Modify drum brake spindles to fit disc brakes - Chevelle Tech
2005 General Tech Forum from 2005

 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 18 (permalink) Old Mar 20th, 05, 1:16 PM Thread Starter
 
Join Date: Mar 2003
Posts: 3
Cool Modify drum brake spindles to fit disc brakes

Modify drum brake spindles to fit disc brakes.
The top mounting boss is to long on drum brake spindles. If it is cut down or machined down 1/2 to 3/4 inch it turns drum brake spindles to disc brake spindles.
My question is does anyone know for sure the exact amount that has to be removed?
I have heard .610 and also .750
Is either one correct?
Thank You.
Dr.Dell is offline  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old Mar 21st, 05, 11:55 AM
Lifetime Premium Member
 
Join Date: May 2001
Location: Northern VA
Posts: 2,171
Re: Modify drum brake spindles to fit disc brakes

Good question. I'd also like to see before and after pictures of the mod.

Herb Sr
'67 Coupe (frame-off)
489BB w/ Straub custom roller cam
M20/3.73 Eaton posi
http://www.chevelles.com/showroom/data/500/medium/Ext08.JPG
Herb is offline  
post #3 of 18 (permalink) Old Mar 21st, 05, 1:09 PM
Gold Founding Member
Administrator
 
Join Date: Aug 1998
Location: near Kansas City
Posts: 56,594
Garage
Dean is offline  
post #4 of 18 (permalink) Old Mar 21st, 05, 3:38 PM
Gold Member
 
Join Date: Aug 1998
Location: Snohomish, Wa
Posts: 484
Re: Modify drum brake spindles to fit disc brakes

I've done this modification several times. I found the amount to cut off different on all the spindles. I attached the caliper bracket to the lower mount, snug but not tight and then rotated the bracket up until it touched the upper pivot bolt boss and scribed a line. I used a hacksaw to remove the majority of the boss and a Bridgeport mill to machine them flat. The flats on the backside of the steering arm mounts are plumb to the axle centerline and parallel to the surface of the boss. Oh, BTW, this only pertains to 69 and later spindles. You can modify earlier spindles, it's just a little more work.

Cam
Cam Sweet is offline  
post #5 of 18 (permalink) Old Mar 31st, 05, 3:49 PM
Team Member
 
Join Date: Sep 2002
Location: Sparta, TN
Posts: 4,853
Re: Modify drum brake spindles to fit disc brakes

Cam,

Don't you have to bore the boss and retap it too? I was going to do this myself, but decided not to after reading several posts here saying that the hole isn't deep enough after you cut the boss. Or do -69 and up have a deeper hole than the earlier ones?
Olle is offline  
post #6 of 18 (permalink) Old Mar 31st, 05, 4:11 PM
Gold Member
 
Join Date: Aug 1998
Location: Snohomish, Wa
Posts: 484
Re: Modify drum brake spindles to fit disc brakes

Yes, 69 and up have the correct hole/thread. Pre-69 do require drilling out the hole and retapping for the 1/2" bolt. Also on pre-69 the steering arm mounting bolts are smaller diameter so the you need to fashion a shim to take up the slop in the caliper bracket hole.

Cam
Cam Sweet is offline  
post #7 of 18 (permalink) Old Mar 31st, 05, 4:38 PM
Moderator
Hey You!
 
Join Date: Feb 2000
Location: Temple City, Ca
Posts: 7,762
Re: Modify drum brake spindles to fit disc brakes

The later spindles seem to be drilled deep enough. On the 4 I cut, I did have to tap a little further with a bottom tap. However, the hole was deep enough to tighten the bolt into it.

Yo-ho Yo-ho a pirate's life for me.
John_Muha is offline  
post #8 of 18 (permalink) Old Apr 1st, 05, 1:35 PM
Team Member
 
Join Date: Sep 2002
Location: Sparta, TN
Posts: 4,853
Re: Modify drum brake spindles to fit disc brakes

Cool I just got through changing to disc brakes, so I have a set of drum spindles left over. I might give it a try just for fun.
Olle is offline  
post #9 of 18 (permalink) Old Apr 5th, 05, 11:56 AM
Senior Tech Team
 
