brake light

[stock91w350]

well i unplugged the abd box and got rid of the abs light but the other brake light is still on, if i stap the brake pedal hard and fast it goes out till it is pushed down again normaly, about half way down it come back on.

[cougar]

Shuttle valve off center?

[dpuckett]

Shuttle valve? Never heard that one. Not to say it doesnt exist, it's just a new one on me. Either way before my time, or well after 93.

I'd think parking brake pedal not fully retracted, or low vacuum (though if your heat vents change as they should, and you have any sign of brake assist, I'd rule that one out).

You could remove the bulb, too.

[PToombs]

Dan, he means that silver widget below the master cylinder. I call it a proportioning valve, but that may be incorrect.
It sounds to me like that is the problem too. Equal brake pressure keeps the shuttle in the middle, and the light out. When you blow a line, the shuttle moves, and the light comes on. You sometimes have to bleed the opposite end to move it back and get the light to go out.

Or you can unhook the wire.

[Richie O]

If it is that valve it won't flow fluid to all 4 corners. Usually a heavy stab on the pedal with the opposite bleeders open will make it come around.

[stock91w350]

I uplugged the wire going into the parking brake but it still on.

[stock91w350]

Dan, he means that silver widget below the master cylinder. I call it a proportioning valve, but that may be incorrect.
It sounds to me like that is the problem too. Equal brake pressure keeps the shuttle in the middle, and the light out. When you blow a line, the shuttle moves, and the light comes on. You sometimes have to bleed the opposite end to move it back and get the light to go out.

Or you can unhook the wire.

what wire do i unhook?

[2stroke]

try unplugging the low vaccum switch.

[stock91w350]

try unplugging the low vaccum switch.

where is that located?

[2stroke]

driverside fender well. should have a single vaccum line comming out, and a single electrical connector.

[PToombs]

I was talking about the wire on the valve below the master cylinder. There may be other issues causing the light to come on.

[stock91w350]

driverside fender well. should have a single vaccum line comming out, and a single electrical connector.

I found it, unhooked the connector and light still on, maybe time to just take the bulb out, lol

[stock91w350]

I was talking about the wire on the valve below the master cylinder. There may be other issues causing the light to come on.

how far below the master cylinder is it? couldent find it, anyone have a picture of it for me to see? thanks

[dpuckett]

On your 91, it's not below the master cyllinder- it's on the inner frame rail, driver's side.

[PToombs]

ah HA!