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#1 |
Registered User
Join Date: Jul 2012
Location: Space Coast, Florida
Posts: 403
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No adjusting slot on drum backing plate
My rear drum brake backing plates don't have a slot in them for adjusting the brakes. Is this the norm for our trucks? I have had other vehicles that I had to back off the brakes through the slot to get the drum off. Hate to have a drum stuck and have no slot.
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1968 SWB Step Side, Big Block, 4L80E , Running! |
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#2 | |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,373
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Re: No adjusting slot on drum backing plate
Quote:
LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#3 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,234
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Re: No adjusting slot on drum backing plate
Yup.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#4 |
Registered User
Join Date: Jul 2012
Location: Space Coast, Florida
Posts: 403
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Re: No adjusting slot on drum backing plate
Will check that out, Thanks LockDoc
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1968 SWB Step Side, Big Block, 4L80E , Running! |
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#5 |
Registered User
Join Date: Jul 2012
Location: Space Coast, Florida
Posts: 403
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Re: No adjusting slot on drum backing plate
Just looked at the drums ( which I had off ), and there is not even a hint of a punch out. These are likely replacement drums. I was thinking of putting a hole in the backing plate that would fit one of those rubber plugs they sell.
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1968 SWB Step Side, Big Block, 4L80E , Running! |
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#6 | |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,373
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Re: No adjusting slot on drum backing plate
Quote:
I have never tried it but it should work. Let us know if you run into any problems with that. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#7 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,234
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Re: No adjusting slot on drum backing plate
Weird. I've punched literally hundreds of those knockouts out of drums and backing plates (trucks and cars). I guess the new stuff from Chinee isn't provided with that feature?
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#8 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,557
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Re: No adjusting slot on drum backing plate
My K20 still has original drums, also with no hint of a knockout. Finally drilled holes in the backing plates and put in rubber plugs a number of years ago. Works great!
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#9 |
Registered User
![]() Join Date: Feb 2012
Location: Vinton, Va.
Posts: 473
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Re: No adjusting slot on drum backing plate
Stocker says his original drums has no slots, so there's more to the story than cheap and/or replacement drums. So my first ? Would be to stocker- how do u confirm your drums are original ? Stamped part # maybe. Facts first
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"You are not forgotten" USMC 75-79 (Aviation Ordnance Tech- F-4 Phantom) 1959 H-D Panhead. Owned since 1978. Currently with son in Lawton, OK. 1968 Chevy Custom SWB pick up. Fleetside. Lowered 4/6. Totally refurbished. 1966 Pontiac GTO. 4 speed. Saved original 389. Now has slightly built 455 engine. 355 rear gears. Very fun to drive ! |
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#10 |
Registered User
Join Date: Jul 2012
Location: Space Coast, Florida
Posts: 403
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Re: No adjusting slot on drum backing plate
Think I would drill two or three holes, and then dremel them out.
__________________
1968 SWB Step Side, Big Block, 4L80E , Running! |
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#11 | |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,557
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Re: No adjusting slot on drum backing plate
Quote:
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#12 |
Registered User
![]() Join Date: Mar 2017
Location: Port Murray, NJ
Posts: 147
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Re: No adjusting slot on drum backing plate
I have a low mile 68 that has the knockouts outlined on drums. With under 40k , I am confident they are originals. Maybe later ones don’t have the markings for knockout.
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#13 |
Registered User
Join Date: Apr 2014
Location: Southern Iowa
Posts: 306
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Re: No adjusting slot on drum backing plate
Don't blast me for mentioning this, but don't our trucks have a self-adjusting rear drum brake set-up. A few 10 mph reverse blasts, then lock up the brakes is supposed to adjust the rears drums. Might be why we see so many back plates with no holes?
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1972 C30 Grain Hauler, 350/400 1967 1500 GMC Stepside SWB, In Transformation Process 1967 RS/SS Camaro 350/TKO600 |
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#14 |
Registered User
Join Date: Jun 2010
Location: Orlando, Florida
Posts: 2,508
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Re: No adjusting slot on drum backing plate
The problem is when you want to take the drums off, it is nice to be able to back off a little bit on the adjuster to free up the drum.
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71 Chevy C10 Shortbed Stepside. LT1 with 4l60E. Just got back from painter, in assembly now. |
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#15 | |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,557
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Re: No adjusting slot on drum backing plate
Quote:
Also, those adjusters operate in a nasty environment and may not work anymore. With luck, they can be cleaned & lubed and continue doing their job.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#16 |
Registered User
Join Date: Jan 2011
Location: Delaware and Long Island, New York
Posts: 3,455
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Re: No adjusting slot on drum backing plate
No blasting here, you are 100% correct.
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#17 |
Registered User
Join Date: Jul 2012
Location: Space Coast, Florida
Posts: 403
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Re: No adjusting slot on drum backing plate
Cut in brake adjusting slots in my rear drum backing plates to fit the rubber plugs I bought. This is so I can adjust the brakes initially, or back them off if I need to take the drum off, and it won't come off.
__________________
1968 SWB Step Side, Big Block, 4L80E , Running! |
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#18 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,234
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Re: No adjusting slot on drum backing plate
![]() And you only have to do it once. It's worth all the sweat.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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