Speedometer intermittent and ABS/Brake light stays on

Has the master cylinder been replaced?

ABS and Brake warning lights intermittent may be caused by a failing wheel speed sensor(ABS Sensor) and /or its connector. You may have one on each wheel hub(4WD) or if 2WD, a sensor may be on the rear axle differential center.

scan for codes first. sounds like a shorting wire. has vehicle been lifted?

you have an code stored in the abs module.likely a bad rear wheel speed sensor.as it runs the speedometer.check wiring to the sensor.it is located on the top of the rear diff housing.hope this helps.

ABS LIGHT ON AS WELL?IF SO..I WOULD LOOK AT ABS SENSOR IN REAR DIFFERENTIAL..GETS SPEED SIGNAL FROM THIS SENSOR AS WELL..USES ONE IN TRANS FOR TRANS SHIFTING

I had the same problem with ABS light and speedometer, I was told that it is the transmission control module. It has not yet stopped shifting but I have had times where it just wont stay running. It will start and then stall. Hope this helps.

The first place I would do is check the battery cables, both ends, then check that the body to engine ground cable is intact. Back in the 70s and 80s, Volkswagen Rabbits, Audi Foxes, used a negative cable that ran from the battery to the left fender to the engine. Every once in a while, one came in on the hook or limped it with an intermittent body accessory problem, or frozen speedometer or throttle or clutch cable. In every case, somebody had replaced the negative battery cable with a conventional cable so there was no body ground connection except through the throttle, speedo or clutch cable. these could not carry the body current demand and eventually melted or welded into the cable casing.

Replace the speed sensor in the rear end.

See if you can find out if there is a code for the check engine lite and the abs, those can be related if the speed sensor located on the top of the rear axle is intermittantly failing. That sensor sends the speed signal to the pcm and the abs controler witch will also turn off the cruise control.

No definately the speedo....