluid. Then I put tires on started it and viola no light!. Took it for a spin and no sticking at a stop and no light. I hope this was the issue and it doesn't come back but for now I'm back to normal. Moral of the story here is when you get a 30 year old car flush the fluids first. That was the issue.

Thanks for everyone's help. I'll keep you all posted if it come back.

Glad you got it. Surprised that worked, but hey it's fixed!
H

[32valvesftw]

Good work! There was probably sludge fouling up something.

[staminqia]

Yes it was really dark and sludgy. Let's hope it doesn't come back. So if someone has this same problem bleed the system FIRST.

THANK YOU GUYS!