Master cylinder???
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Elder User
Joined: Mar 2004
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Master cylinder???
Hey yall. I was wondering if anyone could confrim my hunch that I need a new break master cylinder. My brake pedal is soft gose almost to the floor but the truck dose stop. I can pump pressuer into the peddel and it firms up but slowly sinks with constant pressuer. I dont see any leaking brake fluid, and my resivour is full, I dont think it's air in the lines because I can pump the peddel to get pressuer. I dont know about the vacume assist?? I know this truck has one but what the heck dose it do and what dose it feel like when it gose out? Thaks to any one with thoughs. this site ROCKS!!!!!!!!!!1 j 
97 f-350 cc 4x4 e4od
97 f-350 cc 4x4 e4od
Elder User
Joined: Jul 2004
Posts: 849
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From: Leesburg , Fl.
I remember reading ( but can't remember where ) that Ford is aware of this and says it's "normal" if it doesn't go all the way to the floor ??!! As for as the vacume pump.....When it fails the peddle will be hard and require extra effort to push , and a bad vacume booster will feel like the engines not running . How ever it could be leaking fluid past the piston back into the resivour
Posting Guru
Joined: Oct 2004
Posts: 2,244
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From: Morgantown WV
Originally Posted by bigredtruckmi
check master cyl. probably leaking past and / or vacuum
booster leaking air.
booster leaking air.
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Elder User
Joined: Mar 2004
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Great thanks. Ive hear this stuff about soft peddels being "normal" and I have driven way to many of these trucks to buy it. even my 150 has a firmer peddel. and my girl friends 96 psd is firm .
Thanks for all the info on vacume. i had no Idea what it would feel like if it was out. thanks for re-afirming the master cylinder . J
Thanks for all the info on vacume. i had no Idea what it would feel like if it was out. thanks for re-afirming the master cylinder . J
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
I second a bad master cylinder. If there are no external leaks and the pedal slowly sinks away under your foot, then there is a leak somewhere. If it's not coming out on the outside then it's bleeding back into the reservoir, so no fluid loss.
A sinking pedal is not normal. Eventually it will start to sink faster to the point of brake failure. Fortunatly we all have a dual master cylinder system that will at least give us two wheels to stop with until we can get them into the repair shop.
A sinking pedal is not normal. Eventually it will start to sink faster to the point of brake failure. Fortunatly we all have a dual master cylinder system that will at least give us two wheels to stop with until we can get them into the repair shop.
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FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
So, do the 94-97 PSD's use a vacuum assisted brake system? I just assumed they had the same hydro-boost system the later trucks have.
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