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#1 |
Registered User
Join Date: Mar 2010
Location: San Jose, CA
Posts: 76
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The red brake warning light on my speedometer is on when the ignition is on and car is running. I read in the manual that it is due to the proportioning valve reacting to un-even presure b/w front and rear, and that it is usually due to air in the system. Yesterday I bled the brakes but this did not have any effect, the warning light is still on.
I have only had the truck a couple of weeks so don't know what the brakes should feel like but they do not inspire confidence. I did stamp on the brakes to see if I could lock them up but no dice. Just wondering what my next step should be and how to move forward to resolve the issue ? Any input would be appreciated. Thanks
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![]() ![]() ----------------------------------- { 1972 Chevrolet C-10 Fleetside, 350 V8, 5.7L. } ----------------------------------- |
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#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Brake Warning Light
theres a pin on the prop valve its under a rubber bulb looking thingy// that pin must b clamped in when bleeding the brakes
that should turn off the light if the light comes back on take off the rear drums and inspect for signs of leakage and check the shoes while you're at it
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#3 |
Registered User
Join Date: Mar 2010
Location: San Jose, CA
Posts: 76
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Re: Brake Warning Light
I did use a C clamp to hold in the rubber button on the front of the prop valve when I was bleeding it. I took a look at the pads on one side and they were still good and no leakage. I guess I will check the other side as well just to make sure.
Why check only the brake shoes at the back and not the pistons at the front, does the light indicate an issue only with the rear brakes ? Thanks
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![]() ![]() ----------------------------------- { 1972 Chevrolet C-10 Fleetside, 350 V8, 5.7L. } ----------------------------------- |
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#4 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Brake Warning Light
rear brakes r the most neglected from what i've seen over the years and the cylinders seem to leak far more often than the front calipers
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#5 |
Registered User
Join Date: Mar 2010
Location: San Jose, CA
Posts: 76
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Re: Brake Warning Light
Many thanks for explaining. I guess I will check the back first and if I don't see anything will check the fronts.
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![]() ![]() ----------------------------------- { 1972 Chevrolet C-10 Fleetside, 350 V8, 5.7L. } ----------------------------------- |
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#6 |
Registered User
Join Date: Aug 2005
Location: Pasadena,Tx /Pto Pta DR
Posts: 5,415
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Re: Brake Warning Light
You can take off the electrcal connection. Its threaded and make sure the groove on the shaft is centered in the opening. If not your light will stay on
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#7 |
Registered User
Join Date: Mar 2010
Location: San Jose, CA
Posts: 76
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Re: Brake Warning Light
Finally got time to check around all the brakes and none of them were leaking. I re-bled all the brakes and it was pretty cloudy. After this I went for a few drive and the brake warning light was off. After 5-6 drives it has started to come on when I brake but off again after I remove my foot from the brake pedal.
I think I have pretty much flushed out the old fluid so what should the next step be ? Thanks Jay
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![]() ![]() ----------------------------------- { 1972 Chevrolet C-10 Fleetside, 350 V8, 5.7L. } ----------------------------------- |
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#8 |
Registered User
Join Date: Mar 2010
Location: Pueblo West, CO
Posts: 944
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Re: Brake Warning Light
I had the same problem and it ended up just being loose. I took the rubber boot off and tightened the nipple. No problems since.
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67 C10 Stepside 66 Mustang Coupe 99 Burb 2500 |
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#9 |
Registered User
Join Date: Mar 2010
Location: San Jose, CA
Posts: 76
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Re: Brake Warning Light
Many thanks for the reply.
I did remove the brake warning light sensor from the combination valve and took a look. I cleaned up the thread and made sure the little circular gromet was in place. Also took a look inside the combination valve cavity and saw a little hole at the bottom. When you say you need to line it up, are you talking about the end of the sensor into the hole at the bottom of the combination valve cavity ? I guess I do not really understand what you mean by lining it up as the sensor screws in so there is no way to move it.
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![]() ![]() ----------------------------------- { 1972 Chevrolet C-10 Fleetside, 350 V8, 5.7L. } ----------------------------------- |
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