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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


drum brake backing plates 11" and column stick shift

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Joe73
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drum brake backing plates 11" and column stick shift Empty drum brake backing plates 11" and column stick shift

Post by 76Chevelle2Tone Sun Oct 22, 2023 10:42 am

Looking for those pesky 11" backing plates for the rear drum brakes. There are 9 1/2 " everywhere but no 11" I guess because the previous generation didn't use them. The few used ones I've seen were in lousy condition.

Also a non-corroded column stick shift lever. This is for a Non tilt column. Thanks
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drum brake backing plates 11" and column stick shift Empty Re: drum brake backing plates 11" and column stick shift

Post by Joe73 Sun Oct 22, 2023 4:45 pm

Most monte carlos have 11" rear brakes. If you column lever isnt too bad, Id soak it in white vinegar for a day or two then rinse it off. It will remove the rust. Not perfect but should be an improvement.
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drum brake backing plates 11" and column stick shift Empty Re: drum brake backing plates 11" and column stick shift

Post by zucchi Mon Oct 23, 2023 8:21 am

Joe73 wrote:If you column lever isnt too bad, Id soak it in white vinegar for a day or two then rinse it off.  It will remove the rust.  Not perfect but should be an improvement.
Oxalic acid is better. Should be able to order it online or through any compounding pharmacy. Both this and vinegar (acetic acid) are organic acids and work on rust without eating away at steel like muriatic acid (hydrochloric acid) would. An old reliable is naval jelly which uses phosphoric acid as its active ingredient. It works well and is quicker than any organic acid but leaves a black phosphate coating which some opining is unappealing.
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Post by 76Chevelle2Tone Mon Oct 23, 2023 11:33 am

Zucchi
Is oxalic acid used in the same way as the vinegar? If not what is the application process? Are there any hazards to its use? Thanks
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Post by zucchi Mon Oct 23, 2023 11:56 am

76Chevelle2Tone wrote:Zucchi
Is oxalic acid used in the same way as the vinegar? If not what is the application process? Are there any hazards to its use? Thanks
Pure oxalic acid is a powder and to use it, you must dissolve it in water.

A good detailed article can be found at https://azrust.com/oxalic-acid-for-rust-removal/.

I personally prefer to rinse a treated part with a mild sodium bicarbonate (baking soda) solution to neutralize any residual acid before I do a final rinse with very hot clean water. I say hot because that will heat the metal and allow it to try more quickly so as to prevent rust formation on your freshly de-rusted metal.
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drum brake backing plates 11" and column stick shift Empty Re: drum brake backing plates 11" and column stick shift

Post by 1973 454 MONTE Tue Oct 24, 2023 12:12 pm

Joe73 wrote:Most monte carlos have 11" rear brakes.  If you column lever isnt too bad, Id soak it in white vinegar for a day or two then rinse it off.  It will remove the rust.  Not perfect but should be an improvement.

only 76/77 had 11" brakes
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drum brake backing plates 11" and column stick shift Empty Re: drum brake backing plates 11" and column stick shift

Post by zucchi Tue Oct 24, 2023 12:52 pm

1973 454 MONTE wrote:only 76/77 had 11" brakes

These were for 3-3/4" and 4" wide drums.

Furthermore, according to RockAuto:

CHEVROLET CHEVELLE — 1973
CHEVROLET EL CAMINO — 1973-1977
CHEVROLET LAGUNA — 1973-1976
CHEVROLET MALIBU — 1973-1977

But these were only for 3-3/4" wide drums.
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Post by zucchi Tue Oct 24, 2023 2:39 pm

By the way, looks like 1976 had unique rear baking plates:

18001257 - LH
18001258 - RH

For 1977 on, they were:

18002392
18002393

Check out the parts catalog: http://www.gmpartswiki.com/getpage?pageid=97445
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Post by 76Chevelle2Tone Tue Oct 24, 2023 4:50 pm

zucchi wrote:By the way, looks like 1976 had unique rear baking plates:

18001257 - LH
18001258 - RH

For 1977 on, they were:

18002392
18002393

Check out the parts catalog: http://www.gmpartswiki.com/getpage?pageid=97445

I looked in my parts manual and you are right. I give up. GM has defeated me again with nonsensical changes.
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Post by 76Chevelle2Tone Wed Oct 25, 2023 12:00 pm

zucchi wrote:
1973 454 MONTE wrote:only 76/77 had 11" brakes

These were for 3-3/4" and 4" wide drums.

Furthermore, according to RockAuto:

CHEVROLET CHEVELLE — 1973
CHEVROLET EL CAMINO — 1973-1977
CHEVROLET LAGUNA — 1973-1976
CHEVROLET MALIBU — 1973-1977

But these were only for 3-3/4" wide drums.

Not sure I understand why Montes have 3 3/4 and 4 inch wide drums. Also the repro 11 76-77 drums I've seen seem to be either 3 1/4 or 4 inch. Is the difference between 3 3/4 and 4 inch meaningful? In other words for the 76-77 Malibu do 4 inch wide drums fit?
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drum brake backing plates 11" and column stick shift Empty Re: drum brake backing plates 11" and column stick shift

Post by 1973 454 MONTE Thu Oct 26, 2023 11:24 am

zucchi wrote:
1973 454 MONTE wrote:only 76/77 had 11" brakes

These were for 3-3/4" and 4" wide drums.

Furthermore, according to RockAuto:

CHEVROLET CHEVELLE — 1973
CHEVROLET EL CAMINO — 1973-1977
CHEVROLET LAGUNA — 1973-1976
CHEVROLET MALIBU — 1973-1977

But these were only for 3-3/4" wide drums.

i was talking about MONTE CARLO having 9.5 brakes 73-75 and 76/77 having 11"
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drum brake backing plates 11" and column stick shift Empty Re: drum brake backing plates 11" and column stick shift

Post by impalamonte Fri Oct 27, 2023 9:29 pm

I fished these out of my box-o-parts.

From my 73 Monte.

Am I measuring these correctly?

drum brake backing plates 11" and column stick shift 20231012
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Post by 76Chevelle2Tone Fri Oct 27, 2023 11:27 pm

I can't see the picture very clearly but generally the backing plates are an inch or so wider than the drums. As best as I can tell those backing plates look sized for 9.5" brake drums
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Post by Limey SE Sun Oct 29, 2023 7:21 pm

impalamonte wrote:I fished these out of my box-o-parts.

From my 73 Monte.

Am I measuring these correctly?

drum brake backing plates 11" and column stick shift 20231012

Do you have the bolts for them to axle or know what they are I need them for new axle build

___________________________________________
1977 Chevelle SE x2
One Mild original
one Wild NON original
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Post by impalamonte Tue Oct 31, 2023 3:26 pm

I have had these off the car for maybe 5+ years.

I have a "bolts" bin......I am sure they are muddled in there with the other 200 automotive bolts accumulated over the years.
I would not know where to start.

Mark
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