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#2402069 - 11/11/17 04:32 PM Re: Why do my brakes keep un-adjusting? [Re: mickm]
John_Kunkel Offline
I Live Here

Registered: 01/20/03
Posts: 19139
Loc: Rio Linda, CA
Originally Posted By mickm
Originally Posted By John_Kunkel
You are aware that the self-adjusters only work when the brakes are firmly applied when backing up?

Lots of folks shift to Drive after backing up and seldom/never use the brakes.


Yes, that's why I pried the rear shoe away from the top mount. And as mentioned, it worked as expected.


Yeah, but is the driver actually using the brakes to stop when backing up?
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#2402073 - 11/11/17 04:39 PM Re: Why do my brakes keep un-adjusting? [Re: mickm]
Mattax Offline
super stock

Registered: 02/28/10
Posts: 1049
Loc: Phila. Pa.
Might be hunting up the wrong tree.
If the right brake seems to grab hard, then maybe the left brake isn't grabbing at all. Why? Initial adjustment plays a role, but not to extent described.

20-30 miles is not normally far enough to have made a difference in the shoe lining thickness. Normally - if you're coming down Mt Washington at a clip, wear will be higher. :lol:

If the shoes aren't grabbing, then the self-adjusters won't move.
On the '69 up adjusters, adjusters are actuated in reverse as the secondary shoes grab .

Based on what's posted so far, I'd see if the left wheel cylinder can be bled and if the wheel cyl pistons both move free.

Also, review Chrysler's drum brake advice to techs
http://www.imperialclub.org/Repair/Lit/Master/204/Page01.htm

and '69
http://www.imperialclub.org/Repair/Lit/Master/260/Cover.htm

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#2402159 - 11/11/17 06:40 PM Re: Why do my brakes keep un-adjusting? [Re: mickm]
mopars4ever Offline
I Live Here

Registered: 01/20/03
Posts: 10642
Loc: md
Are the primary and secondary shoes in the correct positions? Not sure if it would cause the issue but I thought I would ask.

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#2412931 - 12/03/17 11:44 PM Re: Why do my brakes keep un-adjusting? [Re: minivan]
mickm Offline
master

Registered: 07/26/06
Posts: 4065
Loc: California
So if anyone has noticed, I kind of got sidetracked from the brake issue because I broke the perch that the motor mount sits on clean off of the k frame.

So as I'm taking the whole front end apart to drop the k frame, I did get a chance to take a picture of the brakes. All look good to me, but the first picture is the drivers side, the one that keeps un adjusting.


Attachments
IMG_4869.jpg

IMG_4871.jpg

Description: The passenger side, the one that keeps in adjustment.


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"the orange fun car" 540 Hemi 4 spd 3:54 dana
1 of 1 - only FK5 70 Road Runner that used to be a 383 auto now a 540 Hemi Six-Pak 4 spd in existence

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#2412934 - 12/03/17 11:58 PM Re: Why do my brakes keep un-adjusting? [Re: mickm]
rhad Offline
mopar

Registered: 08/19/03
Posts: 646
Loc: garnett kansas
is the drivers side adjuster left hand thread?,if not thats your problem
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#2412959 - 12/04/17 03:05 AM Re: Why do my brakes keep un-adjusting? [Re: rhad]
amxautox Offline
Still Retired. Still Posting on Moparts. A Lot.

Registered: 05/13/03
Posts: 96502
Loc: On The Boat, On The Lake, Wa. ...
Yes it's left hand thread, you can see that in the picture. And yes I checked when I saw the picture.
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"Everyone should believe in something; I believe I'll go fishing."

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#2412961 - 12/04/17 03:48 AM Re: Why do my brakes keep un-adjusting? [Re: mickm]
Transman Offline
mopar

Registered: 03/27/11
Posts: 690
Loc: Michigan
Why are the backing plate bolts loose in your first picture?

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#2412962 - 12/04/17 03:49 AM Re: Why do my brakes keep un-adjusting? [Re: Transman]
amxautox Offline
Still Retired. Still Posting on Moparts. A Lot.

