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Rear brake drag
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NightRider Offline
Running Like a Top

Tennessee
Posts: 392
Joined: Aug 2014
Post: #1
Rear brake drag
When I turn my rear wheel by hand I have to grip the tire and turn with some effort and there is a slight sound of both pads in contact with the disk. How do I know the drag is ok or what too much drag is outside of knowing there is something wrong should it be very hard to turn the wheel?

Or, can a few of you try it with your bikes and let me know if it spins very easy or if there is some slight drag?

Thanks.

2014 CB1100 Black Edition - FOUR EVER
(This post was last modified: 02-09-2016 08:17 PM by NightRider.)
02-09-2016 08:16 PM
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kmoney Offline
High Mileage

Vancouver, BC
Posts: 908
Joined: Sep 2014
Post: #2
RE: Rear brake drag
Pretty much all disk brakes will have drag, as there is nothing but a deliberate (very small) warp in the rotor to actually push the piston/pad back to the released position. Your front will have drag as well if you manage to check it with the front wheel off the ground.

I don't have an actual torque spec for drag, but it should be minimal -- like a little flick spin should make it spin for about a foot. If you push it and it stops immediately, that's too tight. The back wheel will be tighter, as you're moving the chain, front sprocket, and essentially half the gearbox as well.
(This post was last modified: 02-09-2016 08:53 PM by kmoney.)
02-09-2016 08:51 PM
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NightRider Offline
Running Like a Top

Tennessee
Posts: 392
Joined: Aug 2014
Post: #3
RE: Rear brake drag
Thanks for the quick reply. I can flick it and it will move about a foot. I'll keep checking it from time to time. Since I have your attention, may I ask another related question. Do your rear pads have wear indicators, like a slot in the center of them that is visible should the pads still be ok?

Thanks again. - Art

2014 CB1100 Black Edition - FOUR EVER
02-09-2016 08:58 PM
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kmoney Offline
High Mileage

Vancouver, BC
Posts: 908
Joined: Sep 2014
Post: #4
RE: Rear brake drag
I've honestly never looked at my rear pads, but there are a couple people on here who have done several pad changes.

I've never seen a motorcycle pad with a "squeeler" so it's probably going to be either a slot or just visual inspection (the shop manual should state minimum pad thickeness).
02-09-2016 09:25 PM
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NightRider Offline
Running Like a Top

Tennessee
Posts: 392
Joined: Aug 2014
Post: #5
RE: Rear brake drag
Thanks again.- Art

2014 CB1100 Black Edition - FOUR EVER
02-09-2016 09:28 PM
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Pterodactyl Offline
Road Warrior

Sydney, Australia
Posts: 2,740
Joined: Sep 2013
Post: #6
RE: Rear brake drag
(02-09-2016 08:58 PM)NightRider Wrote:  Thanks for the quick reply. I can flick it and it will move about a foot. I'll keep checking it from time to time. Since I have your attention, may I ask another related question. Do your rear pads have wear indicators, like a slot in the center of them that is visible should the pads still be ok?

Thanks again. - Art

Art, wear indicators are brand dependant. The pads my bike came fitted with had wear indicators, the two sets I've fitted since don't. I change the pads when thickness is approaching 2mm.

Cheers

(02-09-2016 09:25 PM)kmoney Wrote:  .........(the shop manual should state minimum pad thickeness).

I read Kmoney's thread and thought to myself, "Why do I change the pads when thickness approaches 2 mm?" I dunno, just do. So I checked my '13 model workshop manual and could not find a reference to minimum pad thickness. Just, "Replace the brake pads if either pad is worn to the wear indicator". I guees that 2mm seems to me to be about time for a change.

Cheers

Don't ride safe. It's boring.
(This post was last modified: 02-10-2016 01:09 AM by Pterodactyl.)
02-10-2016 12:58 AM
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The ferret Online
Forum Moderator

Ohio
Posts: 31,278
Joined: Apr 2013
Post: #7
RE: Rear brake drag
Edited*** with updated info and pictures

On the CB it's really easy to see how much rear pad you have left

in this pic the gold color is the backing plate and the gray color with red arrow pointing to it, is the brake pad. (note how pad is lightly against brake rotor..this is normal). When new the brake pad is approx. 3/16" thick. When the brake pad gets within 1/16" or a little less of the backing plate it's time to replace (1/16" would be approx 1.5mm)

İmage

Here is a new CB1100 rear brake pad for my 14 dlx

İmage

İmage

Pad measures slightly less than 3/16" thick when new

İmage


Just replaced all the pads on my ST 1300 and I took them down a little far lol. Don't take yours down this far. Much further and I could have damaged my rotors. Knew they were due but kept putting it off. When I did get around to it, it was almost too late. I got lucky.

İmage

.
Defender of the Realm
2014 DLX (the pleasure horse)
2021 NC750X DCT (Angry Bird)
(This post was last modified: 02-10-2016 06:46 AM by The ferret.)
02-10-2016 04:45 AM
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Elipten Offline
Road Warrior

San Antonio, TX
Posts: 2,087
Joined: Nov 2013
Post: #8
Rear brake drag
Yikes that was close!


2014 CB1100 DLX
2013 CB1100 Std
1990 BMW K75 RT

Current inventory

2014 CB1100 DLX
1990 BMW K75RT
02-10-2016 05:59 AM
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Toddman Offline
1st Service Completed

Norman, OK
Posts: 165
Joined: Apr 2015
Post: #9
RE: Rear brake drag
A lot of that drag is the chain and sprockets. Take the chain off and see how it spins.

-------------------------------
2014 CB1100
2006 GSXR1000 Track Bike
02-10-2016 06:36 AM
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The ferret Online
Forum Moderator

Ohio
Posts: 31,278
Joined: Apr 2013
Post: #10
RE: Rear brake drag
BTW here is a set of front pads for my 14 dlx

İmage

Notice the slots in the pads. This is your normal wear indicator. When it gets to the bottom of the slot, it's time to replace

İmage

These measure slightly less than 3/16" thick when new, and the slot clearly shows that when it gets down to 1/16" it's time to replace

İmage

*Note I really thought the front and rear pads were thicker than this. It was a revelation to me to actually measure this new set of pads. These pads must really be tough hauling down a 570 pound motorcycle and 200 pound rider for 20,000 miles before needing replacement.

.
Defender of the Realm
2014 DLX (the pleasure horse)
2021 NC750X DCT (Angry Bird)
(This post was last modified: 02-10-2016 06:54 AM by The ferret.)
02-10-2016 06:44 AM
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