cleaning up rusty rotors
#167812
12/15/08 04:30 AM
12/15/08 04:30 AM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
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Marysville, O-H-I-O
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is it ok to blast rotors to clean them up, then have them turned afterwards? I have a set of rotors that I got off a junk yard axle, and they're covered in surface rust all over. they definitly need turned, which will clean up the contact area, but I'd also like to clean up the rest of it as well--maybe hit it with some paint on the non-contact areas. but I thought I read on here where itwas not a good idea to sandblast disc rotors. any truth to this? I don't see why it could be a problem, especially if you have them turned afterwards.
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Re: cleaning up rusty rotors
[Re: 70Cuda383]
#167813
12/15/08 04:34 AM
12/15/08 04:34 AM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
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oh yea, and is there any way to "surface" brake pads? the pads that are with these brakes have a LOT of life left in them, but the fact that they haven't been used in over a year makes me wonder, and I'd feel better knowing that the pads had fresh smooth material to match what will be freshly turned discs--is there a way to do this? or are they simply to be thrown away?
...or is it ok to use pads that haven't been used in over a year, just resting up against the rotor?
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Re: cleaning up rusty rotors
[Re: 70Cuda383]
#167814
12/15/08 07:47 AM
12/15/08 07:47 AM
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Joined: Jan 2003
Posts: 21,076 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,076
Niles , Ohio
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If the rotors arent rusted away just turning them will clean them up.You could blast the non contact area as long as you dont hit the bearing races unless you change them.If the pads are junk yard I wouldnt trust them.New pads are less than 30 bucks so why chance your life to them.I paintes the hats on my rotors.Rocky
Chrysler Firepower
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Re: cleaning up rusty rotors
[Re: 70Cuda383]
#167816
12/15/08 09:38 AM
12/15/08 09:38 AM
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Joined: Oct 2005
Posts: 708 Mechanic Falls, Maine
4BBodies
mopar addict
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mopar addict
Joined: Oct 2005
Posts: 708
Mechanic Falls, Maine
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Hey Kaptain, my rotors were like yours, surface rusted, and basically "scummy," I bead blasted them, turned them, painted, then added new studs. I got my new pads from Parts America online, they were like $12 ??!!
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Re: cleaning up rusty rotors
[Re: 70Cuda383]
#167821
12/15/08 03:12 PM
12/15/08 03:12 PM
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Joined: Sep 2005
Posts: 6,516 Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
is there any way to "surface" brake pads?
Wilwood recommends using 80 grit for scuffing both rotor and pad to "re-bed" them. I like 120 grit, but Wilwood has built a lot more cars than me.
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Re: cleaning up rusty rotors
[Re: moparmojo]
#167825
12/15/08 11:52 PM
12/15/08 11:52 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
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Quote:
How to you go about protecting the bearing area, for the grit and stuff?
I've used tape before to protect an area from the blaster. duct tape works well, but can leave a sticky residue. electical tape doesn't leave as much residue, but it's also not as sticky.
anything soft that the media will bounce off of will work, especially if you take care and not aim the nozzle at it.
sounds like a plan, blast them it is! I thought I read on here once where someone blasted some rotors and 5 or 6 folks responded saying that it was a big no no, and that they'd never use rotors that were sand blasted.
I guess if I ask again next week, I'll get 10 people saying they did it once and ruined their rotors
allwell. I'll blast the hub of these and let the machine shop turn them to take care of the rest
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Re: cleaning up rusty rotors
[Re: 70Cuda383]
#167829
12/16/08 09:36 AM
12/16/08 09:36 AM
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Joined: Mar 2007
Posts: 3,285 West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,285
West Coast, USA
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Protect the races, blast the rotors and calipers(while assembled and with the hole for the brake line plugged)sand the glaze off the pads with sand paper, clean everything with brake clean, put fresh seals on the calipers, paint the cast surfaces, and carefully put it back together. Check for any binding, warp or other signs of problems. These are your brakes after all.
You can also scuff the glaze off your rotors between pad changes. I have really never had rotors turned unless they are warped or heavily grooved. There is little real need, and it just makes them thinner/weaker. If they are warped or damaged, I just replace them with new ones as they are relatively cheap.
I also typically use cheap organic pads for the first 3-4k miles on new rotors , then swap in a fresh set of semi-metalic pads. It gives the organic pads a chance to burn off the oils etc from new rotors.
It is very important to bed your brakes in as well. You start by using multiple stops with light pedal pressure at low speed and gradually increase both speed and the stopping effort until you bed them in. Make sure to let them cool during the process. Don't let them get too hot while your doing this! You should also do this to your parking brake. It will hold a lot better afterwords.
Be careful and be smart, which it sounds like you already are.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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