LT Rear brake wear & Mileage drop - BMW Luxury Touring Community
 
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post #1 of 14 Old Jan 11th, 2009, 5:10 pm Thread Starter
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LT Rear brake wear & Mileage drop

Not sure if these two symptoms are related, but looking for suggestions. How would you explain this history:

First set of rear brake pads lasted 24k miles. MPG was averaging 43.

Replaced rear rotor with new style (per service bulletin) because of brake squeal at 24k. Not sure if they replaced the pads as part of this job, but I put new rear pads on about 3k later. MPG in the upper 30s.

Replaced rear pads at 33K (6k later). Mileage continuing to drop.

Replaced rear pads at 36k service. Also switched to synthetic oil. MPG now in the low 30s.

I hear a little brake rub if I spin the rear wheel, but not sure if this is normal on an LT. Is there any history of reduced pad life with the new style rotor, or has BMW changed the compound on their pads?

Thanks for any ideas, since I'll probably have to tell the dealer what to look for if I have any hope of them finding the problem.

Alan
Garden Grove, CA

'07 K1200LT Biaritz Blue (97k miles)
'08 K1200LT Biaritz Blue (76k miles and climbing)

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post #2 of 14 Old Jan 11th, 2009, 6:06 pm
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Re: LT Rear brake wear & Mileage drop

I would clean the calipers with a good brake cleaner, even to the point of taking the calipers off the rotor and spraying liberally. check your fluid level once it is all back together and top off if needed. Also mileage suffers in colder weather vs summer...
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post #3 of 14 Old Jan 12th, 2009, 6:07 am
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Re: LT Rear brake wear & Mileage drop

My theory...
because it don't squeal no more, you're riding faster and revving harder, and therefore braking harder, ie, getting much more enjoyment from the LT in "sport" mode...
You running out tyres quicker, too????

Chris
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post #4 of 14 Old Jan 12th, 2009, 9:06 am
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Re: LT Rear brake wear & Mileage drop

The only way I run in the low 30's is when I spend an entire tank in the twisties at 6-7,000 rpm. I would look at the O2 sensor as the cause of the low mileage. If your rear brake was dragging enough to cause that change in mileage it would be blue and you would smell it.


Now having said that I do not have an explanation for the low mileage on the brake pads. 3K is way to low.

John
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post #5 of 14 Old Jan 12th, 2009, 9:56 am
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Re: LT Rear brake wear & Mileage drop

3K is way to low for brake pads. My 05 is close to 50K with original pads, and a fair amount of pad left.

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post #6 of 14 Old Jan 12th, 2009, 10:05 am
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Re: LT Rear brake wear & Mileage drop

I agree that 3K on rear pads is very low. I get about 15K on my rear pulling a trailer, and just replaced the front for the first time at 51K . How does the rotor look? Any blueing or warping? The caliper pistons could be hanging up .

Stevie Shreeve
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post #7 of 14 Old Jan 12th, 2009, 10:24 am
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Re: LT Rear brake wear & Mileage drop

This may be way out there - but - several years ago I had the dreaded 'cow bell'. After a complaining to the dealer and getting him to work on it, he said the rotor was replaced under warranty. I did note that there was no more 'cow bell' sound during my ride home.

When I arrived home, I found I could not push my bike rearward. I mean - it was like the brakes were on. After a brief bit of investigating, I found that the dealer had in fact - not replaced the rear rotor - he had merely bent the retainer holding the pads in such a way that it held the rear pads tightly against the rotor thus eliminating the noise -but causing a bigger problem. The rotor was discolored, but not badly. I straighted the retainer back out so I could move my bike. Cow bell was back.

Had I not checked I would have eaten up a set of rear pads in a big hurry and severely ruined my MGG's.

So - check your rear brake pad retainer.

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post #8 of 14 Old Jan 15th, 2009, 1:28 am Thread Starter
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Re: LT Rear brake wear & Mileage drop

Thanks for the input. I think I'll run another 1000 miles or so, check the pads and see what kind of mileage I get. Then I'll go have a conversation with the dealer. I'll also check to see if the brake rubbing noise on the bikes at the dealer is noticably different than mine. Hopefully it will be a warranty issue, and if it's a really good day they'll credit me for two sets of pads I shouldn't have needed.

A few specific responses:

Clean the calipers - done that, although maybe a more thorough cleaning is worth a shot

Weather - wouldn't account for that big of a mileage difference even when I lived in Ohio, definitely not now in Southern California

Riding faster, reving higher, high RPM in the twisties - love the theory, wish that was the case! Way too many California freeway miles in my case. The tire wear hasn't changed.

O2 sensor - It's given me grief and been replaced before, although for different symptoms. Probably worth checking again.

Rotor wear - It's not blue, but it may be a little warped based on how the brake noise varies as it rotates. I think there is more wear on the rotor than I would expect for being replaced 12k ago, but not sure.

I'll let you know when I get it figured out.

Alan
Garden Grove, CA

'07 K1200LT Biaritz Blue (97k miles)
'08 K1200LT Biaritz Blue (76k miles and climbing)

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post #9 of 14 Old Jan 20th, 2009, 6:12 am
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Re: LT Rear brake wear

I hate it when a thread comes back to bite me.....

I had the new rear 5-point rotor put on just after my 40,000km service, late June 2008. My service reports indicates the rear pads were checked and ticked as OK at that time.
I've put about 6000km on since, and now out of warranty.
I did check the rear pads about 2-3 months ago, still seemed like they had reasonable wear left.

Had a strange feel from the bike last 2 days, like something was amiss.... but couldn't put my finger on it, despite looking the bike over.
Pulled in for petrol on way home tonight, and smelled a metallic burning smell... sure enough checked the rear rotor and there are score marks (more like a metal build-up) on the outer side only... the inner side of the rotor looks OK.

