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TOPIC: Rear Brake Rotor ('02, 1600)
#253351
DKLAZ (User)
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Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
Can someone help me with what I should be looking for on my rear rotor? It seems like I went thru another set of rear brake pads way too fast (6000-ish miles)

My rear rotor isn't warped, and I can't feel/hear any drag, but I understand that they CAN wear out. In looking at pictures of them online, mine is definitely grooved (sort of like an old vinyl LP but coarser. I can also tell that the outer edge is thicker than the area that the pads contact.

I'm thinking that I might have ruined it once in the past when I ran the old pads way too thin.

Advice?

Thanks in advance,
DKLAZ
 
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#253357
Curt (Moderator)
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Re:Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
Check your rotor thickness it should be minimum 6.5mm or 0.26in any less than that they should be replaced. Make sure your caliper is working good and is clean.
 
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#253381
DKLAZ (User)
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Re:Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
Curt wrote:
Check your rotor thickness it should be minimum 6.5mm or 0.26in any less than that they should be replaced. Make sure your caliper is working good and is clean.

Looks like I'm inside that thickness, so I'll be ordering a new/used one.

Thanks for the specs Curt!

DKLAZ
 
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#253441
Big Bear (User)
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Re:Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
A thin rotor would not have worn those pads out quickly though. Do you use mostly rear brakes when you stop? Even still , they should have lasted longer than 6,000 miles. I use mostly front (80-20) and my fronts last 20,000 miles +. I would not be the least surprised if your caliper was sticking , hanging up just enough to let the bike roll , but constantly holding the pads to the rotor. Rebuilding a caliper is easy , so check it for drag , and if it needs it , go through it. BB
 
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#253449
DKLAZ (User)
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Re:Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
I've had it off for cleaning before, but nothing too detailed. I guess I just need to get into it deeper and really get the gunk out. I probably AM too heavy on the rear brakes....I'll work on that.

Is there a cleaner you'd recommend when I pull it apart and scrub it up?

DKLAZ
 
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#253452
Grizzly4444 (User)
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Re:Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
Have you measured the brake disc(rotor) deflection????? Service manual for 2003 states .15mm (.006inch) for both front and rear brake discs. The deflection is measured 1.5mm below the edge of the brake disc (rotor) You'll need a dial guage held at a right angle against the rotor surface to do this. Hope this helps.
 
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#253825
DKLAZ (User)
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Re:Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
So...should I notice a brake-dragging sound when rolling? I can't say I ever heard it before now, but it seems pretty obvious now. It's almost as if the calipers don't fully retract when I release the pedal.

Maybe my whole issue, the whole time has been dirty/gunked up calipers that don't retract? Anyway...I have the new pads. Any reccomendations for what to use for the cleaning job? And how far should I tear into them for a thorough cleaning?
Thanks,
DKLAZ
 
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#253834
hardone2get (User)
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Re:Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
DKLAZ wrote:
So...should I notice a brake-dragging sound when rolling? I can't say I ever heard it before now, but it seems pretty obvious now. It's almost as if the calipers don't fully retract when I release the pedal.

Maybe my whole issue, the whole time has been dirty/gunked up calipers that don't retract? Anyway...I have the new pads. Any reccomendations for what to use for the cleaning job? And how far should I tear into them for a thorough cleaning?
Thanks,
DKLAZ


First off have you put the bike up on a lift and spun the rear wheel? The wheel is not going to just spin freely has it has the belt on it but it should turn very easy in your hand without drag. You can also spin it and then have someone push on the brake to see how much it takes to get the brakes to apply. There should be some free play to your pedal before it really locks the brakes down. You also could have the rear master holding some pressure if it to has picked up gunk and causing the valve in it to stick. Oh and another thing have you ever pushed the piston back into the caliper by hand or with a screw driver?

Have you ever rebuilt a caliper before??
 
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Last Edit: 2010/02/01 15:23 By hardone2get.
 
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#253836
DKLAZ (User)
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Re:Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
Haven't had it on a lift yet, but I can hear the rub.

I never have rebuilt a caliper, but I'm fairly handy, and game for just about anything. What should I look out for?

Ideas? Thanks HardOne

DKLAZ
 
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#253839
hardone2get (User)
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Re:Rear Brake Rotor ('02, 1600) 4 Years, 8 Months ago  
Ok if you can put the bike in the air do as I said and spin the wheel if it's hanging up you will feel it. If it's hanging up remove the caliper from the bike and spin your wheel again. You should feel a major difference. While you have the caliper off take a "C" clamp and slowly push the caliper piston all the way back into the caliper. Then put it back on the bike and slowly with light pumps, pump the caliper back to seat the pads against the rotor and then let off and spin your wheel again and see if the drag is gone. Sometimes the piston can get cocked in the caliper and that's all it takes to prevent the piston from moving properly. If you have problem with this email me at hardone2get@yahoo.com and I'll give you my phone number.
 
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