Join Date: Nov 2004
Location: washington,state
Posts: 1,068
Talking Re: Modify drum brake spindles to fit disc brakes

hello,i have a 1969 chevelle, i would like to convert to disc brakes using the infomation you guys are talking about,but i am totaly confused. does anyone have a more detailed instructions for making my spindles work. i have the complete spindle assembly,roter,caliper off a 76 nova.exactly what do i do to convert.i am a mechanic and have all the tools i need. thank you. lance.
lemonice is offline  
post #10 of 18 (permalink) Old Apr 5th, 05, 4:50 PM
Gold Member
 
Join Date: Aug 1998
Location: Snohomish, Wa
Posts: 484
Re: Modify drum brake spindles to fit disc brakes

Well, Lance, I suspect that the spindle assemblies you have off of the 76 Nova classify as the "tall spindle" swap, of which I know nothing about. Your original drum brake spindles can be modified to accept the caliper brackets for a standard 64-72 A body disc brake setup. The brackets are available aftermarket from our sponsor, GroundUp fo like $95. The rest of the swap comes from your favorite parts house. I don't believe anything from your Nova setup is usable unless you do the whole tall spindle upgrade.

Cam
Cam Sweet is offline  
post #11 of 18 (permalink) Old Apr 5th, 05, 8:45 PM
Senior Tech Team
 
Join Date: Nov 2004
Location: washington,state
Posts: 1,068
Re: Modify drum brake spindles to fit disc brakes

i guess i did sound a little confusing on my post. what i was trying to say is that i want to do the drum to disc swap using my exsisting drum spindles like they were explaning in the above post.i thought that since i had the 76 nova spindle setup, that i could use those rotors and calipers.
lemonice is offline  
post #12 of 18 (permalink) Old Apr 10th, 05, 10:40 PM
Super Mod
Mr Bill
 
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 10,286
Re: Modify drum brake spindles to fit disc brakes

So,

Are you guys saying that there is no other difference between the drum and disc spindles ???? Has anybody had them side by side to compare ? I am thinking about switching to discs and that would sure make it nice since my original drum spindles have been bead blasted and powder coated. All I would have to do is put them up in the mill and carve away

Bill Koustenis
Advanced Automotive Machine
Waldorf Md

Enginerepairshop.com

1971 Heavy Chevy - original owner
1984 Buick Riviera - original owner (Wife's car)
Team Chevelle #100
BillK is offline  
post #13 of 18 (permalink) Old Apr 11th, 05, 10:21 AM
Gold Member
 
Join Date: Aug 1998
Location: Snohomish, Wa
Posts: 484
Re: Modify drum brake spindles to fit disc brakes

That's it, Bill. Like I previously mentioned, I get the amount to knock off by seeing where the bracket would rest by swinging it up attached only by the lower mount. I hacksaw off the majority of the boss and then clean it up with the mill. I clamp the spindle down on the table with the backside of the steering arm mounting ears on the 3 side of a set of 1-2-3 blocks. Man, I really ought to snap a set of pics... I have another set to do for a buddy. Hope this helps.

Cam
Cam Sweet is offline  
post #14 of 18 (permalink) Old Apr 14th, 05, 1:25 PM
Senior Tech Team
 
Join Date: Nov 2004
Location: washington,state
Posts: 1,068
Talking Re: Modify drum brake spindles to fit disc brakes

after you do this what rotor do you use and what caliper do you use? thank you.
lemonice is offline  
post #15 of 18 (permalink) Old Apr 14th, 05, 1:34 PM
Team Member
 
Join Date: Sep 2002
Location: Sparta, TN
Posts: 4,853
Re: Modify drum brake spindles to fit disc brakes

Quote:
Originally Posted by lemonice
after you do this what rotor do you use and what caliper do you use? thank you.
68 - 72 parts will fit.
Olle is offline  
Sponsored Links
Advertisement
 
 

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevelle Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address. Note, you will be sent a confirmation request to this address.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Can I use my Drum Spindles for a disc brake conversion? JR67 1999 -- 17 Jan 30th, 08 10:02 AM
Disc Brake Upgrades--Jury Pool Statements 2 Ike Brakes, Suspension & Steering 3 Dec 26th, 07 1:15 PM
Difference between Master Cylinder/Booster for Disc and Drum Brakes?? northern 396 Brakes, Suspension & Steering 12 Mar 11th, 05 5:58 PM
simple rear disc brakes FO_FDYFO Brakes, Suspension & Steering 6 Sep 2nd, 03 10:09 AM
Disc Brake Upgrades--Jury Pool Statements Ike Brakes, Suspension & Steering 7 Jul 11th, 03 6:15 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome