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Author Topic: Rear brake  (Read 1185 times)

erod1

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Rear brake
« on: May 06, 2013, 09:42:24 AM »
I recently replaced my rear brake shoes with ebc brand. I am having a problem where I cannot seem to adjust them to make the rear brake stop. The pedal goes all the way down. I have repositioned the rear brake lever that the rod goes thru. The other thing I noticed when I went in for a state inspection. The rear brake light was stuck on. If I lifted the brake pedal up the light would turn off. I remomved the rear tire to to view where the brake switch was at. I found the switch and pushed in the pin. It was vey hard. Could this be causing the brake pedal to be so low. I also replaced the springs when I changed the brakes.

My last question I recently replaced the fork seals and oil. The forks now are very stiff. Is that normal ?

Thank you in advance for any help.

Offline Bob_Roller

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Re: Rear brake
« Reply #1 on: May 06, 2013, 10:45:45 AM »
One of the most common reasons for a rear brake not to work after a brake shoe replacement, is you have the wrong shoes .

If you have an LS bike or a mono shock bike, you probably have the shoes for a bike with snowflake wheels .

There is a difference in diameter of the brake drum between the snowflake wheels and the 'composite' wheels .
« Last Edit: May 06, 2013, 10:58:54 AM by Bob_Roller »
'81 R65
'82 R65 LS
'84 R65 LS
'87 Moto Guzzi V65 Lario
'02 R1150R
Riding all year long since 1993 .
I'll give up my R65, when they pry my cold dead hands from the handlebars !!!!!

erod1

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Re: Rear brake
« Reply #2 on: May 06, 2013, 10:55:21 AM »
I have an 86 mono regular R65.

Offline Bob_Roller

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Re: Rear brake
« Reply #3 on: May 06, 2013, 12:14:21 PM »
Also, the rear brake springs are different lengths between the snowflake wheels and the 'composite' wheels .

The snowflake springs are shorter .

I found this out after fighting the springs, when I swapped rear wheels
from my '84 LS to the '81 R65 .

Got ahead of myself with the '84 and put new tires on it a few years ago, it has since turned into a parts bike for the time being, the '81 needed a new rear tire .
'81 R65
'82 R65 LS
'84 R65 LS
'87 Moto Guzzi V65 Lario
'02 R1150R
Riding all year long since 1993 .
I'll give up my R65, when they pry my cold dead hands from the handlebars !!!!!

erod1

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Re: Rear brake
« Reply #4 on: May 06, 2013, 12:50:28 PM »
The strange thing is that I got the brakes from a BMW dealer. I think I will put the old shoes and springs back on and see if they make a difference.

Offline Bob_Roller

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Re: Rear brake
« Reply #5 on: May 06, 2013, 01:03:29 PM »
Put the two sets of brake shoes next to each other, it should be evident if they are different .

Ordering the correct parts is only as good as the parts person doing the searching .

Most dealers are not knowledgeable about the airhead bikes .
« Last Edit: May 06, 2013, 01:05:29 PM by Bob_Roller »
'81 R65
'82 R65 LS
'84 R65 LS
'87 Moto Guzzi V65 Lario
'02 R1150R
Riding all year long since 1993 .
I'll give up my R65, when they pry my cold dead hands from the handlebars !!!!!

erod1

  • Guest
Re: Rear brake
« Reply #6 on: May 06, 2013, 02:10:05 PM »
Thanks.

Offline Luca

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Re: Rear brake
« Reply #7 on: May 06, 2013, 03:15:43 PM »
+1 on dealership ignorance.  My dealership not only gave me the wrong brake pads for my 82LS with ATE calipers, but also gave me the set of EBC shoes for the rear that fit a standard R65 (my drum is 220mm vs the standard 200mm).  Ended up getting a proper set of pads from Beemershop and OEM shoes from somebody closing out a dealership on eBay.

The parts department at my dealership couldn't do anything with the measurements I gave them from my factory manual...  and they wanted to give me store credit when I returned the improper shoes.  Also said I'd have to get BMW parts, as there were none in the aftermarket, but bmw2valve.com has them [smiley=angry.gif]

I seem to have better luck finding these parts with people who specialize in Airheads.  Beemershop, the new bmw2valve.com, motobins (helloooooo shipping!) etc.

As for the forks... changing to a heavier weight oil will make the forks stiffer.  However, there is no industry standard for fork oil weights, so if you want to experiment between heavier and lighter oils you should stick with the same brand.  Some people also use red automatic transmission fluid for fork oil.  It's certainly cheaper, and some Hondas actually called for ATF in the lube specs.  Not much to quantify your experimentation though when using that stuff.  My "feeling" is it's a bit on the light side of Belray 7.5wt.  You can also get the forks a little bit stiffer by using a little more oil, but don't use less than spec, and make sure the forks have an equal amount.

One other thing.  When you reinstalled the forks, did you put them in the triple trees and install the wheel before putting the springs and caps back in, making sure that everything moved smoothly?  One reason your forks could be stiffer is that they are no longer parallel to one another and bind as they compress.  This is often called "striction."

And before Monte shows up...      ;)
Quote
I have an 86 mono regular R65.
put that in your sig or your initial post and people can help you off the bat.
'82 R65LS
'01 K1200RS

Offline montmil

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Re: Rear brake
« Reply #8 on: May 06, 2013, 03:59:44 PM »
Dang good, Luca. You're rockin' the house! [smiley=beerchug.gif]
Monte Miller
Denton, TEXAS
1978 BMW R100S
1981 BMW R65
1983 BMW R65
1995 Triumph Trophy
1986 VW Cabriolet