Does anybody know if the 1968 front drum brake spindle are the same as 1969-1972 I have a freind that has alot of chevelle's he told me that the drum and disc brake front spindles are the same on 1969 - 1972. He wasn't sure about 1968 but he said I can have a set of 1972 if I need them for my car to do the conversion.

Does anybody know if the 1968 front drum brake spindle are the same as 1969-1972 I have a freind that has alot of chevelle's he told me that the drum and disc brake front spindles are the same on 1969 - 1972. He wasn't sure about 1968 but he said I can have a set of 1972 if I need them for my car to do the conversion.

68-72 drum spindle are the same, but 68 disc's were the 4 piston type (and a pain in the a$$ to rebuild http://forums.performanceyears.com/g...s/icon_mad.gif). 69-72 disc are all the same and you can buy the calipers rebuilt from the parts stores http://forums.performanceyears.com/g.../icon_wink.gif. If your going to get them from the junk yard, just get the spindles, bolts and lines. Buy everything else new/rebuilt http://forums.performanceyears.com/g.../icon_cool.gif.

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Thanks Jack

I can rotors and calipers from a local parts store and I already have caliper brackets for a 72. I still need brake booster, dust covers lines, hoses and master cylinder. I know were several boosters are in the junk yard or should I go new?

Drum spindles for '64-67 & '68-72 A-bodys are not the same as '67-72 A-body disc spindles. In order to modify later drum spindles, have built both a fixture to trim the boss down when positioning drum brake spindle on the chopsaw. Without this fixture, the spindle wanders on the chopsaw table & the chopsaw blade ruins more spindles than it helps convert. Also need another fixture to propperly position the spindle on the mill to cleanup, then counterbore, & finally re-tap the drum spindle. Lastly, have to have the special 7/8" long 15x16" head bolts which attach the caliper bracket to the disc spindle, these are finally avail in the aftermarket. Only 1" long versions can be found through bolt houses.

What exactly are the differences?
A friend of mine put a setup from a 1970 monte Carlo on his 68 GTO with no problems other than having to buy different brake hoses.
I was going to do the same thing to my 68.

http://ourworld.compuserve.com/homep..._brake_spindle

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68 Lemans 350/th350/fab9(3.89s, locker, SS axles)/NOS Cheater kit

I need to get off my lazy butt and get my car back to the track......

67-72 disc spindles are all the same but the drum ones from 64-72 are slightly different but can be machined down to accept the disc brake caliper bracket. Thats what all the disc brake companies used to do years ago.

Although the caliper bracket is different from 67-68 because of the 4 picton caliper the spindle is the same from 67-72. The backing plate and caliper bracket are 67-68 and 69-72. the valves are also all different.

here is a link http://www.inlinetube.com/disc%20bra...ion/dbrake.htm

or article http://www.inlinetube.com/install%20...y%20Valves.htm

The first year for disc brakes on GM A-body products is 1967. All cars before this point in time had four wheel drum brakes. Disc brakes were introduced as an option from 1967-1972. Starting in the 1973 model year front disc brakes were standard and front drums were no longer available. When disc brakes were developed so was the dual master cylinder, so all 1967 and newer cars had dual masters. Disc brakes required different pressures so the master was divided into two halves to provide pressure to the front and rear separately. This also meant that if a front line blew out the car would still have pressure to the rear brakes and vise versa.

The first thing we have to clear up, is that all 67-68 Factory disc brake cars came with dual piston calipers, if the car is a 69-72 it had single piston calipers. Most after market sets come with the later 69-72 single piston calipers but this is not technically factory correct for the 67-68 cars. The single piston setup will bolt on all the 64-72 GM A-body's. The first issue to converting a car to disc brakes is what kind of car is it. If the car is all factory correct and that is a concern, single piston calipers on a 67 or 68 car will certainly catch the judges eye and throw up a red flag. If the car is a driver or modified car no one will care if it has the single piston or dual piston calipers. The first question we ask at Inline Tube is are you looking for original appearance or are you looking for something that just bolts on and appearance may not be an issue.

As long as your going to the trouble to put on disc brakes why not change the car over to negative roll steering? Then you would be able to stop, go around turns properly and increase tire mileage.

Don

Psst, this thread was almost 7 years old. :D