BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Drum to Disc?

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Tomz9C1

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Posts : 1491
Join date : 2009-01-21
Age : 54
Location : Rumford, Maine

PostSubject: Drum to Disc?   Tue Jul 06, 2010 4:35 pm

So how big a deal is it to convert to Disc. I have a donor 9C1, so I guess all the parts should be there. If anyone has done this or has some insight, chim in.
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bammax

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Posts : 2301
Join date : 2009-02-22
Age : 36
Location : Mansfield, Ma

PostSubject: Re: Drum to Disc?   Tue Jul 06, 2010 4:38 pm

1st way is to just swap the rear-end and adjust the brake lines as needed. You'll also need to swap over the rear half of the e-brake cable.

2nd way to do it involves pulling the axles and bolting in the backing plates and then reinstalling the axles along with all the brake components.

Feel free to choose which ever one works best for your patience level.
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Tomz9C1

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Join date : 2009-01-21
Age : 54
Location : Rumford, Maine

PostSubject: Re: Drum to Disc?   Tue Jul 06, 2010 6:34 pm

I have to extract the axles to get the disc hardware off, DOH! Guess I'll figure it out.
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Waldo617

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Posts : 194
Join date : 2010-03-20
Age : 29
Location : Milton

PostSubject: disc brake conversion   Wed Jul 07, 2010 12:44 am

i was thinkin about doing the conversion also but i have the 11inch rear drums and my car stops on a dime. so i am gonna buy new drums and paint them body color!

when doing the conversion i would think that you would have to change the proportioning/combination valve....
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GasTT

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Join date : 2009-01-19
Age : 29
Location : Treasure Coast, FL

PostSubject: Re: Drum to Disc?   Wed Jul 07, 2010 12:49 am

Sorry to go off track a bit but in my opinion, drums painted any color other than black looks tacky. Unless they are aluminum and they are bare.
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bammax

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Join date : 2009-02-22
Age : 36
Location : Mansfield, Ma

PostSubject: Re: Drum to Disc?   Wed Jul 07, 2010 1:25 am

Master and proportioning valve is the same for drums or disks. Just need to do the bolt mod to even it out better.
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Waldo617

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Location : Milton

PostSubject: Re: Drum to Disc?   Wed Jul 07, 2010 1:26 am

what is the brake bolt mod exactly?

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Tomz9C1

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Join date : 2009-01-21
Age : 54
Location : Rumford, Maine

PostSubject: Re: Drum to Disc?   Wed Jul 07, 2010 8:13 am

bammax wrote:
Master and proportioning valve is the same for drums or disks. Just need to do the bolt mod to even it out better.
I read somewhere that it's a waste of time to do the Mod on drums. I have both and the discs have a better response, instead of getting a "nose dive" effect with the drums, the discs "squat" the car down.
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bammax

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Join date : 2009-02-22
Age : 36
Location : Mansfield, Ma

PostSubject: Re: Drum to Disc?   Wed Jul 07, 2010 10:27 am

Tomz9C1 wrote:
bammax wrote:
Master and proportioning valve is the same for drums or disks. Just need to do the bolt mod to even it out better.
I read somewhere that it's a waste of time to do the Mod on drums. I have both and the discs have a better response, instead of getting a "nose dive" effect with the drums, the discs "squat" the car down.

That comment was directed at you. When you swap to rear disks you might want to do the mod to better even out the front to rear bias since you'll have more stopping power in the rear. It's useless on a drum rear since the system is already designed for that setup.
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