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Brake warning light problem

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Old 07-10-2018, 03:04 PM   #1  
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Join Date: May 2011
Posts: 30

Brake warning light problem


I have a 86 transam, with hydroboost, SSBC 1LE front brakes, rear standard disc brakes, 4th gen master cylinder, new hoses...

Everything worked fine for a lot of miles, about 2 years....

But today, when I pushed really hard the brakes, the warning brake light came on the dash.

And now it comes on everytime I brake... it goes off everytime I release the brake pedal !

I never had this problem before... If it would stay on, I would understand a proportionning valve problem.

The car stops good, but this light fears me...

There is not any leak in the system.

Thanks For your help !

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Old 07-10-2018, 10:04 PM   #2  
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Join Date: Dec 2012
Location: northern VA
Posts: 1,262
Car: 88 Sport Coupe Camaro
Engine: V6 2.8
Transmission: Borg-Warner T-5
Axle/Gears: RPO/GU6: 3.42

Re: Brake warning light problem

Your combination/proportioning valve has shifted just enough that the valve activates the warning switch when pressure is applied to the braking system.

I recommend that you first bleed the entire system. There is some chance that bleeding the system may put the problem to rest. In any event, my opinion is that bleeding the system is the first thing you do when hydraulic issues appear.

Once the system is bled, and all air is eliminated from the lines, you need to reset the combination/proportioning valve. Folks have different ideas on how this is best acccomplished. One good way of doing it is posted at
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