I have a 99 tahoe and when I brake a low speed or come to a stop the brake pedal starts to get soft and the abs comes on. I just replaced both front right and left abs sensors, and I'm still having the same problem.

With the truck off and pumping the brakes it does not seem like the pedel is getting as stift as it should. With the truck running I have a soft pedel almost to floor, and I don't see a leaks anywere.

The brake pads a good front and back and were not done recently.

Any tips

Thanks

I have a 99 tahoe and when I brake a low speed or come to a stop the brake pedal starts to get soft and the abs comes on. I just replaced both front right and left abs sensors, and I'm still having the same problem.

With the truck off and pumping the brakes it does not seem like the pedel is getting as stift as it should. With the truck running I have a soft pedel almost to floor, and I don't see a leaks anywere.

The brake pads a good front and back and were not done recently.

Any tips

Thanks

When you changed the abs sensors did you clean the bearing housing so there was not any rust built up? Normally the rust on the housing crates a gap that exceeds the sensor limits and causes the ABS engagemnt.

The softness of the brake pedal is most likely caused by a leaking master clyinder, remove the bolts holding master clyinder to the brake booster and look for any signs of leakage.

Hope this helps

matster cylenders can go out using fluid or not using fluid. what happens when your not using fluid is that it don't circulate. but if you do use fluid you should have seen wet spot behind master when you took it off did you see any in the booster or at the back of master cylender where the pin pushes it in from booster?

When you changed the abs sensors did you clean the bearing housing so there was not any rust built up? Normally the rust on the housing crates a gap that exceeds the sensor limits and causes the ABS engagemnt.

The softness of the brake pedal is most likely caused by a leaking master clyinder, remove the bolts holding master clyinder to the brake booster and look for any signs of leakage.

Hope this helps

I did clean the rust around the bearing housing but I will check this again. I'm going to pull the master cylinder tomorrow.
Thanks for the help

I did clean the rust around the bearing housing but I will check this again. I'm going to pull the master cylinder tomorrow.
Thanks for the help

There is a test you can do if you have a voltmeter.

Disconnect the sensor connector, hook up multimeter to sensors wires and spin the wheel hub, if you get a reading of 500mv or better sensors are ok. IF you get around 300mv sensors and hub need cleaning of rust and or wheel bearing is faulty.

Hope this helps