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View Full Version : Low Budget: convert 4-wheel drums to 4-wheel discs for $800!

Derek69SS
01-25-2006, 01:47 PM
Jim asked me yesterday on Chat about my brakes, so I figured if I'm compiling info, I might as well share with anyone interested :)

All prices and part-#s listed are current as of today, 01-25-06

Modifying stock DRUM spindles to use stock 11” DISC BRAKES on ’67-69 F-body (Camaro, Firebird), ’68-74 X-body (Nova, Omega, Ventura, Appollo), and ’64-72 A-body (Malibu/Chevelle, Monte Carlo, El Camino, Sprint, Skylark/GS, Cutlass/442, LeMans/GTO)

Spindles: $0 (assuming your car has drum brakes on it.) These can be “converted” to disc brake spindles with an angle grinder in about 20 minutes each.

Caliper Brackets (http://www.ss396.com/mm5/merchant.mvc?Screen=PROD&Store_Code=chevellecamino&Product_Code=FM-2501&Category_Code=BRAKES) .................................................. ............$79.95 pr +shipping
Bolts (http://www.ss396.com/mm5/merchant.mvc?Screen=PROD&Store_Code=chevellecamino&Product_Code=BCP-373&Category_Code=BRAKES) .................................................. ..........................$1.95ea (x2) = $2.90 pr
Backing Plates (http://www.ss396.com/mm5/merchant.mvc?Screen=PROD&Store_Code=chevellecamino&Product_Code=FPP-11J&Category_Code=BRAKES) (optional - you don't really need these)............................$39.95 pr

*note: I used Ground-Up’s prices because their website is easiest to navigate. Other sources may be cheaper, or have cheaper shipping*

The procedure for making disc spindles from drum spindles is simple. Bolt the caliper bracket tight. (but loose enough so you can rotate the bracket) to the lower bolt boss on the spindle. Then start grinding on the upper bolt boss on the spindle until the bracket can sit flat on both the upper, and lower surfaces. You will need to remove about 5/16-3/8” from the upper boss (estimated - I never actually measured).

The rest of the parts can be bought at any parts-store… NAPA part numbers and prices: (retail price)

Calipers w/ hardware #542-2016………17.75 ea + $9.00 core = $53.50 pr
- they include the caliper bolts and copper washers for the brake line.
Premium Brake pad set #AE728A…………….…….........…….……….. $30.47 pr
Economy “Loaded” Calipers…..…$28.70 ea + $9.00 core = $75.40 pr
Premium Rotors #85532 …………………………..…….$77.31 ea (x2) = $154.62 pr
Economy Rotors #4885532………….....…. $46.88 ea (x2) =$93.76 pr
Inner bearings #BR6…………………………. $7.31 ea (x2) = $14.62 pr
Outer bearing #BR2…………………………… $7.45 ea (x2) = $14.90 pr
Seal #17187………………………….…..……… $2.08 ea (x2) = $4.16 pr
69 camaro brake hose #36672……....……$18.92 ea (x2) = $37.84 pr
– on chevelles, drum cars had a different bracket, and the camaro hose fits better.
Banjo bolt #82701…………………….……… $3.46 ea (x2) = $6.92 pr

Total: (Economy)…………………………………….......………….$330.45
Total: (Premium)................…………………………………………………………..$ 439.83

REAR Disc Brakes for GM 10-bolt &12-bolt

Brackets (http://www.steeltechsolutions.com/REAR_DISC_PAGE_CODE.html) from Steeltech Solutions: .....................$89/pr +$10 shipping = $99

Again, the rest can be bought at any Parts Store (Prices & Part #s are from NAPA):

Rotors – Rear 11” rotors for ’80 Trans-Am #85774... $41.16 ea (x2) = $82.32 pr
Loaded Calipers (w/ E-brake)…...………. $127.46 ea + $66 core = $386.92 pr
– 85 Caddy Seville rear disc calipers.
Loaded Calipers (w/o E-brake)……….....$34.75 ea + $22 core = $113.50 pr
– 85 Camaro FRONT calipers. (I think I bought mine for ½ that price from Auto Zone)
Hoses – for ‘85 Camaro front……………………….$13.79 (x2) = $27.58 pr

Sub-Total w/o E-brake……………………...……….………………. $322.40
Sub-Total w/ E-brake: $595.82 -cheaper just to buy the kit from Steeltech: $499.00

Then to make everything work properly, I used:

’68 Corvette manual Master Cylinder (NAPA #101371)….…............$20.69
Power Brake booster – ’69 Chevelle (NAPA #5471105) ………….....$81.87
Wilwood adjustable proportioning valve (Summit Racing)……….......$50.00

Sub-Total:..................…………………………………………………$152.56
My Sub-Total because I used a $25 used booster from a junk-yard:..…… $95.69

TOTAL (With all NEW parts, but done as cheap as possible)….…..$805.41
(upgraded parts prices listed so you can calculate your costs accordingly)
Silver69Camaro
01-25-2006, 02:37 PM
I ran those numbers a while back too. You really can do it for cheap (w/o E-brake, that is).

