ABS LIGHT ON hardly any brake pedal

[2011Supercab]

If the front rotors are warped it can also cause a low pedal on first push of the pedal.

 

[pentode]

If there were air in the system... the pedal would always be low. It's not something that would be fine this time and not fine the next the brake pedal is applied.

..........

The only thing I've ever seen that will allow the brakes to work fine this time and go to the floor the next is a master cylinder.

My impression from the OP was that the brakes varied between bad and worse.

If sometimes they're decent and randomly bad, I've seen master cylinders do that too. I just didn't want to go there as a first step but it's definitely a strong possibility.

I also agree about getting the codes if possible. Anything with a computer, it's always a good first step, it just takes a pretty good scanner to get the ABS codes. The brake adjustment and a quick bleed I figure are cheap and easy if the codes aren't readily available.

 

[Uncle Gump]

If the front rotors are warped it can also cause a low pedal on first push of the pedal.

While that is true... the customer shows up saying my brakes are pulsing. Not my pedal is low.

 

[2011Supercab]

While that is true... the customer shows up saying my brakes are pulsing. Not my pedal is low.

When you hit the brakes and the pedal goes to the floor, you pump them and they start working,

What is your first complaint to the mechanic going to be, remembering you just had the crap scared out of you?
1. pedal going to the floor.
2. pedal pulsing when stopping.