Registered: 05/13/03
Posts: 96502
Loc: On The Boat, On The Lake, Wa. ...
because he just said in reply number #2412931 at 8:44pm;

Quote:
So as I'm taking the whole front end apart to drop the k frame,
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Tom

"Everyone should believe in something; I believe I'll go fishing."

-Henry David Thoreau

Men and fish are alike. They both get into trouble when they open their mouths

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#2412986 - 12/04/17 08:01 AM Re: Why do my brakes keep un-adjusting? [Re: amxautox]
Supercuda Offline
I Live Here

Registered: 09/04/07
Posts: 12929
Originally Posted By amxautox
because he just said in reply number #2412931 at 8:44pm;

Quote:
So as I'm taking the whole front end apart to drop the k frame,


No need to remove those bolts though

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#2413022 - 12/04/17 09:52 AM Re: Why do my brakes keep un-adjusting? [Re: mickm]
Transman Offline
mopar

Registered: 03/27/11
Posts: 690
Loc: Michigan
Yep- that threw me - I read his post but no reason to take the backing plates loose -

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#2413032 - 12/04/17 10:07 AM Re: Why do my brakes keep un-adjusting? [Re: Transman]
gtx6970 Online   content
I Live Here

Registered: 06/28/03
Posts: 16937
Loc: Land of Booze and Horses
Originally Posted By Transman
Yep- that threw me - I read his post but no reason to take the backing plates loose -


Ive done it that way several times over the years.
Much easier to do it this way than break the ball joint loose. ( aka no pitchfork tool or BFH required to break the ball joint loose. )

This way the lower ball joint and associated suspension components come out the with the K frame / lower control arms / tie rod ends intact.

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#2413083 - 12/04/17 12:00 PM Re: Why do my brakes keep un-adjusting? [Re: gtx6970]
amxautox Offline
Still Retired. Still Posting on Moparts. A Lot.

Registered: 05/13/03
Posts: 96502
Loc: On The Boat, On The Lake, Wa. ...
And he doesn't have to break lose the brake lines and have to bleed the brakes. Different ways to get the job done.
_________________________
Tom

"Everyone should believe in something; I believe I'll go fishing."

-Henry David Thoreau

Men and fish are alike. They both get into trouble when they open their mouths

author unknown


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#2413092 - 12/04/17 12:27 PM Re: Why do my brakes keep un-adjusting? [Re: mickm]
floridian Offline
pro stock

Registered: 08/10/12
Posts: 1574
Loc: Lakeland FL
First pic looks like you have the shoes mixed up.. Isnt the longer shoe supposed to go on the back??

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#2413130 - 12/04/17 01:25 PM Re: Why do my brakes keep un-adjusting? [Re: floridian]
mickm Offline
master

Registered: 07/26/06
Posts: 4065
Loc: California
Originally Posted By floridian
First pic looks like you have the shoes mixed up.. Isnt the longer shoe supposed to go on the back??


I'll double check, but I think the shoes are on correctly.
_________________________


"the orange fun car" 540 Hemi 4 spd 3:54 dana
1 of 1 - only FK5 70 Road Runner that used to be a 383 auto now a 540 Hemi Six-Pak 4 spd in existence

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#2413131 - 12/04/17 01:25 PM Re: Why do my brakes keep un-adjusting? [Re: gtx6970]
mickm Offline
master

Registered: 07/26/06
Posts: 4065
Loc: California
Originally Posted By gtx6970
Originally Posted By Transman
Yep- that threw me - I read his post but no reason to take the backing plates loose -


Ive done it that way several times over the years.
Much easier to do it this way than break the ball joint loose. ( aka no pitchfork tool or BFH required to break the ball joint loose. )

This way the lower ball joint and associated suspension components come out the with the K frame / lower control arms / tie rod ends intact.


