Power Brake Problem

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Mar 15, 2002 | 10:58 PM

Mil1ion

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Power Brake Problem

Jun 2, 2002 | 03:49 PM

groo

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Power Brake Problem

Hello,

I am having problems with my power brakes on my 68 F250. I just started having the problem of having to pump the pedal to get brakes and when I would come to a stop I could feel the pedal oozing to the floor. Now I am at the point where no amount of pumping will pump up the pedal and the only brakes I have are when I press the pedal all the way to the floor and they are extremely minimal. Basically, NOT driveable. I was wondering if someone could tell me if it is the master cylinder or the booster or both.

Also was wondering how to bleed the brakes. The Chilton manual says you have to do something to all 4 wheels as well as the master cylinder to bleed the brakes. Whenever I have bled brakes on other vehicles I have never had to do anything to the individual wheels only the master cylinder.

Any help would be greatly appreciated.

Thanks,
Scott

Jun 2, 2002 | 05:47 PM

Mil1ion

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Power Brake Problem

I'm pretty sure it's the M/C.

Do this test:
With the engine shut off > pump the brakes up(if you still can)hold then start the engine> What happens to the pedal?

When replacing M/C > Bench bleed it first>
It is always good to replace the brake fluid when putting new M/C on.

Then starting with the furthest brake away from the M/C bleed them one at a time.
In this order:
left rear
right rear
right front
left front.

Hopefully you don't have a Trailer brake controller.
If you do, do that too.

[font color=red]Dennis

Calgary,Alberta,Canada[/font]
[link:www.ford-trucks.com/guidelines.html|FTEModerator]

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Jun 4, 2002 | 11:27 PM

groo

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Power Brake Problem

[updated:LAST EDITED ON 05-Jun-02 AT 00:28 AM (EST)]With truck off they don't really pump up. They are, however more springly, but it feels like a spring (springy) not long hydraulic springy. When I turn on the truck there is nothing though. Should I replace the booster also or is it OK to just replace the master cylinder?

Thanks for any help,
Scott

Jun 5, 2002 | 12:18 AM

Mil1ion

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Power Brake Problem

Okay,You've checked for brake fluid ,correct?
If empty,
Check for leaks at caliper's and wheel cylinder's
If the reservoir is full,replace the M/C.
Watch which brand you buy.
If it is re-manufactures > ask if they use stainless steel sleeves in them.
Bench bleed the M/C and install.
Bleed all the wheels.
Make sure rear brakes are adjusted correctly.

Now,Check for brakes.

If you still have problems, e-mail me directly and I'll send you brake booster check instructions.

[font color=red]Dennis

Calgary,Alberta,Canada[/font]
[link:www.ford-trucks.com/guidelines.html|FTEModerator]

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[font color=red]
Please Don't Ask Me Any Tough Questions,
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[/font]

Jun 10, 2002 | 10:31 PM

groo

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Power Brake Problem

I bench bled a remanned M/C, bled the brakes like I was told and now the brakes are back like before I had absolutely none. I have to press the pedal a few times to get full brakes. When I start off again and sometime later when I want to stop, I have to pump the pedal a few times again to get full brakes.

I tried the test of pumping up the pedal with engine off and then turning on the engine. What happens is the pedal goes down about 2-3 inches.

I will say one thing though. Replacing the M/C and bleeding the brakes on this truck was one of the easiest things I have done. I was happily surprised.

From what I can deduce, It appears that the old M/C was OK. It seems as something else is the problem and allowed air into the system as well because once I bled the brakes I got brakes again like before. Only now I am back at the start.

Any help would be greatly appreciated.

Thanks,
Scott

Jun 11, 2002 | 12:15 AM

Mil1ion

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Power Brake Problem

You have e-mailed me for the booster check instructions.

[font color=red]Dennis

Calgary,Alberta,Canada[/font]

[link:www.ford-trucks.com/guidelines.html|FTEModerator]

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http://www.clubfte.com/users/mil1ion/Mil1ion.html

[font color=red]
Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]

[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
[/font]