Guess I'll be begging for mercy from the local dealer early in the morning, .....again (not where it normally gets serviced)!

Hopefully they can machine the rotor and save it....

Chris
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post #10 of 14 Old Jan 20th, 2009, 12:35 pm
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Re: LT Rear brake wear & Mileage drop

I went through this a couple of years ago. I assume you don't misuse or ride the rear brake so the possibly warped rotor or caliper lead the list. Mine was a sticky caliper. I was wearing out rear pads so fast a member at the Yahoo site rudely suggested I didn't know how to ride. An early clue on mine was the smell of hot brakes after relatively gentle riding. Toward the end the rotor began to blue. Either a warped rotor or sticky caliper are going to affect wear. You may need to deal with both at this point, my rotor was damaged by the excessive heat the caliper caused.
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post #11 of 14 Old Jan 20th, 2009, 5:36 pm
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Re: LT Rear brake wear & Mileage drop

not looking good... waiting on confirmation from dealer whether they can save the rotor using a wire-wheel to remove the molten metal.... I may have to fork out for a new rotor... if they have any in stock.

Turns out my normal dealer didn't put new pads in when they installed the rotor 6 months/6,000km ago. False economy which is likely to cost me in the end.

Oh well, shit happens.


Chris
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post #12 of 14 Old Jan 22nd, 2009, 6:12 am
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Re: LT Rear brake wear

update... service guys managed to save the rotor, cleaned up the metal buildup with a wire wheel and a sander and thought it was good enough job to keep it running. Will have to keep a closer eye on the wear of the new pads though. Repairs, new pads f&r, and a new rear tyre Au$823.
ouch.


Chris
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post #13 of 14 Old Jan 22nd, 2009, 6:56 am
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Re: LT Rear brake wear & Mileage drop

Quote:
Originally Posted by cws
Turns out my normal dealer didn't put new pads in when they installed the rotor 6 months/6,000km ago.
A normal dealer would not reinstall used pads on a new rotor; similar to reinstalling used bearing on a new crankshaft. I'd find a new dealer.

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post #14 of 14 Old Nov 8th, 2009, 12:15 pm
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Re: LT Rear brake wear & Mileage drop

I haven't posted in a long while but just had the dreaded "rear end failure". Mine started with a rear brake problem and escalated in the REF. I had a bad rear rotor replaced at 86000mi. by my pinnacle warranty, finally good for something. New pads also, no more cowbell or squeal from the rear brake either. Drove 2000 miles no problems then my neighbor knocks the bike over backing out of her driveway and it isn't picked up for three hours when someone finally tells me what happened. Was in the side yard laying on right side knocked from left off kickstand side. Took two strong men to pick it up out of the dirt. Busted mirrors, scratched panels other cosmetic damage but nothing but mirrors outright broken.

Went to dealer and got a 3000.00 estimate for damages. They said that it being on it's side for such a long spell shouldn't hurt anything. Well, rode another 2000 miles as I was waiting to get money from insurance to fix it and took it to Daytona for Biketoberfest. All went well for 600 miles of riding. Day after I got back had to drive back up to Orlando to catch a flight to Idaho to visit family. The bike stayed in a garage with friends till I got back. Once back home from Idaho, one week ago now, I drove it back to Ft Myers and while on a stop in Sarasota at a friends I noticed the brake was making a dragging noise, burned finger and decided to let cool while I visited. I got to thinking maybe someting wasn't right with the new rotor and once cool went and ran my fingers around it and snagged one on something sharp. I thought it was occullions possibily in the casting and one had warpped up and bite me. Called the shop 100 miles away yet and told them I was coming to have it checked and they said they would try and get to me but... so last second I changed my mind and just went home to unload all my stuff first, by then there was no time left to get to the shop and it cool so... called and said I'de be in Tuesday when they opened again. I also noticed fluid on my wheel presumably from the brake thought. Now my centerstand works intermittantly, been replace twice, and so I couldn't get it up there to spin the wheel around. It takes 2 people to get it on the centerstand without it working, didn't have an extra man.
Looked like the pad on the inside was thinner. and was touching maybe. Monday nite I drove over to Ft. Myers to my gal friend to show her trip pics and borrow my laptop.
Around 11:30pm decided to drive home but I had felt a funny feeling in the rear end when I had turned into her street. Her son was there so I had him help me put it on the centerstand and have a look see with a flashlite. It was touching on one spot on the rotor confirming in the dark to me it was the rotor and the occlusions in the casting I felt, the wheel had no side play or up and down as in a REF. So I took off for home and the thing started making a heck of a racket. I turned around went back and stayed the nite. I figured maybe a dreaded rear end failure was on the horizon. I made it the 4 miles to the shop next morning with the darn thing making the most horrible sounds you can imagine. Told them what I thought and proceded to hang around until they could have a coursery look see and confirm my suspicions. Well Once on the lift and rear wheel removed you could see the bearing retainer had forced its way to the left moving against the inner pad and smoking most of it. A slight touch and it all fell out to reveal a really messed up final drive bearing. I have photos but can't remember how to post them here. I will say she got me to the shop and as my ONLY transportation it's been hell without her this past week. Tuesday this week they will delve into it but....and always a but they said maybe the vent in the final drive got plugged when it was knocked over and sat there as long as it did. Any of you have any thought on that? I don't know where the vent is located, Anyone?
So... in answer to your question, look at where the rear wheel bearing is and see if it isn't backing out. My mileage didn't suffer. Down from 44 to 43 but I was going a lot faster and had a tailwind. Does the bike try to die and not Idle right? Had the Idle speed sensor replaced at 85000 mile Current failure at 91236mi. 2005 bike. Hope this helps.

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