97 F150/auto/4x4

In the 5 years I've had this truck, this has happened 3 times.
I had the Brakes Bled and checked by a reputable shop since the 1st time.

In a Panic stop, I jamb down the pedal and the truck slows rapidly, almost to a stop, but the wheels don't skid and I don't feel that Computer 'surging' unless I'm on Gravel. The Pedal feels good and hard.
It acts like there is Air in the system!

I was lucky to have a place to go, to avoid an accident.

Is there a Bleed port up on the Power brake cylinder? There is one on a Chrysler van. Can't find one on my pickup.

 

You might try readjusting the rear brakes if they're drum not disc.

 

Yikes!
I better look at them back brakes. There might be more problems to see if that's the case.

 

Yep, if ye think gettin' 'er going is important, just wait til ye cain't get'er to stop!

 

Its probably your old rubber brake lines ballooning. Try some SS lines.

 

Yep, I had a Rubber b rake line split during a Panic stop with my Diesel pulling a 5er.
That was exciting!

I'll have to get a buddy to get under there with me. And somebody up top to stomp on the brake when I yell at her