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Old 06-30-2003, 11:58 PM
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Rotors?

I need to no how to check and see if the rotors can be turned? I am fixing up a 69 camaro ss the first thing I am doing is get the
brakes working on it so I can get it out of the yard.One side is frozen up on the front disc brakes how do you get it unfroze.Also wanting to no how to rebuild the calipers on it to all I now is to buy a kit for $1.99 help me out here.






TONYMAC!!!!
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Old 07-01-2003, 01:13 AM
akm akm is offline
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i for get the name of the tool used to check that but you put it on the lowest of both sides and it measures how much meat you have left. i don't know the lowest specs but any place that turns them will (should). SOMEONE PLEASE TELL THIS MAN THE NAME OF THAT TOOL(and me).
what i do to get the brakes un-stuck is crack the bleeder open and take a pry bar and put it somewhere between the rotor and caliper and pry it open.
rebuilding calipers--i would just buy brand spankin' new ones, not the rebuilt ones.
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Old 07-01-2003, 01:56 AM
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Most shops will use a DTI guage (Disc Thickness Indicating Guage)
Normal disc wear creates a ridge that runs around the external perimeter and corresponds to an unworn part.

The ridge is one of the wear indicaotrs, when its clearly visible the residual thickness of the disc between the two braking surfaces. The difference should be compared to the minimum thickness etched on the outer rim of the disc.

Each manufacturer determines the minimal thickness.

Other checks are run out and planarity. Run out can be determined by taking ameasurement on the unworn external edge. This will be taken with the DTI gauge. Heat and the cooling process has allot to do with the planarity and the distortion of the disc. Lobes may appear and the DTO guage will indicate a series of high and low points.

Another thing that causes planarity is the incorrect tightening toque of the securing disc bolts.

If the disc are worn and your not sure about them, change them and get new ones. Safety first.
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Old 07-01-2003, 04:25 AM
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A simple rotor micrometer will tell you if the rotors are machinable. If you remove them to be machined any parts store that machines rotors will mic them out for you. Loaed calipers are the easiest way to go since they are a bolt on job and come with pads. An air compressor is usually needed to rebuild your old ones. Check the front hoses to the calipers for any cracks or damage, replace if needed. A dial-indicator is used to check for run-out which is usually checked because of brake vibrations. Most slight variances will be machined out when they're cut, whovever machines them will handle that. Must go to work, any other questions just ask. Oh yea, a small prybar or large screwdriver will usually pry loose the old calipers.


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