1999 Chevrolet Suburban Drum Brake

Tiny
HELLOHIWELCOME
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • 7.4L
  • V8
  • 4WD
  • AUTOMATIC
My right rear drum is stuck but my left rear drum slides off really easy. What can cause a drum to be stuck? Could it be the Wheel cylinder, slack adjuster, the springs (that hold the shoes and adjuster together). Does changing the hardware on the shoes make a difference and make it slide off the next time I check my brake shoes?
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Thursday, March 5th, 2015 AT 5:28 PM

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Tiny
CJ MEDEVAC
  • EXPERT
JUST TO THROW OUT A DUMB EXAMPLE

YOUR DRUM MIGHT BE 2-1/4 INCHES WIDE

YOUR SHOES MAY BE 2 INCHES WIDE

OVER TIME AND BRAKING, THE 2 INCH SHOES WEAR A 2 INCH GULLY INTO THE DRUM

AS THE SHOES WEAR, THEY ADJUST OUTWARD

NOW THAT IT'S TIME TO REMOVE THE DRUM, THERE IS NOW A "CURB" (PER SAY) ON THE DRUM, THAT IS THE 1/4 INCH OF DRUM THAT THE SHOE NEVER CONTACTED

IN OTHER WORDS, THERE IS NOW A 1/4 INCH LIP, THAT DID DOT WEAR DOWN LIKE THE OTHER 2 INCHES. THE DRUM DOES NOT WANNA PULL OFF 'CAUSE THE BRAKE LINING IS HANGING ON THAT LIP

FIX?

ON THE BACKSIDE OF THE BRAKE BACKING, REMOVE THE DUST PLUG

HERE'S THE "HARDER PART"

YOU ARE GONNA HAVE TO INSERT A NAIL/ SCREWDRIVER/ ETC IN THE SLOT AND PUSH THE SELF ADJUSTER TAB OFF OF THE ADJUSTER WHEEL (THE TAB, PREVENTS THE WHEEL FROM BACKING OFF, ALSO PUSHES THE WHEEL IN THE ONE DIRECTION TO "SELF ADJUST")

WHILE HOLDING IT OFF THE WHEEL (WHICH IS NOW FREE) USE YOUR BRAKE SPOON IN THE REMAINING OPEN AREA TO "REVERSE" OR ROTATE THE ADJUSTER WHEEL "BACKWARDS" (PER SAY) TO "UN-ADJUST" THE SHOES' TENSION, BASICALLY REVERSE THE SELF ADJUSTING PROCESS!

ONCE THE SHOES BACK AWAY FROM THE DRUM, YOU OUGHTTA BE ABLE TO PULL THE DRUM OFF

KEEP US POSTED ON PROGRESS

THE MEDIC
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Thursday, March 5th, 2015 AT 7:04 PM
Tiny
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As I tried to pull the drum off, I see no lip. And my drum is my 3 1/2 wide and so are my shoes. The reason there's no lip because the drum slide off about 1/4 the way of the brake shoe and stopped there. I just had to keep rocking it hard to do that. Then it was hard to pull out. I just want know why does it get stuck like that. Is because a wheel cylinder, the springs, or is the slack adjuster. What needs to be replaced to prevent this drum to be stuck again. Because the other side slides off very easy. I'll try that brake spoon idea you suggested thanks.
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+1
Friday, March 6th, 2015 AT 5:30 PM
Tiny
CJ MEDEVAC
  • EXPERT
ANOTHER POSSIBILITY IS THE SHOES MAY HAVE BEEN CHANGED (MAYBE MORE THAN ONCE) AND THE DRUMS WERE NOT TURNED

THIS "COULDA" RESULTED IN THE CENTER OF THE DRUM'S SHOE SURFACE SORTA BEING WORN MORE IN THE MIDDLE

WHEN THE NEW SHOES "MIGHTA" BEEN INSTALLED, THEY REALLY ONLY GRABBED ON EITHER SIDE OF THE MIDDLE, UNTIL THEY WORE IN (RATHER FORMED THE SAME SHAPE AS THE DRUM SURFACE)

THE SHOES WOULD THEN (FINALLY) HAVE FULL CONTACT WITH THE DRUM SURFACE, IT WOULD CONTINUE TO SELF ADJUST AS NORMAL

THE KICKER MIGHT BE THERE'S A "HUMP" IN THE SHOE LININGS, THAT WON'T SLIDE OUTTA THE VALLEY IN THE DRUM SURFACE

BACKING OFF OF THE ADJUSTER (ENOUGH) SHOULD GET IT TO SLIDE BY WHATEVER HAS GOT THE SHOES HUNG ON

ONCE YOU GET 'EM APART, A STRAIGHT EDGE MIGHT VERIFY THE HUMP THEORY ON THE LININGS OR IN THE DRUM

KEEP US POSTED

THE MEDIC
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Friday, March 6th, 2015 AT 8:09 PM
Tiny
CJ MEDEVAC
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ONE MORE IDEA!

IF THESE ARE GLUED ON LININGS

MAYBE ONE OF THE LININGS COME UNGLUED

NOW IT'S WEDGED IN THE ASSEMBLY SOMEHOW

SEE THE PICS OF OUR SPARE CAR (DODGE NEON)

I JUMPED IN TO GO, AND IT WAS DRAGGING A TIRE

SEE MY LINING

THE MEDIC
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Friday, March 6th, 2015 AT 8:22 PM
Tiny
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Only changed the shoes once since I bought in 1999 (new) in 2009. Thanks for the advice.
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Saturday, March 7th, 2015 AT 4:29 PM
Tiny
CJ MEDEVAC
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I'M STICKING WITH THE "UN-WORN LIP THEORY" ON THE INBOARD PORTION OF THE DRUM!

ANY NEWS?

THE MEDIC
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Sunday, March 8th, 2015 AT 6:23 PM

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