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1983 R80 G/S Front Wheel

Gregory Popovich
(@gpopovichcastlerockwinery-com)
Estimable Member Expired Membership

I just got my wheels back being rebuilt and no matter what sequence I follow when I tighten the front wheel axle nut the wheel is very hard to turn the wheel by hand. I'm following the manual as far as lowering it off the center-stand and compressing the front suspension, etc? When I loosen axle nut the wheel turns freely - with slight brake rub - which was normal.  

 

Thanks Greg

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Topic starter Posted : 01/23/2021 13:57
David Elkow
(@4949)
Trusted Member Expired Membership

I was recently reading someone’s travel story, on a GS I believe, where they had a flat on the front. They removed the wheel and carried it somewhere for repair.  When they reinstalled the wheel, it wouldn’t turn - kinda like yours, it sounds. Turns out they had lost a “spacer” in the shuffle. I’m not familiar with your front axle/wheel assembly, but this story I had read came to mind. 

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Posted : 01/23/2021 14:42
Gregory Popovich
(@gpopovichcastlerockwinery-com)
Estimable Member Expired Membership

@4949 Thanks - I have both spacers installed the narrower one on the brake side as manual states.

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Topic starter Posted : 01/23/2021 15:35
Gregory Popovich
(@gpopovichcastlerockwinery-com)
Estimable Member Expired Membership

It's the brake caliper - I took it off and the wheel spins fine & when I put caliper back on and tighten it all the way the wheel locks up again?

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Topic starter Posted : 01/23/2021 16:45
Gregory Popovich
(@gpopovichcastlerockwinery-com)
Estimable Member Expired Membership

Got it. Bled the brakes and undid right hex screw bounced front end tighten it again and now seems go to go.

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Topic starter Posted : 01/23/2021 18:51
David Elkow
(@4949)
Trusted Member Expired Membership

Hmmm. I know nothing of your front end, but something has moved. Did the wheel work involve removing/reinstalling the disc? Could something have gone together wrong there?  Totally guessing. Someone familiar with your bike needs to jump in. 

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Posted : 01/23/2021 19:15
David Elkow
(@4949)
Trusted Member Expired Membership

Glad you got it!

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Posted : 01/23/2021 19:17
Gregory Popovich
(@gpopovichcastlerockwinery-com)
Estimable Member Expired Membership

@4949

 

You're right on. I guess the important thing is if you have your front wheel off on a disk brake bike make sure no one pulls the brake lever or all hell break loose.

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Topic starter Posted : 01/23/2021 19:19
Richard Whatley
(@wobbly)
Member Moderator

There is also another possibility. The OEM flexible brake hoses are KNOWN to collapse internally. This restricts the brake fluid flow within the hose. The master cylinder (being a pressure pump) can force the fluid past the restriction. However, when the hand pressure is let off the op lever, pressure relief holes inside the brake master cylinder should allow the pressurized fluid to escape back into the fluid reservoir. BUT, there is no "pumping" action occurring in the reverse direction. So the hose restriction ends up retaining (trapping) a small amount of fluid pressure on the caliper. 

It is NOT the caliper's fault. It's a material failure in the inner-most layer of the flexible brake hose(s). You cannot see it from the outside. The problem is caused by the caustic nature of the DOT3/DOT4 brake fluid attacking the "rubber" hose over years and years. The older your brake hoses, the more likely you are to experience this. This is not a BMW issue, this happens to ALL brands of brake systems. It's only that most other motorcycle brands are dead and gone after 30+ years !!

Check out this article RIGHT HERE.

Hope this helps.

[color=blue]Don't hide 'em, Ride 'em !!
#15150[/color]

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Posted : 01/24/2021 05:55
Gregory Popovich
(@gpopovichcastlerockwinery-com)
Estimable Member Expired Membership

Thanks, both my R80G/S & R100S have stainless steel brake lines. I'm pretty sure what happened is while the wheels were off for two weeks - even thou I put a wood shim in between the pads - my son pumped the front brake repeatedly and a few times the shim fell out. I don't exactly know what happens when this occurs - but they warn you in the manual about it. After bleeding the brakes - the lever feels better than ever - going to go take it for a spin to check it out.

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Topic starter Posted : 01/24/2021 13:45
Gregory Popovich
(@gpopovichcastlerockwinery-com)
Estimable Member Expired Membership

Here's a shot..........

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Topic starter Posted : 01/25/2021 10:48
Gregory Popovich
(@gpopovichcastlerockwinery-com)
Estimable Member Expired Membership

Another .........

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Topic starter Posted : 01/25/2021 10:50
David Elkow
(@4949)
Trusted Member Expired Membership

Really like that motorcycle!  It would have to be fun. 

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Posted : 01/28/2021 07:40
Gregory Popovich
(@gpopovichcastlerockwinery-com)
Estimable Member Expired Membership

It is a fun bike thanks - but I bet I've put less than 50 miles on - spend all my free time getting it it good working order - the past owner wasn't exactly on top of it.

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Topic starter Posted : 01/29/2021 17:40

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