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brake failure light 200 1981

posted by  B.C. on  Wed Dec 29 14:38 CST 2004
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last visit: Wed Mar 28 22:28 CST 2012
[RELATED]

As mentioned below, the brake faiure light is triggered when there is a difference in fluid pressure between the two dual-diagonal brake systems.

So either there really is a pressure difference, or the switch is lying. With a 1981 anything, My bet would be 50/50 either way.

Find the brake distribution block. It is at the bottom end of the two lines that come out of the master cylinder. That block looks a little like an octopus, having eight brake lines and one harness attached.

Look for signs of leaking. WHen they leak it often looks like the leak is at the wiring harness attachment. NOT.

Inside the block is a piston, each end in one of the two brake circuits. If the pressure in one circuit is less than in the other the piston moves and the light comes on.

Things that cause pressures to differ are many. Another thread. Check for that leak.

Good Luck,

Bob

:>)
--
240s: 1986 244GL, 1988 244GL, and 5 others.






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