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77 B-200 brake problems #2650912
05/01/19 02:31 PM
05/01/19 02:31 PM
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bboogieart Offline OP
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The entire system is 2 years old and works fine, with the exception of the pedal being pulled to the floor.
Over riding the spring. I have added a much heavier spring and it still does not retrieve the pedal
The brakes stop the van with relative ease.
I then have to reach down and pull the pedal back up.
Maybe the shoes are contaminated or the drums are rusty. (?)
Cold and rainy the next week so getting at it will be awhile.


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Re: 77 B-200 brake problems [Re: bboogieart] #2650920
05/01/19 02:48 PM
05/01/19 02:48 PM
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Grand Prairie,Texas
stumpy Offline
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That sounds more like a booster issue.

Re: 77 B-200 brake problems [Re: stumpy] #2650925
05/01/19 03:04 PM
05/01/19 03:04 PM
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bboogieart Offline OP
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Thanx. easy enough to check.
I'll unplug it and see if it works as it should.
The pedal will be hard but it should not pull the pedal down, right?

I stepped on the pedal with out the motor running and the pedal does not return.
Some one on another forum stated the linkage grommet might be bad.
Any idea how to get at that?
It's pretty tight under there.


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Re: 77 B-200 brake problems [Re: bboogieart] #2657094
05/20/19 12:37 AM
05/20/19 12:37 AM
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bboogieart Offline OP
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Wish the weather would comply.
I am still guessing the adjusters are making things tight ever time I hit the brakes, instead of just adjusting when backing up.


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Re: 77 B-200 brake problems [Re: bboogieart] #2657188
05/20/19 11:01 AM
05/20/19 11:01 AM
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Grand Prairie,Texas
stumpy Offline
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If that was the case then the brakes would lock up and the pedal would rise not drop.

Re: 77 B-200 brake problems [Re: stumpy] #2660645
05/30/19 03:20 PM
05/30/19 03:20 PM
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bboogieart Offline OP
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The brakes are applying.
They don't lock up, but they sure enough stop the van.
Not going fast enough for a lock-up.
I have to pull the pedal back up by hand.
I'm still not sure how the vacuum canister would apply brakes.
If the vacuum could be applying the brakes, they would pull down with out my input right?
The self adjusters are only supposed to activate when in reverse.
In the wrong side, would they not activate every time the brakes are applied?
The adjusters getting the shoes progressively tighter would pull the shoes away from the cylinder and cause the fluid to fill the void, pulling the pedal down. No? shruggy
1st step is remove the drums. This should give me some kind of clue.
I'll be looking at it again soon, as the weather is starting to comply.

Last edited by bboogieart; 05/30/19 03:34 PM. Reason: oops

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Re: 77 B-200 brake problems [Re: bboogieart] #2661219
06/01/19 01:18 PM
06/01/19 01:18 PM
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Bend,OR USA
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Cab_Burge Offline
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The brake cylinders can not hold the brake peal down due to pressure from the master cylinder pushing the brake cylinders out, correct work
The master cylinder or the booster is sticking in the depressed position scope
Let us know what you find up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 77 B-200 brake problems [Re: Cab_Burge] #2661666
06/02/19 10:09 PM
06/02/19 10:09 PM
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Freeport IL USA
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Some of the "B" vans had brackets that offset and even turned the master 90 degrees to the booster. All of those had some sort of a pivot assembly for the activation rod. Over time, I have seen those pivots gum up and restrict the free movement of the brake activation rod. Going down, you foot has enough power to overcome any resistance, but coming up the resistance can overcome the return spring. I have also seen where boosters were changed and the alignment between the master and the pedal bracket was off enough to cause a drag in the activation rod. You want ro be sure your problem isn't caused by either of these situations.

If the brake booster and its mounting are good, about the only thing that can pull a brake pedal down (or more accurately not allowing it to return to the top) is a faulty master cylinder.

The inside passages are partially plugged up and the fluid can not return to the reservoir. If you open the cap, is the fluid dark and dirty appearing? Flushing the master may work, but the odds are you need to replace the master cylinder. Gene

Re: 77 B-200 brake problems [Re: poorboy] #2661891
06/03/19 02:50 PM
06/03/19 02:50 PM
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Thanks for all the help guys. up
What gets me is the brakes actually apply themselves after the pedal gets about half way down.
I can envision the fluid being pulled out of the master cylinder and causing this action.
Guess I have not made that clear.
Also I guess I'm having a hard time seeing how the pivots could do this.
I will lubricate them just out of general principle.
The booster, all cylinders ,calipers, hardware and lines are only two years old.
I get that doesn't mean much today.
Looks like the rain will let up soon, so I will address this and get back with results.


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Re: 77 B-200 brake problems [Re: bboogieart] #2661952
06/03/19 07:04 PM
06/03/19 07:04 PM
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Posts: 2,363
Cotati, CA
Dave Hall Offline
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The master cyl. piston bore can get crud/surface rust and hold as well. Lubricate the god out of that area around where the plunger goes into the master and work the pedal. A lot of these old trucks leak in the windshield/cowl area.

Re: 77 B-200 brake problems [Re: Dave Hall] #2677379
07/14/19 06:26 PM
07/14/19 06:26 PM
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bboogieart Offline OP
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Finally got around to that van.
Sprayed the ba-Jeezuz out of every thing under the hood and dash & had to replace a front brake caliper so did both.
Bled it out and, Werking fer a livin'. All is well with the world.
Thanx for your patients and understanding.


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I have mechanical Aptitude.
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