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post #1 of 21 (permalink) Old 02-17-2017, 09:48 AM Thread Starter
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Location: Grenoble - France
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GL 1500 : second hand front brake disc

Hi everybody,

I have a 1996 GL 1500. My left side front brake disc (the one which operates with the rear brake disc) is approaching its wear limit.

I found on the net, here in France, an original Honda front brake disc which seems to be in state close to new (no sign of wear) and at a good price.

The only problem is that it is a right side front brake disc.

Comparing my two front brake disc, I see absolutely no differences between them two.

So do you think there could any problem mounting a right side front brake disc on the opposite side ?

Moreover, it seems to me that aftermarket front brake discs (for the GL 1500 or other bikes) are sold with no consideration for their side.

Thanks a lot in advance for your advices.

Good day to you all.

Guillaume
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post #2 of 21 (permalink) Old 02-17-2017, 10:58 AM
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According to partzilla parts catalog, left and right disks have different part numbers such as
45251-MT8-000 DISK, R. FR. BRAKE
45351-MT8-000 DISK, L. FR. BRAKE.

And they are only interchangeable between 1990-2000 models. You may want to check the model year of the part.

Since they have different part numbers there may be some differences, I don't know.
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post #3 of 21 (permalink) Old 02-17-2017, 11:15 AM Thread Starter
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Thank you for you answer Erdeniz.

The seller says his disc is for GL 1500 from 1990 to 2000, so it should fit my 1996 GL.

I am going to think about and see if any other member of the forum has an advice on this issue.
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post #4 of 21 (permalink) Old 02-17-2017, 12:27 PM
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get a new set of EBC rotors and know it will stop!

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post #5 of 21 (permalink) Old 02-17-2017, 01:15 PM
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Originally Posted by AlpineGoldwing View Post
Thank you for you answer Erdeniz.

The seller says his disc is for GL 1500 from 1990 to 2000, so it should fit my 1996 GL.

I am going to think about and see if any other member of the forum has an advice on this issue.
I've got a pair of brand new OEM discs in my garage still in their original bags and box and the Honda part numbers are as stated by Erdinez above. I've just had a good look at them and can see no differences between them other than the left-hand one has an 'L' printed into it. I wondered whether there would be a directional arrow but there isn't. Both say the minimum thickness should be 5mm so it doesn't seem to be anything to do with that either.

Honda also list two different part numbers for front brake pads 06455-MT8-405 (for the left) and 06435-MT8-305 (for the right) with only one side having a shim. This makes me think there must be some design differences between the two sides but for the life of me I can't see it.
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GL1500SE \'98 and Harley Fatboy 2004
Previously:
Triumph Rocket Touring 2010
Honda Valkyrie 2002 (fantastic!)
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post #6 of 21 (permalink) Old 02-17-2017, 06:03 PM
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To the best of my knowledge , the difference in the rotor is the sweep of the vent holes drilled in the rotor. Personally I do not believe it would make a difference , but I am no Honda Engineer
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post #7 of 21 (permalink) Old 02-17-2017, 09:43 PM
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Besides the sweep holes, I'd wonder if one might be slightly thicker from the mounting surface to the rotor itself.

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post #8 of 21 (permalink) Old 02-18-2017, 01:11 PM
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My first thought was the direction of the sweep holes, but it would not seem to matter which way they angled as they are not continuous grooves or something that direct water/debris away with wheel rotation.

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post #9 of 21 (permalink) Old 02-18-2017, 01:36 PM
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The purpose of slots on the sides of brake rotors is: to provide an escape path for expanding pad gasses being generated by the braking torque.

In EXTREME situations the outgassing from HOT-HOT pads can physically push the pads off the rotor- despite having your foot or hand buried!

Not a situation encountered in sane street riding, mountain fun maybe, Maaaayyyyybe
On the track, yep

Getting Your Groove On: 2 schools of thought- forward or backwards in relation to direction of travel ~,
Or is that mostly for show- as its not about cooling or dissipating heat- its an escape path

Note: A rotor clearly marked LEFT shouldn't need a directional arrow as well
Just because you all drive on the wrong side of the road over there.........

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post #10 of 21 (permalink) Old 02-19-2017, 04:34 AM
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Originally Posted by Aloha Tom View Post
The purpose of slots on the sides of brake rotors is: to provide an escape path for expanding pad gasses being generated by the braking torque.

In EXTREME situations the outgassing from HOT-HOT pads can physically push the pads off the rotor- despite having your foot or hand buried!

Not a situation encountered in sane street riding, mountain fun maybe, Maaaayyyyybe
On the track, yep

Getting Your Groove On: 2 schools of thought- forward or backwards in relation to direction of travel ~,
Or is that mostly for show- as its not about cooling or dissipating heat- its an escape path

Note: A rotor clearly marked LEFT shouldn't need a directional arrow as well
Just because you all drive on the wrong side of the road over there.........
I've just had another look at my new rotors and laid one on top of the other in the same position they would be on the bike i.e. outside edges facing out. The vent holes exactly match each other, which presumably is intentional to get their direction right, and the holes don't look like they have been drilled through at any angle. There are no vent grooves cut into the rotors. The thickness of each rotor is identical and the mounting holes exactly line up. The service and runout specification is stated as being the same for each side so they do look identical.

Maybe Honda marked one as "left" and had a different part number just for assembly line packaging purposes or maybe just for research purposes on which side sold more replacements if they wore out faster (because of the linked brakes influence). It is though for each person to make their own decision on whether to use them on opposite sides.

And Aloha Tom...you are exactly right, we do need directional arrows here as we do get confused between left and right. You drive on the right which we think is wrong and we drive on the left which we think is right!

GL1500SE \'98 and Harley Fatboy 2004
Previously:
Triumph Rocket Touring 2010
Honda Valkyrie 2002 (fantastic!)
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