11 inch drum questions

11 inch drum questions

Postby markmitch [OP] » August 16th 2015, 9:30pm

I have a lot of time to do whatever being medically retired so if anyone knows exactly what vehicles the 11 drum swap comes from years and make and models: I can do a bunch of pick n pull and other salvage yard searches and pass it on to the members. I would also need to know what parts are not available through the new parts systems.
Thanks Mark
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Re: 11 inch drum questions

Postby AstroWill » August 17th 2015, 12:08am

Sounds like you have plenty of time to figure it out. Let us know.

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Re: 11 inch drum questions

Postby 97cargocrawler » August 17th 2015, 12:34am

I did that swap a few years back and Im fairly certain I posted about it someplace...but I forgot. I also forgot all the part numbers and specs. I even looked in old emails for order confirmations since I bought all that online and didnt come up with much. I know you need the backing plate number and that I got from gm vintage parts and there is no part number listed in my order. Im fairly certain I bought the last new ones on the planet along with the obsolete parking brake levers.

If you have nothing but time wait a few years and mine may just be up for sale. Once I have new stuff I wont be saving those anymore. I have discs now but have been saving the drums because they were amazing. But soon I might not need any of it..including the axle.

The part numbers are out there.
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Re: 11 inch drum questions

Postby jrsride2002 » August 17th 2015, 12:54am

97cargocrawler wrote:Im fairly certain I bought the last new ones on the planet along with the obsolete parking brake levers.

Unfortunately true... Your 11" drums were based off the old caprice. I looked long and hard for those backing plates and everything. NADA

HOWEVER, I did find a fair amount of 11" drum stuff for the early to mid 90's pickups. I was going to go that route, until I was nudged into doing a full rear axle swap. I would find more gain for going that route, for my build.
I do NOT have any part numbers, but when I looked into those, I found there were plenty of retailers available with those parts.

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Re: 11 inch drum questions

Postby markmitch [OP] » August 17th 2015, 1:30am

well when its 100* + outside then that would mean 110*+ in my garage and add that to my headaches so I am in the house with the central air on=plenty of time But I tried to do an interchange search online and got no where. My rear brakes are stock and new so no rush but since I do wish to tow a camper next year with my astro the 11 inch drums would be a nice add on.
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Re: 11 inch drum questions

Postby markmitch [OP] » August 17th 2015, 2:28am

The drums fit many vehicles (GM) over the years but the backing plates I am not sure about yet.
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Re: 11 inch drum questions

Postby jrsride2002 » August 17th 2015, 3:18am

GM has been using that 10 bolt axle for decades, and on many platforms. They didn't change the, "foundation" for the brakes to be applied to. The 10 bolt was used on 1/4 ton trucks, and a few 1/2 ton trucks. I might suggest, doing your searched based on that... But thats just a personal opinion.

When I did my search, I based it on just 1/4 trucks. THEN searched if the backing plates would/would not work. But again, I would search based on the axle.

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Re: 11 inch drum questions

Postby 97cargocrawler » August 17th 2015, 8:11am

No. Look at large sedans. Cop cars, taxis, limos....

I saw nothing for trucks that matched the bolt pattern. But that is easily changed if your inclined to do so.
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Re: 11 inch drum questions

Postby Lumpy » August 17th 2015, 8:57am

97cargocrawler wrote:No. Look at large sedans. Cop cars, taxis, limos....



Mid 90s Chev Caprice cop cars. Ugliest inverted bathtub in the universe. Embarassing to drive around for cops. But they could slow from 110 to zero right NOW without losing control. GM police pkg stuff kicked the Furd police pkg stuff's ***. Fords would smoke after a pursuit. Chev's just got warm.


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Re: 11 inch drum questions

Postby chevymaher » August 17th 2015, 1:38pm

I am going to do brakes in the foreseen future. Whenever these need it in a year or so judging by wear I got. I may do the 11 inch rear thing.
Axles, backing plates, the whole nine yards. It is time they need a freshening up. Fronts just some slotted rotors and go with what is there. Replace the caliper slider parts.

My backing plates are visibly worn where the pads ride. And someone set it on the ground with the tires and drums off it looks like. Damn Firestone. Only ones who ever touched them before i got it. They all bent up.
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Re: 11 inch drum questions

Postby Astrofarian » August 17th 2015, 3:56pm

Lumpy wrote:
97cargocrawler wrote:No. Look at large sedans. Cop cars, taxis, limos....



