Question about 1990 Toyota 4Runner

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We bled the breaks...why is my break light still on?

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By bleeding the brakes you cause uneven pressures in each half of the dual hydraulic system. Therefore, the sensor switch that detects this pressure imbalance has operated and will remain set as indicated by warning light. The switch is either located on the side of the Brake Master Cylinder or on the proportioning valve on the firewall.
To reset detecting switch, first disconnect wiring plug (Light should go out with plug disconnected) and remove switch. You may hear a click as the pressure difference piston resets as you remove the sensing switch. Pump the brake pedal a couple of times to ensure piston has reset and then replace switch and wiring connector.

Posted on Oct 25, 2010

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