brakes
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Senior User
Joined: Sep 2007
Posts: 125
Likes: 0
brakes
my brake pedal is soft, i have replaced the master cylinder, power booster, both calipers, and both wheel cylinders. The problem is that replacing all of these things still makes the peal soft, could i need to bleed the brakes yet again, i guess i could have bled them wrong.Whenever i bleed the passengers side caliper if there is a lot of air in the line a lot of air will come out, there does not appear to be any leaks to the system. should i just try to blee it agian?
Laughing Gas
Joined: Mar 2006
Posts: 1,083
Likes: 1
From: Fitzpatrick Alabama
I don't know, but I want to see what they say, cause I'm in the same boat you are. I went and bought a master cylinder from Ford and threw the O'Reilly's master cylinder away, worked a lot better, but still soft. You might want to try adjusting the back brakes out, I think that will help some
Senior User
Joined: Feb 2008
Posts: 282
Likes: 1
From: Quad Cities, Iowa
Some master cylinders can allow, during a failure, a fluid bypass. All of the components seem to be good and there will be no external leaks - yet.... The pedal will always be soft. Just a thought
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
Try pumping the brakes 3 times quickly does the pedal get hard....... could be a bad lip seal in the M/C.....
Do remember that our brake systems being vacuum operated will be good for at most 4 pumps then the vacuum bleeds off and your stuck with manual brakes...... at least until the vacuum pump recovers the vacuum in the system.
The RABs light could be low fluid or stuck float in the reservior. Also check the M/C electrical connector is connected securely.
Please put up a truck info Signature..... gets boring looking up people profiles ......thanks
Do remember that our brake systems being vacuum operated will be good for at most 4 pumps then the vacuum bleeds off and your stuck with manual brakes...... at least until the vacuum pump recovers the vacuum in the system.
The RABs light could be low fluid or stuck float in the reservior. Also check the M/C electrical connector is connected securely.
Please put up a truck info Signature..... gets boring looking up people profiles ......thanks
Senior User
Joined: Feb 2008
Posts: 282
Likes: 1
From: Quad Cities, Iowa
Great suggestion. How do I accomplish that?
Originally Posted by PLC7.3
Try pumping the brakes 3 times quickly does the pedal get hard....... could be a bad lip seal in the M/C.....
Do remember that our brake systems being vacuum operated will be good for at most 4 pumps then the vacuum bleeds off and your stuck with manual brakes...... at least until the vacuum pump recovers the vacuum in the system.
The RABs light could be low fluid or stuck float in the reservior. Also check the M/C electrical connector is connected securely.
Please put up a truck info Signature..... gets boring looking up people profiles ......thanks
Do remember that our brake systems being vacuum operated will be good for at most 4 pumps then the vacuum bleeds off and your stuck with manual brakes...... at least until the vacuum pump recovers the vacuum in the system.
The RABs light could be low fluid or stuck float in the reservior. Also check the M/C electrical connector is connected securely.
Please put up a truck info Signature..... gets boring looking up people profiles ......thanks
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Junior User
Joined: Nov 2007
Posts: 65
Likes: 0
From: ansonia
my pedal bleeds down if i hold it, but my brakes always work ok,and my rabs
light is on all the time. if i pump my pedal it gets hard, with low brake power.
__________________________________________________ __________________
89 ford f250 4x4 7.3 5 speed stacks
light is on all the time. if i pump my pedal it gets hard, with low brake power.
__________________________________________________ __________________
89 ford f250 4x4 7.3 5 speed stacks
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
If the pedal is sinking to the floor and there is no fluid leaking anywhere, most likely the fluid is bypassing the piston inside the master cylinder.
I had a run of bad mastercylinders a while back.
I found that if you fill the master cylinder with fluid and pump it all out in a container before you install it, you may flush out metal filings from the machining process that were not removed before assembly.
If they are left in the master cylinder, they cut the seals up in a very short time.
Quality control is not whay it used to be on replacement parts.
I have taken parts out of the box that were worse than the ones they were to replace.
I now pay a few dollars more and get parts with a life time warranty if it is available.
That way I am only out my time to swap the parts.
I had a run of bad mastercylinders a while back.
I found that if you fill the master cylinder with fluid and pump it all out in a container before you install it, you may flush out metal filings from the machining process that were not removed before assembly.
If they are left in the master cylinder, they cut the seals up in a very short time.
Quality control is not whay it used to be on replacement parts.
I have taken parts out of the box that were worse than the ones they were to replace.
I now pay a few dollars more and get parts with a life time warranty if it is available.
That way I am only out my time to swap the parts.
Moderator
Joined: Jan 2001
Posts: 56,992
Likes: 2,741
From: Virginia
Originally Posted by OverEngineer
I have a different question on Braking performce. How do I start a Thread for that question? I know it would be wrong to hyjack this topic.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
Not sure about a 1/2 ton master cylinder fitting, I never compared them before.
With the way Ford used some parts on many vehicles, my guess would be it will fit.
Pistons inside may be a different diameter though.
I replaced my vacuum booster with a hydraboost from a 97 Super Duty.
Bolted right on and my 86 master cylinder bolted right on the hydraboost unit.
With the way Ford used some parts on many vehicles, my guess would be it will fit.
Pistons inside may be a different diameter though.
I replaced my vacuum booster with a hydraboost from a 97 Super Duty.
Bolted right on and my 86 master cylinder bolted right on the hydraboost unit.
