R80RT Brake question - BMW Luxury Touring Community
 
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post #1 of 6 Old Aug 11th, 2011, 10:42 pm Thread Starter
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Location: Blossvale, NY, USA
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Angry R80RT Brake question

Front brakes locked up, they will engage but not release. Changed flex lines and rebuilt cals. I am getting air bubbles back into res. when lever is pumped, there just does not seem to be a lot of fluid movement. I'm thinking piston on the hand grip is stuck, or not returning to rest position. Is there an easy way to free it up or does it need to be replaced? Or am I missing something else?

Toby in New York
1983 R80RT Red (sold)
'03 R1200CLC (T-boned and replaced with)
'04 R1200CL Sidestand problem, BMW traded me for
'05 K1200LT. Goldie, Priceless
Lusting after K1600 GTL
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post #2 of 6 Old Aug 12th, 2011, 9:00 am
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Re: R80RT Brake question

Quote:
Originally Posted by tobiwan
Front brakes locked up, they will engage but not release. Changed flex lines and rebuilt cals. I am getting air bubbles back into res. when lever is pumped, there just does not seem to be a lot of fluid movement. I'm thinking piston on the hand grip is stuck, or not returning to rest position. Is there an easy way to free it up or does it need to be replaced? Or am I missing something else?
Most of the time when the brake lock up on an airhead it is due to the return hole in the master cylinder being stopped up. There are two holes inside the recess area in the bottom of the master cylinder. One is easy to see the other is very small and sometimes hard to find especially if the brake fluid is old. Take a single wire from a wire brush and run it thru this small hole normally that will fix the problem. After that be sure to change your fluids annually.

Jim Davidson
2007 R1200RT
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post #3 of 6 Old Aug 12th, 2011, 4:25 pm Thread Starter
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Wink Re: R80RT Brake question

Thank you for responding. She has been somewhat neglected since the o3,04,and 05 purchases. Out of the elements but not ridden much. Does the piston slide or move at all during use? I see the easy to see hole but only about 1/3 of it is in view to the right side of the hole as you sit on the bike. Is the small hole more to the right or left?

Thanks again for the help.

Toby in New York
1983 R80RT Red (sold)
'03 R1200CLC (T-boned and replaced with)
'04 R1200CL Sidestand problem, BMW traded me for
'05 K1200LT. Goldie, Priceless
Lusting after K1600 GTL
tobiwan is offline  
 
post #4 of 6 Old Aug 15th, 2011, 9:02 am Thread Starter
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Talking Re: R80RT Brake question

located the hole. cleared same. problem solved.

thank you again.

Toby in New York
1983 R80RT Red (sold)
'03 R1200CLC (T-boned and replaced with)
'04 R1200CL Sidestand problem, BMW traded me for
'05 K1200LT. Goldie, Priceless
Lusting after K1600 GTL
tobiwan is offline  
post #5 of 6 Old Aug 15th, 2011, 11:39 am
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Re: R80RT Brake question

Quote:
Originally Posted by tobiwan
located the hole. cleared same. problem solved.

thank you again.
Glad that was all it was. That is a real common problem on neglected brake systems.

Jim Davidson
2007 R1200RT
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post #6 of 6 Old Aug 15th, 2011, 12:02 pm Thread Starter
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Wink Re: R80RT Brake question

And they were neglected. will pay better attention from now on

Toby in New York
1983 R80RT Red (sold)
'03 R1200CLC (T-boned and replaced with)
'04 R1200CL Sidestand problem, BMW traded me for
'05 K1200LT. Goldie, Priceless
Lusting after K1600 GTL
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