Rear Rotors

[Michael 427]

I finally solved my problem of the 1967 pulling or darting to right, the rotors had cracks in them, what I mean the fins were cracked, after installing the new rotors problem was eliminated, I have noticed the cracks in the rear rotors also, so therefore I will try to replace them, any idea what is the beat way to remove rear rotors without pulling axle, all the rotors were the original ones from the factory not sure what caused the cracks,


Thanks

Michael 427

 

[00fxd]

You will be able to remove the rotors by drilling out the rivets that hold them to the spindle. The rivets apparantley were used for ease of assembley at the factory. Once the rivets are gone, unbolt the calipers and lift them off the rotors, you can leave your steel hydraulic lines attached if you keep the movement to a minimum. When installing the new rotors, make sure to clean all surfaces of any rust or dirt, you want them running as true as posible. I think I'd address your cracked rotors asap.

 

[JohnZ]

It's particularly important on the rears to measure the lateral runout of the new rotors with a dial indicator setup to make sure there's no more than .002"-.003" total indicated runout (difference between the highest and lowest reading); there is more variability at the rear due to the added axial play in the rear spindle bearings. More than .004"-.005" lateral runout at the rear is likely to cause "air-pumping" into the rear calipers and loss of pedal height.

 

[Michael 427]

John Z and 00fxd Thanks for the help, I will let you know how the project goes, John Z any thoughts on how the rotors would crack at the fins.

Thanks
Michael 427

 

[JohnZ]

Anything is possible after 36 years of heat cycling, corrosion, etc, especially if they saw extremely hard use at some point. Barring those issues, Corvette rotors pretty much last forever if standard GM pads are used; whizbang "race" pads will wear them down, and the thinner they get, the more likely they are to develop stress cracks.

 

[00fxd]

After arriving in my home province with my new to me '65 roadster, I had to have the usual out of province inspection performed. It was determined that my rotors were under sized. I had to have new rotors for licencing even tho the brakes worked very well, high hard pedal, new stainless calipers and lines etc. Been through the air pumping with my '74 years ago. Very truamatic. Crappy brakes for a year til I got it figued out. Bleeding them once a week......... O well, gotta do it. Installed 4 new jobber rotors from a local jobber. It's been over a month now and every thing seems ok so far, thank God.