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post #1 of 13 Old Sep 16th, 2008, 5:53 pm Thread Starter
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That's hot

Look at the pretty colors!
At CCR in Utah some guys (OK Bones and John) were riding behind me and said my brake light was flashing and staying on when I shouldn't have been on the brakes.
Now if it was someone else's bike I would say the idiot had his foot resting on the brake pedal
When I got home I washed the bike and haven't had a chance to ride it since. The other day I happened to look at the rear disk for some reason and
I have a 6k service overdue (but I did change the oil myself before CCR), so it is going in next week. I looked for a switch that operates the rear brake light, but do not see one near the lever mechanism. I am assuming that it is a pressure switch somewhere in the linked braking system hydraulics. There is probably something with that as well that is causing slight pressure to build up in the lines, but I haven't seen a schematic of how those things work.
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-Brian Louw
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post #2 of 13 Old Sep 16th, 2008, 11:00 pm
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Re: That's hot

Have you checked to make sure that there is some free-play in the brake pedal? It could be adjusted tight enough to maintain some pressure on the pads.

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post #3 of 13 Old Sep 17th, 2008, 9:58 am Thread Starter
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Re: That's hot

Quote:
Originally Posted by cccpastorjack
Have you checked to make sure that there is some free-play in the brake pedal? It could be adjusted tight enough to maintain some pressure on the pads.
Sure, Jack, that was the first thing I checked. The service manager at the dealer checked it as well.

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post #4 of 13 Old Sep 17th, 2008, 10:08 am
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Re: That's hot

hmm.. I wonder if there is too much air pressure in the master reservoir.. that might keep pressure on the brake hyd circuit.

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post #5 of 13 Old Sep 17th, 2008, 11:19 am
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Re: That's hot

Wow Brian, that looks like it got really hot. I wonder if it was like that the whole trip?

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post #6 of 13 Old Sep 17th, 2008, 10:32 pm
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Re: That's hot

Quote:
Originally Posted by blouw
Sure, Jack, that was the first thing I checked. The service manager at the dealer checked it as well.

Did the service manager also show you where the switch for the brake light is? I'm gonna dig into my GT on Friday to install a couple of things, and I'll give that rear brake a look.

you would think it could be a piston sticking, but with the light flashing on and off, it should like there may be pressure being applied through the line somehow.

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post #7 of 13 Old Sep 17th, 2008, 11:51 pm
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Re: That's hot

Another WAG - I had a car with air in the brake lines. The brakes would start to actuate over high altitude mountain passes and be fine as soon as we descended. Apparently the bubbles grow larger as you gain altitude and it built some gentle pressure in the lines to cause a slight brake drag. Don't really know the details. It was a rental and the company wanted to bill me until their mechanic told them what he thought the cause of the wear was. Anyway, hope this is of some use.

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post #8 of 13 Old Sep 18th, 2008, 7:02 pm Thread Starter
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Re: That's hot

Quote:
Originally Posted by Yiet
Another WAG - I had a car with air in the brake lines. The brakes would start to actuate over high altitude mountain passes and be fine as soon as we descended. Apparently the bubbles grow larger as you gain altitude and it built some gentle pressure in the lines to cause a slight brake drag. Don't really know the details. It was a rental and the company wanted to bill me until their mechanic told them what he thought the cause of the wear was. Anyway, hope this is of some use.
I like that theory. We were pretty high at Mirror Lake in Utah and then I came back over Tioga Pass on the way home. Also the guys riding behind said that the brake light did stop flashing when we got lower down, but I didn't tie the two together.

Thanks.

-Brian Louw
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post #9 of 13 Old Nov 12th, 2008, 7:11 pm Thread Starter
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Re: That's hot

Well I finally had the rear rotor and pads replaced under warranty, but the cause of the overheating was inconclusive. They bled the brakes and I have a suspicion it has something to do with air in the linked cicrcuit. It must be a closed circuit I would think, else you would be pushing fluid out the rear reservoir when using only the front brake. Of course there were no faults thrown in the computer.

Just thought I'd update you guys, but I hate not finding something definite. I'll be going on a ride up the Sierras this coming weekend, so that should be a good test. Nothing as high as we were in Utah when it happened - getting too cool out here in CA for the mountains.

BTW, the dealer gave me a R1200GS to go play on while I was waiting. Very impressive and quick handling, but I still prefer the GT.

Ride safe

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post #10 of 13 Old Nov 13th, 2008, 8:45 am
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Re: That's hot

Quote:
Originally Posted by blouw
I'll be going on a ride up the Sierras this coming weekend, so that should be a good test. Nothing as high as we were in Utah when it happened - getting too cool out here in CA for the mountains.
Howdy Brian. Is anybody going with you? Make sure they follow you and see if your brake light is on again.

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post #11 of 13 Old Nov 13th, 2008, 5:21 pm Thread Starter
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Re: That's hot

Hi Bones,
It is a group ride with CVBMR (Central Valley BMW Riders) club, so I will have plenty of company. Some of the guys from Fresno BMW, including the owner, usually go on these rides. Fresno BMW is a great dealer and look after you although they are not cheap, but then what is? This one is basically an RTE. Leave from Fresno and head up 41 to 49. From there we ride to lunch at Black Oak Casino near Tuolomne.

Bones, you are welcome to join us because you remember the symptoms from CCR I carry my infra-red thermometer with me and check the brakes at stops.

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post #12 of 13 Old Nov 13th, 2008, 8:12 pm
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Re: That's hot

Quote:
Originally Posted by blouw
Hi Bones,
It is a group ride with CVBMR (Central Valley BMW Riders) club, so I will have plenty of company. Some of the guys from Fresno BMW, including the owner, usually go on these rides. Fresno BMW is a great dealer and look after you although they are not cheap, but then what is? This one is basically an RTE. Leave from Fresno and head up 41 to 49. From there we ride to lunch at Black Oak Casino near Tuolomne.

Bones, you are welcome to join us because you remember the symptoms from CCR I carry my infra-red thermometer with me and check the brakes at stops.
We could smell the hot brake pads, too, so that's why the disc was discolored. When you have air in the lines, the handle feels mushy because the air compresses, so that doesn't sound right. I hope it got straightened out for you. You never know when you might have to follow and RV down a mountain!

Blessings!
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post #13 of 13 Old Nov 14th, 2008, 9:48 am
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Re: That's hot

Quote:
Originally Posted by blouw

Bones, you are welcome to join us because you remember the symptoms from CCR I carry my infra-red thermometer with me and check the brakes at stops.
Wow, I would LOVE to..but...It's kinda out of the way for a day ride. O'h well. I hope it's fixed for ya.

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