'91 Navajo brake problem | Ford Explorer - Ford Ranger Forums - Serious Explorations

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'91 Navajo brake problem


New Member
October 30, 2011
Reaction score
Year, Model & Trim Level
1991 Mazda Navajo
I have replaced the pads and shoes on this truck. Also the brake master cylinder. And I have bled at all 4 wheels multiple times. If the truck has been sitting, the brake pedal is good before starting the engine. Upon cranking the truck, the brake pedals sinks almost to the floor. This truck has rear ABS. I suspect the power boost but I am a beginner. Any suggestions?


Well-Known Member
October 25, 2009
Reaction score
City, State
Staley, NC
Year, Model & Trim Level
94 Explorer 78 F150
Pull the hose off the booster and plug the hose with something to prevent a major vacuum leak. Start the truck and repeat your brake pedal pushing to see if it still happens. If it no longer goes to the floor, chances are your booster is shot.