Hi friends.
Need to bring up my post count here.

1999 expidition XLT Bauer.
Hopped in and my brake pedal stuttered abit.
Pushed down and it was not soft but skipped a little.

I've only had the rig 24 hours but it just happened twice.

Good looking rotors but have no idea on pad health.

Any ideas or suggestions?

Thanks

 

Stuttering / Pulsation in the brake pedal is normally a sign of a warped rotar(s) or hard spots that don't wear down even with the rest of the rotor surface. This causes the caliper to pulse in and out. I'd slap new rotors on all four corners with new pads for everybody and call it a day.

 

Honestly it's not that. It feels like is the pedal only.
Imagine the pedal having a hydrolic cylinder that's losing fluid.

The pedal stuttered but had absolutely no affect on the breaks until I was on the floorboard.

Felt like fluid loss but I have no leaks and all rotors look great.

Having fixed my own cars for 20 years...I can't really explain it.

 

It may be Master Cylinder time!
Time to replace it that is.
Especially, if someone recently opened the hydraulic system and used the manual method to bleed the system. What happens is; when bleeding they open the bleeders and the pedal goes to the floor and the piston cups in the master cyl now get scored by the accumulated crap in the bore of the master cyl. Once scored they don't seal very well and fluid gets past them and the pedal now shows a problem.

 

Now that sounds reasonable.
That's the problem buying undocumented used cars. You just don't know what's been done.

It stops alright but the stutter is really intermittent.
2 times a day maybe.

 

The circumstances being what they are , it might be a good idea to check the wheel bearings. I know you stated it might not be as Use Common Sense suggested,but there may be more here than "meets the eye".

 

All in the works. Trying to pick my battles being I've had the car for a total of 48 hours.

I appreciate the input.

 

While you are checking the wheel bearings check the wheel speed sensors. One of them may be sending a signal to the ABS system of one of the wheels appearing to stop faster than the others.