trinityracing

Lost my brakes on my superduty. Are there any known issues with booster pumps/power assist brakes failing? Pedal wne to the floor, no e brake, had to jam tranny in park. Who knows what damage was done. Almost crashed into another vehicle. Did damage to my truck and trailer I was towing. Has anyone ever heard of this? is Ford laible? suggestions?

thefonz

I'm not positive, but I think when the booster fails, the pedal is hard. Usually when the pedal goes to the floor, you have a leak in the system. Have you checked the brake fluid? Master cylinder is another possibility.

trinityracing

Fluid level is fine, no visual sign of leaks...

360ci

Perhaps the vacuum system has a big leak? I'm not sure how the SD brakes are configured. Power brakes get there name from some sort of driving source. Just a thought.

__________________
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!

jwko

I think if there was a bad vacuum leak the pedal would be hard to push but you would still have brakes. I would look at the master cylinder. Had a issue with my taurus with the pedal going to the floor on occasion, it was the master cylinder. Somehow the fluid pressure was bypassing within the MS but never leaked.