[Virginia Eddie]

Replaced the master cylender, front calipers, rear wheel cylenders, pads and shoes, speed sensor on the differential, abs module on a 05 Dakota. Still have abs and brake light on dash, abs scan tool says low brake fluid. Switch ohms out good. Wire to switch on master cylender has ground but no power. What should I check next?

 

[radioactive]

You should be able to measure at least some pullup voltage on one switch wire. Trace it back to the ABS module or whatever controller it goes to. Either the module has gone bad or the wire is open.

 

[Virginia Eddie]

I have 4.9 volts DC at the switch on the master cylender. Replaced the module at the back of the fuse box, cleared all codes, light on dash still on. Scratching my head, what could be the problem?

 

[radioactive]

Your first post said no power, but now you have 5 volts?

Does it go to 0 when you move the float switch? Or the opposite -- does it go to 5 volt when you move the float?

Need a little clarity. Need to trace those wires if you haven't already.

 

[Virginia Eddie]

Ohmed out the switch, circuit is open with brake fluid in the master cylender, switch closes when fluid is drained. Traced the wire back to the abs pump, no breaks in the wire. When I said no power, I ment the test light doesn't light up when probed, checked with volt meter at the abs module and then at the switch on the master cylender to get the voltage readings. Ground is good at the wire at the master cylender switch. I hope this clarifies the information.

 

[radioactive]

It does somewhat but I'm at a loss to help you troubleshoot any further over the interwebs.