ABS kicking in prematurely after a tire change

Hey all,

I had a duratrac go flat on me after getting a bolt stuck in it-- replaced just the single duratrac tire and moved it to the rear of the car. The rest of the tires are at about 75% tread, while the new one is...well... new.

Now my ABS kicks in all the time, even with medium intensity stops. The pedal sinking to the floor is scaring the crap out of me-- it's only a matter of time before i get into big trouble. Any idea if the new tire being a bit larger is going to be a problem?

Do i need to replace both tires, even though the difference is relatively minimal? Thanks in advance for the help!

 

If your brake pedal is going to the floor, the problem aint your tires.

If you don't know how to check your brake system, find someone who does.

 

It's not a master cylinder issue-- I'm just describing the abs kicking in as having the pedal sink to the floor. You definitely feel the pulsating you would with the ABS kicking in.

No leaks in the system

 

Make sure the new tire is identical in size, load range, and tire pressure. The difference between 75 and 100% tread depth isn't that much.

 

impossible. changing tires cannot cause this. You damaged Something. like a previous poster said, if you dont know how to check take it to someone who does before you get yourself hurt.

 

Maybe bleed the brakes? I had that problem only once in my trucks history...never happened again. Its surely NOT from your tire.

 

Why would you describe the ABS Activation as the " Pedal Sinking To The Floor ". That makes no sense.

I agree with the above. It isn't the new tire...

 

I agree completely.

Maybe he's used to a mid-90s General Motors... it was normal for their ABS to dump the pedal for no apparent reason.


OP... tire went flat from a bolt... did the tire come apart and possibly damage the brake line?

 

Sinking to the floor... bad choice of words. I've got that much haha

Had a look at the brake lines and they all look to be intact with no leaking. Followed them back to the resivoir and that looks good too-- no bubbles forming at all. Brake master cylinder is good.

I'm going to try to pull the abs/tire sensors and spray some electronics cleaner on them to see if that'll help.

If it's any help, ABS only seems to be kicking in when I'm on an incline. Thinking back on each time it happened, I was on an onramp or offramp with a moderate incline. I'm on these ramps pretty often though, and this problem didn't start until after I had changed tires.

Thanks again everyone-- if cleaning the sensors doesn't work, I'll bleed all the brakes again to see if any bubbles have formed