But here's where I got hung up. Those Caddy calipers are aweful, bad enough to where I'd rather use 11" drums. If you can use a different caliper (w/o E Brake like you mentioned) you'd be much better off. If you want to keep the e-Brake, go aftermarket or modify the Ford SVO rear setup to work with your housing ends and axle offset.
Derek69SS
01-25-2006, 02:51 PM
Those Caddy calipers are aweful, bad enough to where I'd rather use 11" drums. If you can use a different caliper (w/o E Brake like you mentioned) you'd be much better off. If you want to keep the e-Brake, go aftermarket or modify the Ford SVO rear setup to work with your housing ends and axle offset.A lot of guys use a motorcycle brake on the pinion like this one from www.einstyn.com/
http://home.comcast.net/~petelohr/einstyn1/p-brake10a.jpg

I'm a flatlander with an automatic. I haven't used a parking brake in years (except to do 180s on ice in my bonneville :D ) so I didn't worry about it.
SoCal69
01-25-2006, 05:55 PM
I bolted a set of 2002 LS1 Camaro rears on mine. :thumbsup: Fit like a glove and the e-brake is easy to hook up. Tried SSBC rears but I couldn't live with the e-brake and couldn't get them to tell me what the rotors were.
Derek69SS
01-25-2006, 06:00 PM
I bolted a set of 2002 LS1 Camaro rears on mine. :thumbsup: Fit like a glove and the e-brake is easy to hook up. Tried SSBC rears but I couldn't live with the e-brake and couldn't get them to tell me what the rotors were.What size rotors do the LT1 and LS1 brakes have? Will they fit in a 15" wheel?

I wouldn't want to be limited to 17" on the rear in-case I decide to bolt on some cheap slicks and go drag-racing.
MaxHarvard
01-25-2006, 06:04 PM
I used a set of calipers from the front of an 80 camaro... installed perfectly and work really nicely... just no e-brake.
dougs68ss
01-25-2006, 07:01 PM
check out performanceonline.com they have great kits for front and rear 13'' with pb caliper ,no waiting and reasonable.
SoCal69
01-25-2006, 07:56 PM
What size rotors do the LT1 and LS1 brakes have? Will they fit in a 15" wheel?

I wouldn't want to be limited to 17" on the rear in-case I decide to bolt on some cheap slicks and go drag-racing.

Rotors are 12" on LS1. I'm not sure what dia. wheel will clear it.
62fairlane
01-28-2006, 07:25 AM
I knwo it isn't an f-body but I did mine for about $400. I just pressed the old drum brake hubs off the drums on the front so I could stick late model mustang rotors on them. then made a bracket to bolt in place of the drum backing plate to hold the caliper, in back just used the stock stuff for the mustang also and am just gonna weld it to the housing...unless I get fancy and build a bracket to bolt it on with. I got $100 in the rears and $150 on the fronts and then another $150 in the stock hydraboost setup (with master and prop valve)
ohcbird
01-28-2006, 10:39 PM
If you run the stock setup from a 4th gen, you can put a 15" wheel back there- I ran different Weld's on my 98 SS (from 15x8 to 15x10).
Ummgawa
02-01-2006, 06:42 PM
ttt, thanks derek
Derek69SS
02-02-2006, 06:03 AM
No problem Jim :thumbsup:

If there's one thing I'm good at, it's figuring out how to do things cheaply :lol:
Ummgawa
03-24-2006, 01:16 PM
tttop
projekt70chevelle
04-03-2006, 01:20 PM
Well so far my brake upgrade has cost me a whopping $470...

I'm using the 13" c5 front brakes and the ls1 12" rear discs.
Only thing left to buy is the metal to make the necassary brackets for the caliper to spindle.
Derek69SS
04-03-2006, 02:19 PM
Well so far my brake upgrade has cost me a whopping $470...

I'm using the 13" c5 front brakes and the ls1 12" rear discs.
Only thing left to buy is the metal to make the necassary brackets for the caliper to spindle.
Details??? Does this include new MC, booster, proportioning valve, etc?
projekt70chevelle
04-03-2006, 04:41 PM
Details??? Does this include new MC, booster, proportioning valve, etc?
Only thing I havent got is the prop. valve but ebay has them up for 30-40 shipped. Being a college student and working part time I've learned to be patient and have learned to branch out...
Ummgawa
05-01-2006, 06:01 PM
back to top
Derek69SS
05-01-2006, 06:52 PM
Jim, did you do the swap yet? How'd it go? (hoping I didn't miss any important details :) )
Garhett
05-16-2006, 01:06 PM
I converted from 4 wheel drums to 4 wheel disc about 6 years ago for less than $500 turn key. I went to my local dealership and looked up the spindle casting number for a '69 camaro with front discs and then looked up what cars it came on. I found a donor car in a local junk yard (I think it was a '72 Nova) and popped the whole assembly off which was a perfect bolt on for my '69. The front brakes cost me $70 bucks.

I then replaced the rear axle with an original disc brake axle out of a '78 "smokey and the bandit" trans am. The rear end only cost me $350 but the install turned out to be a little more difficult because I had to move the spring perches but after a little measuring and welding I was good to go. I'm sure there is a better rear end to use that would be a better fit, but I got a good deal on it.

Problems?
- My original e-brake cables wouldn't work and I never got replacements because they supposedly cost $300.
- I had to get a longer brake line to connect the rear axle.
- I still have the maunal master cylinder that was for the 4 wheel drums. It seems to be proportioned fine but it just doesn't move quite enough fluid for the discs. (It will lock them up on the second pump.) My research has led me to believe that a master cylinder for a '69 corvette with 4 wheel disc is what I need.

Disclaimer:
I did this swap 6 or 7 years ago. Do your research before buying to double check me.