BMW K bikes (Bricks)

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1Back to top Go down   front brake issue... Empty front brake issue... on Wed Nov 08, 2017 12:51 pm

sarcastic pig

sarcastic pig
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I have a trike with an early k100 (i think) front end, front brakes are the early single pot callipers n they need a damn good seeing to...
Question i have is will the later twin pot callipers fit directly as a replacement as the extra umph in braking would be better for the trike...

Any help is appreciated thanks...

    

2Back to top Go down   front brake issue... Empty Re: front brake issue... on Wed Nov 08, 2017 1:17 pm

BobT

BobT
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Nope. The twin pots are for the floating disks. Fix what you have and you will find that they work well or buy the whole front end including forks wheel and brakes from a later 16 valve bike and you will get better brakes.

    

3Back to top Go down   front brake issue... Empty Re: front brake issue... on Wed Nov 08, 2017 3:41 pm

Dai

Dai
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As Bob says. There's a difference in offset by about 3mm (I think).


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

4Back to top Go down   front brake issue... Empty Re: front brake issue... on Wed Nov 08, 2017 4:00 pm

92KK 84WW Olaf

92KK 84WW Olaf
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I never had a complaint with those front brakes once they were in good order. Did a fluid change after only 6 months and amazed the effect even that has..so now they get new fluid regularly. I have a K1100LT to compare it with and not sure the hassle and cost of a complete front end change would be worth it although plenty have done it.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 102,50 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell No 34,600 miles
    

5Back to top Go down   front brake issue... Empty Re: front brake issue... on Wed Nov 08, 2017 4:10 pm

sarcastic pig

sarcastic pig
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Thanks for the replies, i was afraid of that tbh, the trike is a vw so has a fair amount of extra weight to stop...
I'm looking for a seal kit for the front callipers without goin to BMW themselves coz like HOW MUCH!!!

So if anyone can suggest a place in the UK that would be helpful...

Only other option I have atm, coz this thing is a money pit, is I have extended forks from a 97 daytona on my chop, might just scrap it n use it as a donor...

    

6Back to top Go down   front brake issue... Empty Re: front brake issue... on Wed Nov 08, 2017 5:02 pm

charlie99

charlie99
VIP
VIP
I wonder if a later 4 pot style master cylinder  at 16 mm  would be a better choice  to give more braking power to the front disks  than the standard 13 mm master cylinder
obvious to me is that a wide tyre would be needed also..


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%Ofront brake issue... 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   front brake issue... Empty Re: front brake issue... on Wed Nov 08, 2017 6:09 pm

BobT

BobT
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Nothing wrong with the standard brakes when they are working properly. You could throw money at it and change things, but you might as well just buy a different bike.

    

8Back to top Go down   front brake issue... Empty Re: front brake issue... on Thu Nov 09, 2017 2:31 am

sarcastic pig

sarcastic pig
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Ok I'm not sure people are even reading the pist now before answering...
I can't change the master cylinder as the front brakes now operate with the back from a foot pedal...
I am throwing miney at it but can't get a different bike as the thing is actually a trike...

The left callipers is leaking so i need to at least need to find a place in the UK that sell the seal kit...

Not meaning to cause offence with this next bit but please read all the post before putting in uninformed irrelevant replies...

    

9Back to top Go down   front brake issue... Empty Re: front brake issue... on Thu Nov 09, 2017 6:09 am

92KK 84WW Olaf

92KK 84WW Olaf
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@sarcastic pig wrote:Ok I'm not sure people are even reading the pist now before answering...
I can't change the master cylinder as the front brakes now operate with the back from a foot pedal...
I am throwing miney at it but can't get a different bike as the thing is actually a trike...

The left callipers is leaking so i need to at least need to find a place in the UK that sell the seal kit...

Not meaning to cause offence with this next bit but please read all the post before putting in uninformed irrelevant replies...

Well I read the post and you mentioned the front brakes. The standard set up is the 13mm front master cylinder for the front brakes. Obviously something has been changed as the footbrake does not normally operate the front brake on any of the Ks. That would be 'linked' brakes and Ks don't have that set up. I don't see that mentioned in your post but then my mental telepathic skills tend to be clouded early in the morning. Some might say all the time.

As regards the brake caliper [and master cylinder] parts I think most of us do actually use the BMW parts BUT the single pot calipers are Brembo and the exact same calipers are also found on the BMW R bikes and Moto Guzzi as well. I have done the brakes on both the K100LT [ABS] and the K100RT [non ABS] and all the parts were BMW. Calipers got new seals, pistons, master cylinders got repair kits and new pistons all with huge improvement.

You did ask about getting an improvement on the original set up, changing calipers is an expensive option due to needing to change the front end which is why you were offered the alternative of a change in master cylinder.
Some have changed the master cylinder unit to do this.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 102,50 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell No 34,600 miles
    

10Back to top Go down   front brake issue... Empty Re: front brake issue... on Thu Nov 09, 2017 6:48 am

RicK G

RicK G
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You will be able to get the parts you need at Motobins https://www.motobins.co.uk/bmw-parts.php?model=K%20Series&bikeref=K100
I would advise you to also use stainless braided hoses as that will make a big improvement. If you need a rear M/C check out eBay and find a comparable, I found a Yamaha one new for $15AUD.


__________________________________________________
"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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

11Back to top Go down   front brake issue... Empty Re: front brake issue... on Thu Nov 09, 2017 9:21 am

Gauntlett

Gauntlett
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Hi, my trike has standard callipers, discs and forks 84 rs , as you can see its front engined and has a lot of weight on the front end, it has a 13r 165/55 front tyre and I think a 3/4 inch piston in a single girling master cylinder operating both front and rear (drum) brakes, its relatively easy to lock up the front if you try hard, its not servo assisted, hope this info helps you.



Last edited by Gauntlett on Thu Nov 09, 2017 9:24 am; edited 1 time in total (Reason for editing : spelling)

    

12Back to top Go down   front brake issue... Empty Re: front brake issue... on Thu Nov 09, 2017 11:00 am

BobT

BobT
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@sarcastic pig wrote:Ok I'm not sure people are even reading the pist now before answering...
I can't change the master cylinder as the front brakes now operate with the back from a foot pedal...
I am throwing miney at it but can't get a different bike as the thing is actually a trike...

The left callipers is leaking so i need to at least need to find a place in the UK that sell the seal kit...

Not meaning to cause offence with this next bit but please read all the post before putting in uninformed irrelevant replies...
People are reading, but the post does not say that you are using a foot pedal instead of a brake lever as standard. 
As said the brakes work fine in standard form, but who would guess that you are using this foot pedal and who can guess what sized piston it has in it.
BMW will sell you a seal kit if you want to throw money at it. I might even have a new spare seal kit in my garage, but I can't be bothered to go and look.

    

13Back to top Go down   front brake issue... Empty Re: front brake issue... on Thu Nov 09, 2017 6:44 pm

Dai

Dai
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Life time member
Do NOT ask me why ('coz I've no idea  Very Happy ), but a new P8 seal kit for the front brake is cheaper from Gutsibits than Motorworks. Usually anything that says 'Moto Guzzi' gains a instant increase in price even greater than anything that says 'BMW'.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

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