Thursday, October 6, 2011

Why is brake light always on?

I own a 1992 Asuna Sunrunner. The brake light is always on and we checked the vacuum going to cylinder. What could be the common cause for this? We already bleed the brakes more times than you can imagine. Never changes. Anybody that knows these vehicles very well please send posts here.



Thank you
Why is brake light always on?
check the brake light switch on top of your brake pedal for being bad or out of adjustment, sometimes they just stick also.
Why is brake light always on?
Do you mean the Vacuum line to the Brake Booster Chamber? That has Nothing to do with the Brake Light. Forward of the Brake Master Cylinder there is a %26quot;Brake Differencel Valve (Looks Like a %26quot;T%26quot; Block) with two brake lines and a wire in the center, that's the Switch that turns on the Brake Light, There is also one at the Reservoir that monitors the Level. Check both to see if the Wires are Broken, Float in the reservoir to make sure it is working Properly, if light still on you may need to Remove the %26quot;T%26quot; Block to Clean and recenter the %26quot;Shuttle%26quot; that activates the Switch, Then Bleed the System again.
dont know these vehicles at all.

but from experience with brakes for many years,

Possibilities could be..

Low level float in the master cylinder could be stuck down.

A light tap on the side of the reservoir can make it free up and float back up to the top.

I assume you have the fluid at the proper level.

Also ,maybe the parking brake warning lamp switch is faulty keeping the light on.

Yet another ,the proportioning valve is not centered causing unequal pressures in the system and keeping the light on.

Yet another,low level switch faulty.

Bad master cylinder.



Just some thoughts..hope it helps you.



Where is this vehicle sold? Never heard of it.
Sorry I don't know these cars, but you might check the pressure sensor on the master cylinder. Also, if the switch for the parking brake is stuck closed, or if the ABS Speed Sensor or module have failed, it could have caused these symptoms.
try the brake pedal, when you push the brake pedal in, it releases a %26quot;button%26quot; which activates the lights, this button

might be stuck in the out position. Or it might be broken,defective.
check your brake fluid....they have a censor in there and when the fluid is low it will stay on
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