Yes, that was the plan...
_________________________


"the orange fun car" 540 Hemi 4 spd 3:54 dana
1 of 1 - only FK5 70 Road Runner that used to be a 383 auto now a 540 Hemi Six-Pak 4 spd in existence

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#2413136 - 12/04/17 01:32 PM Re: Why do my brakes keep un-adjusting? [Re: amxautox]
Supercuda Offline
I Live Here

Registered: 09/04/07
Posts: 12929
Originally Posted By amxautox
And he doesn't have to break lose the brake lines and have to bleed the brakes. Different ways to get the job done.


Is there enough slack in the brake hose to slide the drum backing plate off the spindle?

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#2413141 - 12/04/17 01:39 PM Re: Why do my brakes keep un-adjusting? [Re: Supercuda]
amxautox Offline
Still Retired. Still Posting on Moparts. A Lot.

Registered: 05/13/03
Posts: 96502
Loc: On The Boat, On The Lake, Wa. ...
Originally Posted By Supercuda
Originally Posted By amxautox
And he doesn't have to break lose the brake lines and have to bleed the brakes. Different ways to get the job done.


Is there enough slack in the brake hose to slide the drum backing plate off the spindle?

Might be. If he lifts the arms and spindle up all the way, then it's very possible.
_________________________
Tom

"Everyone should believe in something; I believe I'll go fishing."

-Henry David Thoreau

Men and fish are alike. They both get into trouble when they open their mouths

author unknown


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#2413168 - 12/04/17 02:57 PM Re: Why do my brakes keep un-adjusting? [Re: mickm]
NANKET Offline
master

Registered: 12/13/03
Posts: 3901
Loc: northwest USA
Leave the upper control arm, spindle, and backing plate in the car, no need to remove it.

Take the k frame with lower control arms, lower ball joints and all the steering linkage with it, great plan.

You don't need to bleed brakes, align the front end, bust ball joints and rip the boots.

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#2414059 - 12/06/17 01:29 AM Re: Why do my brakes keep un-adjusting? [Re: NANKET]
mickm Offline
master

Registered: 07/26/06
Posts: 4065
Loc: California
So this thread seems to have gone a little off track with the k frame removal. what about the brakes? anyone see anything in the pictures, or have any other ideas?
_________________________


"the orange fun car" 540 Hemi 4 spd 3:54 dana
1 of 1 - only FK5 70 Road Runner that used to be a 383 auto now a 540 Hemi Six-Pak 4 spd in existence

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#2414271 - 12/06/17 01:41 PM Re: Why do my brakes keep un-adjusting? [Re: mickm]
67SATisfaction Offline
master

Registered: 01/21/03
Posts: 6894
Loc: Albany, NY
Yes, back the brake problem...

Originally Posted By mickm
when I hit the brakes it pulls sharply to the right. Adjust it out and everything is ok.

What could be causing this?


It is super frustrating for such a simple set up to go wrong, isn't it? You are sure the driver's shoes aren't wearing down prematurely, right? Does the car pull left when shoes are adjusted manually?

Otherwise the car pulling to the side when the shoes wear down for lack of adjustment, could be hydraulic pressure isn't split equally... but you'd have pulling to the left after adjustment..

.. so, OK my gut agrees the problem is in the adjuster system.

(to explain - I had a persistent "unequal braking" problem at my rear brakes a few years ago - the adjuster setup looked dead perfect, so I kept thinking it was hydraulic pressure sending unequal brake force to the rears. End of story was I found a very small discrepancy in the actuator arm's position that didn't let it engage the star wheel properly - it was the cable's eye loop at the TOP of the brake drum resulted in a shorter cable length. Problem solved).

Going back to something very basic: I'd remove the rear brake drums which are working FINE (are they wearing equally?) and compare the fronts to the rears.... compare orientation of brake shoes, star wheel, cables, springs, everything.. my gut tells me something very minor isn't right and you have to find it by careful observation of something that DOES WORK right..

Do you have any Mopar buddies with '70 B-body? My '67 and '65 are just a bit different than yours.

Cheers,
- Art


Edited by 67SATisfaction (12/06/17 01:42 PM)
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1967 Satellite convert 383/4bbl, auto, pegleg 3.23
1975 Maserati Bora, 4.9L DOHC hemi V8, 5-spd ZF
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