I had a frozen passenger side caliper a week or so ago. I replaced it with a caliper from AutoZone this past weekend. I then proceeded to bleed the brakes using the 5 presses and stop method. I also changed out both front pads and rotors while I was doing this.

The problem seems to be that after initially bleed the brakes they are perfectly fine. Once I start the truck the brakes become very spongy. The truck seems to stop just fine however I do not like the feel of the brakes.....feels unsafe.

I tried the adjustment of the rod behind the MC but I get the same result of firm brakes until I start the Truck. Did I forget to do something or am I missing something completely with this truck?

 

Did you bleed both fronts? Any time I open a brake line I bleed the whole system.

What is the 5 pumps and stop method? Maybe your bleeding procedure isn't right. Did you re fill the master, could have gulped some air if you didn't. IDK.

 

Bled all 4 actually.

Pump the brakes 5 times then hold. Just another way of saying I manually bled the system. I filled the master after i finished bleeding the system.

 

Sounds like you have some air in the system somewhere. Did you use a piece of hose between the bleeder and a jar with some brake fluid in it so you didn't suck any air back in? Just a thought.

 

what do you mean "pump five times and hold"???????
you have to just push the pedal down once and then close the bleeder valve, then release the pedal, open the bleeder valve, and repeat.

You can't pump the pedal with the bleeder valve open or you will suck tons of air in.

Also, the reason your pedal feels hard with the engine off is you have depleted the vacuum in the booster with your brake pedal pumps. When you start the engine you suck the air back out of the booster, thereby giving you boost and letting you feel how soft the pedal really is.

Sounds to me like you need to take this somewhere and have it properly bled.
And then have them fix your booster output rod so you don't have dragging brakes.

 

A friend pumps the brakes five time then holds. i open the bleeder valve let air out then close the valve. I know not to pump the brakes with the valve open. Its the way I always bled the brakes but on this truck it seems not to work for one reason or another. Some people pump once some do 3 times...same difference to me.

This has been resolve as there was air in the ABS line somehow......

 

Glad you got it, it did seem like an air in the line issue.

 

If I read this correctly, you bleed the system and "then" add replacement fluid? Maybe I am reading this wrong, but you have to keep adding fluid to the brake reservoir unless you have one of those inverted deals to add it for you. If you let that brake fluid drop below the "Min" line, your system will be sucking in air...

If everything else is indeed done by the book with no air in the system, you may want to inspect your brake lines for problems...