changed my rear driver caliper tonight and after bleeding the brakes, the light came on... any suggestions? I didnt touch anything except the MC and bleed screws..
the wires on teh cap look to be in place and there is pleanty of fluid in the MC?

 

It isn't low on fluid is it?

It shouldn't come of for anything esle but low fluid.

Maybe float stuck?

 

stuck float.. hmm.. thats interesting.. I have a strut brace on that block the cap so I had to wiggle it in, maybe...........

 

Hopefully

 

nope, topped it off and made sure everything was in ok... still on

I dissconected the wires on teh top of the MC.. the light went off then

anything else?

 

Maybe bad cap.

If you unplugged and it went out then something wrong with the cap/float.

 

you think its ok to drive?
nothing is leaking..

 

Should be fine.

I believe the light is only to tell you that you are low on fluid.

 

I thought it also read brake system pressure? well i guess if the fluid is low then the pressure would be going down...
dealer should have this part in stock?

 

Not sure they might.

The EBD switch measures the pressure and is tied into the ABS.

 

There's no point for a pressure measurement in the fluid reservoir as it isn't pressurized until after it goes through the master cylinder. System is also doesn't have any pressure until the brakes are applied which would mean the light goes on and off depending on brake actuation.

 

Hello Mr. Rejeep,

Sorry to hear about such nuisance. Funny, I had a similar situation with coolant reservoir level sensor, after installing a new tank. I just took the original sensor probe off the original tank and put it on the new tank, and the low level light on the dash was on regardless of the coolant level. I concluded that the magnetic float in the new tank was stronger than the original, activating the probe from further distance than the original. I have to buy a new sensor probe as I've dissected it, about $20 for such a simple device.

Anyway, low fluid level should not cause pressure changes as Mr. info2x said, unless the fluid is absent from the reservoir. Fluid level drops according to the wear on pads, and some mechanics top off the reservoir unnecessarily.

If the float moves up & down, the circuit is shorted. A shorted circuit turns the dash light on regardless of the fluid level, as the circuit is closed all the time. I would try to take the cap off, cover the reservoir with plastic wrap and put a rubber band around it, and inspect the cap for exposed or kinked wires/metallic foreign objects, etc...

Good luck,


JPN

 

Just make sure the fluid is above the min mark on the reservoir otherwise you risk the possibility of introducing air into the system.