Mid 90s Chev Caprice cop cars. Ugliest inverted bathtub in the universe.


Sgt Lump


Roger that....looked like a turtle on a skateboard, LoL.

So, is the Astro master cylinder up to the task here; are the wheel cylinders any larger, and if so, is more pressure/volume required to maintain proper front/rear brake bias?
Any thoughts/ experiences to share with us, Jack?
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Re: 11 inch drum questions

Postby jrsride2002 » August 18th 2015, 1:54am

97cargocrawler wrote:I saw nothing for trucks that matched the bolt pattern. But that is easily changed if your inclined to do so.

Thats right! :doh:
They have that trapezoid pattern. I remember, I was going to try and make it work. Until I decided to swap the axle entirely....

Sorry dude, not trying to mislead or pass on bad info. Not my intention to step on toes,
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Re: 11 inch drum questions

Postby 97cargocrawler » August 18th 2015, 3:20am

Astrofarian wrote:
Lumpy wrote:
97cargocrawler wrote:No. Look at large sedans. Cop cars, taxis, limos....



Mid 90s Chev Caprice cop cars. Ugliest inverted bathtub in the universe.


Sgt Lump


Roger that....looked like a turtle on a skateboard, LoL.

So, is the Astro master cylinder up to the task here; are the wheel cylinders any larger, and if so, is more pressure/volume required to maintain proper front/rear brake bias?
Any thoughts/ experiences to share with us, Jack?
-Mike-


The stock MC will work just fine. They do have WC's with slightly larger bore for those brakes. I had those plus 1-ton calipers up front and there were no volume issues. I really loved those brakes. The only weak part was the pin that secures the springs on the backing plate.
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Re: 11 inch drum questions

Postby markmitch [OP] » August 18th 2015, 4:06am

I have a friend back in New Hampshire that owns a auto salvage yard and I will call him and see if he can do a interchange search for me and if he can I will post his findings. Mark
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Re: 11 inch drum questions

Postby markmitch [OP] » December 7th 2015, 6:50pm

I found three Buick roadmasters in a local pick n pull I am going to check it out Wednesday, I will post my findings.
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Re: 11 inch drum questions

Postby markmitch [OP] » December 10th 2015, 6:26am

OK here some pictures I got from the pick n pull. There are 3 of these Buick roadmasters all have complete 11 inch drum brakes except the drums are gone But Rock auto sells the new drums. I have a few pictures to. These cars all came with posi, front and rear sway bars and LT1 V8's I was like WOW when I seen this. I am going back Saturday (weather permitting) to get the backing plates I already got the bracketry cost for the bracketry $3.80 I read as much as I could find on here about this swap and I will buy the wheel cylinders, brake pads, drums and springs new. All this will go on another newer Astro rear axle. ANyone know if the posi would still be useable? is it rebuildable? According to the internet these cars came with a 2:93 posi rear axle I may be interested in using the posi and gears if its worth the hassle. Anyone know much about the LT1 350? If I wanted to use these heads what would I have to change? just curious. Thanks Mark

PS I will let you all know how much the backing plates will be if anyone wants me to grab a set for them -price I pay plus shipping
I can possibly get my set and one other set to ship . Mark
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Re: 11 inch drum questions

Postby 97cargocrawler » December 10th 2015, 10:17am

Be sure to grab those two plunger pins out of the wheel cylinders too. The new cylinders will not come with those pins. You should have two per side (4).
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Re: 11 inch drum questions

Postby WoodButcher » December 10th 2015, 1:51pm

Count me in Mark! this is something I've wanted to do for a long time.
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Re: 11 inch drum questions

Postby AstroWill » December 10th 2015, 3:20pm

What years are they from?

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Re: 11 inch drum questions

Postby markmitch [OP] » December 10th 2015, 4:21pm

1 is a 93 1 is a 94 and then the last is a 96 I will have to put this stuff on my credit card so when I get the cash back it will go back to the credit card company. I will look at the other pick n pulls too if anyone else is looking for this stuff. Thanks CC for telling me about those pins I did not know that one. which bracket is hard to get?
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in Brakes
Views: 3515
Comments: 37
Date: Sep 03 '20
Time: 9:36pm
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