Brakes
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New User
Joined: Nov 2020
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Brakes
I have a question. I have an 04 6.0 powerstroke and when I slam on the brakes the pedal goes soft. But normal driving and medium brake pressure it’s perfectly fine and has great pressure. Was asking if any one ran into this same problem and asking if any one has a solution to this problem.
Post Fiend
Joined: Nov 2001
Posts: 6,748
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From: Tallassee, ALabama
Do the truck have a vacuum booster or does it have hydrostatic brake booster/assist?
If vacuum booster, I would start by checking the vacuum pump with a vacuum gauge for different petal application pressures. If low vacuum, have you noticed any other items that are operated off the vacuum having issues. I would also check to see if the brake pedal eases to the floor when the truck is parked with the engine is running and light to moderate pressure on the brake pedal.
If hydro brakes, I would start by check the power steering fluid level and hoses for leaks. With this type of brake booster, would check to see if any problems are noticed with the power steering effort, etc. I would also check the brake pedal action here as above with the vacuum booster and the pedal going to the floor.
If vacuum booster, I would start by checking the vacuum pump with a vacuum gauge for different petal application pressures. If low vacuum, have you noticed any other items that are operated off the vacuum having issues. I would also check to see if the brake pedal eases to the floor when the truck is parked with the engine is running and light to moderate pressure on the brake pedal.
If hydro brakes, I would start by check the power steering fluid level and hoses for leaks. With this type of brake booster, would check to see if any problems are noticed with the power steering effort, etc. I would also check the brake pedal action here as above with the vacuum booster and the pedal going to the floor.
