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Old 04-09-2013, 07:16 PM
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Break Issues

Ok 95 E350 cut away. 7.3turbo, The breaks do essentially nothing. If i just barley ride them at the top of the throw the kind of bite a little. but as soon as i apply any more pressure they go down and then the pedal gets hard and i get no breaking. If i hold it down like that for a while (5-10 seconds) the break light comes on. the really weird thing is If i have the pedal down and shut the bus off it rises back up. and not just the normal pedal return. it comes up with furry. It pushes back up hard!
Here is the list of break parts replaced in the past 12 months,
Both front calipers,
Over sized (super duty) master cylinder,
Booster,
RABS,
Vacuum pump,
rear right drum piston
most lines.

(I was chasing the legendary sinking pedal)


I have the rear left piston gonna put that in tomorrow. but any ideas. this rising pedal is really odd.
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Old 04-09-2013, 08:05 PM
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The sd uses a hydroboost brake, the 94.5-97 f250-350 have vacuum booster, and the f-sd has hydroboost as well, what EXACTLY do you have? Sounds like a vacuum leak but the rising pedal is an odd one
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Old 04-09-2013, 08:11 PM
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yes they do have hydro-boost...however the older 450's did not....
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Old 04-09-2013, 08:31 PM
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Do you have hydroboost is the question the older 450's do have hydroboost, there is one in my garage on the shelf
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Old 04-10-2013, 04:37 AM
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"1997 and earlier diesel trucks equiped with vacuum power brakes--Low/creeping pedal:
Many owners have complained of a low or creeping brake pedal on their trucks, often mistaken for a bad master cylinder or Rear ABS valve. If the condition occurs after the vehicle has come to a stop, and no other brake concerns are found, (worn or out-of-adjusted brakes, ****ed pads, or hydraulic problems) the condition is normal and the result of the vacuum pump replenishing the vacuum inside the power booster. Ford has developed a Zero-Loss Travel brake booster to correct this condition if the customer finds it unacceptable. This part is only for use on diesel-equiped trucks--P/N F5TZ-2005-CA--and is not a service replacement; it must be ordered by the part number, not vehicle application.

This condition is similar to the low brake pedal concern on all 1995 F-series that required a larger-diameter master cylinder:

Trucks without cruise control:


F6TZ-2140-AB
F-250 Gas 4X2; F-350 DRW, SRW Gas 4X2, SRW 7.3 4X2 168" WB
F6TZ-2140-EB
F-250 4X4, 7.3 4X2; F-350 SRW 4X4, SRW 7.3 4X2 133" WB
Trucks with cruise control:


F6TZ-2140-BA
F-250 Gas 4X2; F-350 DRW, SRW Gas 4X2, SRW 7.3 4X2 168" WB
F6TZ-2140-FB
F-250 4X4, 7.3 4X2; F-350 SRW 4X4, SRW 7.3 4X2 133" WB
These part numbers are from TSB's 96-25-19 and 98-5A-34, and are not normal service-stock replacment parts."


At any rate, the problem is not the hydroboost. everything worked fine after i replaced all the other stuff.
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Old 04-10-2013, 04:43 AM
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That was a summarized version of TSB #98-5A-34
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