My red Brake light just came on. What is the Culprit?
#1
Team Owner
Thread Starter
My red Brake light just came on. What is the Culprit?
I bought a new Master Cylinder since mine was from 1974. Is there anything else that I should look at fixing/repairing as well. Before the light came on the braking was very poor and you had to push the pedal almost to the floor to get it to stop. There was no real "Bite" to the brakes.
Thanks for the help......
Thanks for the help......
#2
Le Mans Master
I bought a new Master Cylinder since mine was from 1974. Is there anything else that I should look at fixing/repairing as well. Before the light came on the braking was very poor and you had to push the pedal almost to the floor to get it to stop. There was no real "Bite" to the brakes.
Thanks for the help......
Thanks for the help......
2nd is a pressure differential being detected between the front and rear brake circuits. There is an electrical switch located on the brake distribution valve next to the master cylinder. If a leak should develop in one of the calipers or a line in the front or rear circuit, pressure will be lost on that circuit and the valve in the distribution block will be forced toward the lower pressure side and activate the switch on the distribution block. This will in turn illuminate the brake light.
Considering your comments in the above post, I would be examining the brake calipers and looking for a leak somewhere.
You also didn't mention, but do you have power or non-power brakes?
Good luck... GUSTO
#3
I bought a new Master Cylinder since mine was from 1974. Is there anything else that I should look at fixing/repairing as well. Before the light came on the braking was very poor and you had to push the pedal almost to the floor to get it to stop. There was no real "Bite" to the brakes.
Thanks for the help......
Thanks for the help......
#4
I bought a new Master Cylinder since mine was from 1974. Is there anything else that I should look at fixing/repairing as well. Before the light came on the braking was very poor and you had to push the pedal almost to the floor to get it to stop. There was no real "Bite" to the brakes.
Thanks for the help......
Thanks for the help......
You have air in the Master Cylinder, once you fix this up you will need to bleed each caliper again.
Read my post
https://www.corvetteforum.com/forums...gy-brakes.html
#5
Easy way to tell the difference between the parking brake or regular brakes is to unplug the wire at the proportional valve. If your dash light stays on, its the parking brake. If the light goes out, its the regular brakes. Good luck.
#6
Le Mans Master
I always use this tool when bleeding the brakes on my C3. It keeps the valve centered in the prop valve when bleeding the brakes. Take the tool out after you are finished. Replace the light switch and your done. No more pesky brake lights. It costs less than $10.
#7
I bought a new Master Cylinder since mine was from 1974. Is there anything else that I should look at fixing/repairing as well. Before the light came on the braking was very poor and you had to push the pedal almost to the floor to get it to stop. There was no real "Bite" to the brakes.
Thanks for the help......
Thanks for the help......
The following 2 users liked this post by NewbVetteGuy:
SPCL FX (07-17-2017),
SpeedRacerMach (07-17-2017)
The following users liked this post:
SPCL FX (07-17-2017)
#10
Will this help if the air is in the MC ?
#12
Advanced
Thought to post this here since the thread is fairly new and this just started happening this weekend. 1979 with 26,000 miles, excellent very well kept all original car. I purchased it in March from the second owner in Grand Rapids, MI and now it's in San Antonio, TX. The (original) calipers began to leak so replaced all four back in April. Driving the car in this weekend the brake light will go on after driving a while and braking from a relatively high speed 55+. Checked everything and there are no leaks. Check MC and full fluid. After I check the MC and start the car the light goes out, and stays out for a while until sporadically it lights again when I brake. What should I be looking for? I was told by some friends with C3's that it's probably the MC starting to go (age?). Thoughts?
#13
Burning Brakes
Duane
The following users liked this post:
SpeedRacerMach (07-17-2017)
#15
Instructor
As Long as you are not finding leaks and no fluid loss it is just a matter of resetting the valve. Jolt the brake pedal a few times with the car off and should reset the valve. Check the inside of your wheels/tires for any leaks, also at the back of the MS to see if it is damp. Sometimes it will leak into the booster. Brake Fluid Drys pretty quickly so maybe check it an hour or so after parking it. May have some air in them.
Last edited by JayRay; 07-18-2017 at 01:52 AM.