no brakes

[greenskeeper]

99 F250 PSD with hydroboost. Brake pedal goes to the floor with no resistance.....brakes work very little at the bottom of the travel (at the floor).
No fluid leaks....Master cylinder or ?
Power steering works fine whether on the brakes or not.

 

[79jasper]

Could be the master. Rear drum or disc?

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[greenskeeper]

Could be the master. Rear drum or disc?

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disc brakes

master cylinder reservoir was empty, filled and same result....no time to try bleeding tonight.

Pumping the brake pedal with the engine OFF builds no pressure. Holding the pedal down and cranking the engine makes the pedal drop and then come back up against my foot. Also pushing the pedal to the floor I can hear the PS pump working harder and when I let up the pedal pushed back against my foot with the engine ON.

 

[greenskeeper]

nothing trying the bleed the brakes....going to test master cylinder tomorrow with port plugs.

 

[79jasper]

Chances are the master then. If no signs of leaks on any of the calipers, look closely around the hydroboost to MC mating.

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