I have a 1970 Duster with the 4 inch bolt pattern. I have already purchased new steel wheels for it and had them powder coated. I had been giving some thought to converting the front brakes over to power disc brakes like we did with my Challenger. I contacted Master Power Brakes and was told by them that you cannot do that unless you convert to the 4.5 bolt pattern. Obviously I already have alot of $$ sunk in the small bolt wheels and was just wondering if anyone knows of a company that sells the conversion kits for the 4 inch pattern ? Thanks in advance for any responses, Ron

Get a factory small bolt disc setup..........

Jim- Thanks for the reply- You will have to excuse my stupidity in asking but is the factory set up still available and if so do you know how I would locate one ? Thanks, Ron

Stainless Steel Brakes version has both bolt patterns:

http://www.ssbrakes.com/

vm

They are available used, but fresh calipers and rotors are available as are rebuild parts.

The scarebird conversion keeps the 4" pattern too.

I just put the Wilwood kit on my 71 Valiant. I had drum brakes and the Wilwoods fit on the drum spindle. Easy to install. You have to buy the new lines and adapters.

If it is important to stay origanal OK. But if you want to stop with 4 pistons give Mancini a call, talk to Art.

I think I might use the scarebird brackets myself, all the parts I can get at NAPA, AZ or Advanced..

Here are the directions and parts list..

Mopar “A” body 1965-72 10”, 1960-72 9”
Front Disc brake conversion instructions
Crack front wheel nuts loose, chock up rear wheels. Jack up front end of car, support outer control arms with jackstands. Remove front wheels, drum/hub assembly. Put a few drops of penetrant oil on brakeline nuts where they screw into rubber lines.
Take drum/hub assembly and remove studs. Best way to do this is to center punch the head from the inside. Then pilot drill about ½” deep, then drill off head with 5/8” diameter bit. Clean off wheel surface and register with wire wheel or beadblaster. Replace studs with ¼” longer or more studs, such as NAPA #641-1563 (10”) or #641-1560 (9”)
Disconnect brake flexible line at frame by unscrewing hardline nut with flare wrench, then removing clip. Undo and remove drum retaining bolts. Remove drum backing plate, hose and all drum hardware in one assembly. Clean off spindle assembly well.
Place adapter plate over spindle with caliper bolt retaining nut welds facing inward for the Ten’s, outward for the Nines, and caliper opening to the rear for Ten’s, Nine’s goes forward of the axle. Make sure no dirt is lodged between spindle and plate.
Drill out wheel stud holes with pattern supplied. Cut out pattern with scissors, then spray with light oil or WD-40 and lay on rotor. Lightly punch for holes, then remove and punch harder. Drill out holes ½” diameter. Verify that rotor lays flat against hub by fitting rotor backwards onto hub. If the stud knurls interfere with rotor, countersink stud holes in rotor to clear knurls.
Clean and repack wheel bearings. Install new seal. Assemble hub onto spindle, tighten outer nut to spec, then secure with keeper, new cotter pin and dustcap.
Install center ring on hub. Place rotor onto hub, and run two or three lugnuts down finger tight to retain rotor. Wipe down rotor with alcohol, lacquer thinner or other cleaner.
Wash hands! Rotor must be squeaky clean.
Lubricate caliper contact point of brackets. Slide assembly into caliper bracket. Make sure bleed screw faces upward- if not, reverse sides. We recommend buying loaded calipers. Tighten caliper bolts to 35 foot-pounds. Check fitment and rotate rotor to check clearance. We used 1979 Seville front hydraulic hoses that are 15” long for the 10” drum units, 1979 Cadillac Eldorado front hoses that are 17” for the Nines. Install hose with new copper crush washers.
Master cylinder and proportioning valve specs are quite varied. I would recommend 1967-72 Dart or similar disc master cylinder for best performance match available in both power and manual flavors. Plumb in an adjustable proportioning valve in the line going to the rear cylinders, or use a disc proportioning valve
Bench bleed disc master cylinder. Mount MC on car, then gravity bleed entire system first to eliminate most of the air, then pump bleed and test, otherwise your distribution block may jam from a pressure imbalance.
Replace wheels, install lug nuts, lower car and torque nuts to spec. Test drive carefully- no hard stops, a series of smooth stops will help bed in the pads properly.

Part Application NAPA Wagner Raybestos
Rotor 1990 Chevy Celebrity 85768 BD60678 5072 or 105072
Caliper, LH 1990 Chevy Celebrity 242-2066 L107084 RC4234
Caliper, RH 1990 Chevy Celebrity 242-2067 L107085 RC4233
Brake Hose (15”) 1979 Seville front 36845 F98912 BH36845
Brake Hose (17”) 1979-82 Eldorado front 36959/36960 F98914/98914 BH36959/3696
Brake pads 1990 Chevy Celebrity AE7136M MX215

*Verify fit and length before buying Scarebird Classic Brakes LLC 20 April 2007 Version C

Thanks again Guys- I really appreciate all the info