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Old 10-17-2020, 09:54 PM   #1
msstring
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Default Brake Adjustment

What is the key to bleeding and adjusting brakes? I have all new cylinders and new lines. I have blead all the lines again by pumping 3 to 4 pumps at each wheel. Going to need to get more brake fluid to do more.

Brakes are adjusted so there is just slight drag when spinning wheels. Still need about half the pedal travel and the pedal is spongy.

Any suggestions?

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Last edited by msstring; 10-17-2020 at 10:03 PM. Reason: Adding bleeding info.
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Old 10-17-2020, 10:47 PM   #2
ford38v8
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Default Re: Brake Adjustment

My '38 has mechanical brakes, but from what I remember about hydraulics, pump and release slowly to prevent bubbles, do the right rear first (farthest from MC), left front last (closest to MC). Back in the day, I used a Nehi pop bottle (clear) with the hose submerged and my helper pumped a couple times beyond the no bubbles point. I'm told that if you are using silicone fluid, the brakes will normally feel spongy. You probably know all that, but offhand, that's all I remember anyway.
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Old 10-17-2020, 11:09 PM   #3
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Default Re: Brake Adjustment

Did you Bench Bleed the master cyl, first, to remove any air in it ?




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Old 10-17-2020, 11:16 PM   #4
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Default Re: Brake Adjustment

just a thought check the master cylinder pushrod adjustment then bleed the master cylinder then all four wheels furthest first and so on If all good should wind up with 1/2 pedal play then a good pedal
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Old 10-18-2020, 06:30 AM   #5
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Default Re: Brake Adjustment

You didn't say if you had a helper that was pumping the brakes, holding the pressure and then you quickly opening the bleeder valve ; then closing it quickly. What exactly did you do? Lots of help on the net about this. You can do it by yourself too, but need suction or pressure devices to do so.


https://www.caranddriver.com/feature...d-your-brakes/
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Old 10-18-2020, 08:56 AM   #6
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Default Re: Brake Adjustment

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msstring: What year and make car are you working on? Have you adjusted the rod on the master cylinder? Is there wear on the clevis pin and connecting points in your brake pedal mechanism? If so, "play" accumulates" at each moving joint.
Did you read this thread?
https://www.fordbarn.com/forum/showthread.php?t=180579
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Old 10-18-2020, 09:51 AM   #7
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Default Re: Brake Adjustment

If you don't have "quality help" when bleeding your brakes, "Speed-Bleeders" are a great help. Used properly, it is easy to do it by yourself.
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Old 10-18-2020, 10:03 AM   #8
msstring
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Default Re: Brake Adjustment

Thanks for the feedback. Truck is a 50 F3 whithout booster.

I had bled the master cylinder before I started.

The first time I bled them I had a helper (unenthused wife LOL), she would push & release as I released and tightened the bleeder. Yesterday helper was not available. But I had read in the shop manual about putting a hose down into a bottle of break fluid. So I did that without a helper thinking any bubbles would come out and float to the top and any drawback would be brake fluid. Maybe that is not actually true though as that would have to force the bubbles down to the bottle.

I did read the post linked, I saw that right after I posted my question. I noticed there that you should not push the pedal all the way down. I didn't know that.

I'll check the push rod adjustment and try again with a helper and in the sequence noted after I get some more brake fluid.

I did see the link about the bleeders with the check valve I might look into that too.

Thanks again for the help. I'll report back with an update after my next attempt.

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Old 10-18-2020, 10:29 AM   #9
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Default Re: Brake Adjustment

Stay with it. You can do it. You will feel so good when you get it right..
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Old 10-18-2020, 12:05 PM   #10
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Default Re: Brake Adjustment

You are using the correct wheel sequence for brake bleeding, correct?

If you decide to use Speed Bleeders, be sure to get the longer ones to make bleeding easier.

Do a Fordbarn search on "Speed Bleeders" and read, read, read.
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Old 10-18-2020, 12:07 PM   #11
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Default Re: Brake Adjustment

It doesn't take much of an overlook to keep having issues, one bubble in the system is noticeable.
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Old 10-18-2020, 08:01 PM   #12
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Default Re: Brake Adjustment

This is what I do when bleeding brakes (with a helper)


Fill a bottle (plastic please) with small amount of fluid.



Connect hose to bleeder, submerge other end in bottle fluid.



Have helper pump brakes two or three time and hold to floor (or stopping point)


Open bleeder till air/fluid is expended



Close bleeder



Tell helper to let up on pedal


Repeat till no air bubbles are expended


As stated, start with cylinder furthest away from master cylinder.
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Old 10-19-2020, 05:19 AM   #13
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Default Re: Brake Adjustment

AND--Make sure your bleeder hose doesn't have any holes in it!! (don't ask how I know)
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Old 10-19-2020, 05:56 AM   #14
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Default Re: Brake Adjustment

I agree with Paul except pump a lot more than 2 or 3 times. The hole letting fluid in and bubbles out of the Master is very small.
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Old 10-19-2020, 08:58 AM   #15
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Default Re: Brake Adjustment

I used a vacuum pump to pull the fluid thru my new calipers when I replaced them on my truck, then bled them the rest of the way with a helper.
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