ABS and Brake light come on

Does the abs pump start running on its own when the lights come on?

[quote="Copatlarge"][quote="dennyp"]if the pump runs, you will be able to hear it. It makes a grinding type noise and makes it difficult to stop when braking.

You will probably need a good scan tool to isolate this problem. If the truck is lifted, look for stretched/damaged wires that could be intermittently losing connection. Check front wheel bearings as well

If you have ABS, there will be a yellow warning light that turns on for a bulb check when you start the engine. There will also be a hydraulic control unit or a computer module near the brake master cylinder.

Pull up on the parking brake pedal. If the light, (red light) goes off, the main cable is stretchad and must be adjusted, or more commonly, one of the rear cables is sticking and not fully retracting to pull the pedal up.

Low brake fluid can turn the red light on. If it is low, don't fill it to the top. It is low for a reason. Either there is a leak that must be found and fixed, or the front brake pads are worn and should be inspected. New pads require the caliper pistons to be pushed back into their housings. That will force a lot of fluid back up into the reservoir and will spill over if you previously filled it.

Caradiodoc

So what do you mean brake lights come on. Do you mean the lights on the dash or the rear brake lights? Get back to me so I can try to help ok.

If it's the rear brake lights coming on, you might have a mis-adjusted or faulty brake switch for the pedal.

Number 2 is the switch for the brake lights. When it happens again, pull up on the brake pedal to see if the lights go out.

It will probably need a pro to bleed the brake because there is air in abs unit. He'll have to hook up scanner to open abs up with that and then shut the light off. Only a scanner will turn it off.