WHY Can't I Disk The Rear - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-05-2006, 01:20 AM   #21
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F88, I'll dig it up, but I literally searched online for the best price I could find that had free shipping.

History:

Warped the stockers (4 months after I bought the car with 65k on the ticker, coming down a long mountain pass in the summer).

Installed the 'test set' of RSM'*. They were slotted/hardened, used Raybestos Quiet-stop pads (same as ssei1995 2 posts above, GREAT pads). Warped them in 3 months, but keep in mind I was ASKED and BEGGED to trash them, or at least try. They were NOT bad enough that I couldn't turn them, so I did (yes, did it myself). They lasted another 6 months before they warped again, but most of that time was during the 'cooler' months.

When the car was coming back up from the trans explosion and top-end work this summer, lilpooky replaced the RSM'* with the Powerslots. Very similar design and 'claims' from the manufacturer. That was Mid-august. They seem to be holding up better than the RSM'*. And I've put them through alot while testing/tuning the car since the top end work. I'm impressed.

I'll try to dig up my source for the rotors. I think I still have the receipt.
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Old 01-05-2006, 01:43 PM   #22
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Keep in mind it is the tires that stop the car, the brakes stop the tires.
The biggest advantage to rear disks is easier maintenance. I have yet to see self adjusting drums that consistantly maintain adjustment.
If you use good quality shoes as sugested earlier in this thread and make adjusting the drums part of your normal maintenance routine you will find they work very well. (Change oil = adjust brakes)
Some rear disk setups actually add weight to the rear. This unsprung weight makes the suspension work harder and has a negative impact on handling.
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Old 01-05-2006, 04:32 PM   #23
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Greyhare, you said that some rear brake system add weight and negative affect the handling. Is the weight in the back a good thing, I mean it adds balance and takes a bit of weight and work off the front brakes by transferring to the back. I thought 50/50 was the best for handling so if a bit of weight is in the back of a front heavy car, wouldn't that improve handling and braking too?

Fuel
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Old 01-05-2006, 05:32 PM   #24
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It is always better to remove or relocate weight to gain the desired distribution or balance instead of adding it.

The real problem is unsprung weight.


Here are some brief explinations of unsprung weight:
http://www.musclecarclub.com/library/tech/weight.shtml
http://en.wikipedia.org/wiki/Unsprung_weight
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Old 01-05-2006, 06:08 PM   #25
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I see what you're saying Greyhare. I knew about unsprung weight but I read the links, now I really understand what it means, I just assumed that unsprung weight was just dead weight such as spinners, other unecessary items on the axle. I see how that would hurt the brakes and the suspension parts too.

Thanks for refreshing my mind and clarifying the brake balance thing.

Fuel
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