BMW K bikes (Bricks)

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1Back to top Go down   2V K bike front brake MC ?'s Empty 2V K bike front brake MC ?'s Mon Oct 28, 2013 7:45 pm

Brad-Man

Brad-Man
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My '85 has non stock bars and controls on it including the Master Cylinder.

I have a pretty good grip and when working the brake lever I get very little movement before it can't move any more - thend of the lever may move ~1/2".

On stock bikes with brakes in good nick, how much does the end of the brake lever move until 'locked'?

I'm asking because the MC I have may be perfect for a swap to the later 4 piston calipers...

Thanks for the info.

Brad

    

2Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Mon Oct 28, 2013 8:46 pm

duck

duck
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The 2V bikes have a 13mm master cylinder and the 4V bikes have a 20mm master cylinder.

Usually the brakes on 2V bikes are somewhat anemic since the old brake lines are mush.

You can't just swap 4V calipers onto a 2V bike as they don't "bolt right up."


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

3Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Mon Oct 28, 2013 8:56 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
The 20mm master cylinder from a 16V gives the best 'feel' when using later, BMW-Brembo four-piston calipers, but as Duck says, they don't just bolt up (well, they do, but won't align with your standard 285mm discs). The 13mm M/C doesn't do well with the four-piston calipers; the feel goes away. The four-piston calipers do bolt onto the fork leg but at a quite disagreeable spacing over the discs. See the front of my bike for one 'solution': aluminium spacers 8mm thick which rest on the wheel hub and place the discs in the centre of the caliper. But then you don't have enough disc up inside the four-piston caliper clamping on the discs to make it worth it, hence, my answer: larger diametre, modified Suzuki 292mm discs.

Mate, unless you have the entire front end off a 16V model it ain't hardly worth the trouble. Even that can give you a headache, offset-wise.

A 13mm master cylinder, well-bled and with good hoses (I'm using HEL brand stainless steel) does a fine job with the two-piston Brembos which came with the bike.


__________________________________________________

1970 R60/5, OZ '77 R75/7-R100, '85 K100'87 K75C, OZ '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - Beemers owned still or sold.

~We all believe what we want to believe in - Rob Dickinson
    

4Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Mon Oct 28, 2013 9:11 pm

RicK G

RicK G
admin
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+1 on what Duck said . there is a way to get the 4 piston calipers onto a K100 front end. You need to also fit the 285mm discs from the BMW R100 mystik which is the very last of the airheads. you would be better off buying an after market set new as I have only ever seen one set of used discs for sale.
If you want to get good brakes just get a complete front from a K1100 RS or LT and put it on ,it is the easy way to do it and the brakes are a heap better than the smaller K100 discs.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

5Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Mon Oct 28, 2013 9:19 pm

duck

duck
Life time member
Life time member
You also get better forks if you swap in a whole front end.

You can't tell by looking at it (except for the OEM K75 exhaust) but this is my K75 with a K1100 front end.

2V K bike front brake MC ?'s K75f_810_hurricane_ridge


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

6Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Mon Oct 28, 2013 10:25 pm

charlie99

charlie99
VIP
VIP
+1 on the braided lines making the pull up  really good....verry little moovement required after the upgrade from old rubber lines to braided ones


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O2V K bike front brake MC ?'s Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

7Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Mon Oct 28, 2013 11:02 pm

duck

duck
Life time member
Life time member
This works pretty well.  

Braided stainless line direct from master to right caliper.

2V K bike front brake MC ?'s IMG_0504

You can't see it in the picture but then there's a "solid" metal line from the right caliper to the left caliper. BMW part 34322312691.

2V K bike front brake MC ?'s IMG_0507

And you can take some play out of the brake lever if you get the one that has the little set screw in it.

2V K bike front brake MC ?'s IMG_0511

Top it all off using sintered brake pads.

2V K bike front brake MC ?'s FA18HH


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

8Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Tue Oct 29, 2013 11:36 pm

Brad-Man

Brad-Man
Life time member
Life time member
Thanks for all the info, and Duck - glad to see you back!

I'm sure I speak for everyone when I say that you have been missed.

I guess I should have stated that I have a 4v front end to put on, as well as everything but a rear shock for a 4v/K1100 Paralever rear, having just purchased 3 spoke wheels.

I DO have an aftermarket shock of unknown manufacture that if good may convice me to lower the mounting of the triples on the front forks...

I have SS brake lines.

The brake lever moves less than even my RD350's w/SS lines, and they have a 16mm MC for a single disk - 13mm is the perfect size for the  RD's w/stock brakes....

I'm thinking I have a MC that will work w/the 4 piston calipers because of the lack of lever travel, but was trying to gauge it by how much the stock setup w/SS lines travels....

Anyone care to provide a measurement?

Thanks,

Brad

    

9Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Wed Oct 30, 2013 10:59 am

AJ.Valente

AJ.Valente
Life time member
Life time member
@RicK G wrote:If you want to get good brakes just get a complete front from a K1100 RS or LT and put it on ,it is the easy way to do it and the brakes are a heap better than the smaller K100 discs.
Ya, I've been wondering bout that too since I plan to go to 3-spoke rims in near future. Seems everyone must be doing it given the dearth of front rims for sale these days.

Along the same lines, mine isn't a sport bike. So, what would be your opinion of a milder upgrade to a 3-spoke rim from a K75s and reuse the old brakes, only with braided lines? (Is my current plan)


__________________________________________________
'98 K1200RS Marrakesh Red

My old K100 RT Pics and Mods
    

10Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Wed Oct 30, 2013 2:03 pm

Brad-Man

Brad-Man
Life time member
Life time member
@AJ.Valente wrote:
Along the same lines, mine isn't a sport bike. So, what would be your opinion of a milder upgrade to a 3-spoke rim from a K75s and reuse the old brakes, only with braided lines? (Is my current plan)
I'd go for it - same size rims as you already have, as long as the rotors bolt on w/proper clearances....

I'd use the tires from your bike tho' - V rated for heat from heavier/faster vehicle.

    

11Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Wed Oct 30, 2013 3:20 pm

duck

duck
Life time member
Life time member
If you're switching to 3-spoke wheels then you can run radials. I run these and they are awesome.

BT-023 110/80ZR-18 front

Avon AV46 140/80ZR-17 rear


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

12Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Wed Oct 30, 2013 8:37 pm

RicK G

RicK G
admin
admin
I put the 3 spoke wheels from a K1100RS on my K1100LT and the difference from being able to get a good choice of radials is terrific, you wouldn't believe it's the same bike. I am currently using Michelin PR2s and so far 21,000kms with at least 4000 to go on the rear and probably only half gone on the front.
Buy why do just that go buy a K1100RS and have the lot in one go and still the nice K100 in stock trim.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

13Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Thu Oct 31, 2013 10:09 pm

Brad-Man

Brad-Man
Life time member
Life time member
So I guess no one out there has stock 2V brakes w/SS lines that can measure how far the end of their brake lever moves....

    

14Back to top Go down   2V K bike front brake MC ?'s Empty Re: 2V K bike front brake MC ?'s Thu Oct 31, 2013 11:13 pm

RicK G

RicK G
admin
admin
I fitted stainless lines to a K75S a while ago ans it did make a big improvement but as to how much less the lever moves I cant say because the lines were cactus when I started. But thinking back and comparing it to my wifes K75RT there was a small difference as to how much movement there was but it was much firmer.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

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