BMW K bikes (Bricks)

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Matthew-Brisbane

Matthew-Brisbane
Life time member
Life time member
Hello All

For the cost and safety is it worth buying a new REAR BRAKE M/CYLINDER- from motobins or try repairing ??

    

charlie99

charlie99
VIP
VIP
worth a try to fix first Mathew

you've probably got nothing to loose in trying

just the seal-rubber on the main piston could be had it... is the only real reason for failure
we have seen that a few folks have done a repair after finding the blocked equalizer vent ...not apparent at first and certainly hard to find without good light and a really small angular probe ..something like a primus cleaner probe made out of really strong steel


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OREAR BRAKE M/CYLINDER-required buy new or repair ??? Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

RicK G

RicK G
VIP
VIP
There are several places around Brisbane that do stainless sleeves but they work out to about the same cost as a new MC from Motobins
Only really worth doing if you cant get a new or good used unit.
But DON"T go to Master Cylinder Exchange service at Wynnum they are not up to doing the small Motorcycle MCs but still attempt them. The definition of an idiot is someone who does the same thing over and over expecting a different result.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

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

Johnser

Johnser
Silver member
Silver member
you can buy just the MC pushrod inc. seals.

Strip it and if the inside surface is decent with no severe pits/scores, it should be grand with a new set of seals. Don't be afraid to clean up the inside with some very fine wet and dry (~2000).

I dont know if there is a place to buy just the seals... I couldn't find any.

re-using is not going to cause you spontaneously combust. if you mess it up, it'll leak and you'll fix it/buy a new one. Anyway, its only the back brake.

    

rawdonball

rawdonball
Platinum member
Platinum member
A mate put me onto "Red Rubber Grease" - A Castrol product. The worse the surface of the master cylinder bore, the more liberal the application of this Magic grease.


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'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

AJ.Valente

AJ.Valente
Life time member
Life time member
My rear master was badly corroded (at 65K miles), so I replaced it with new. If properly maintained with regular fluid changes it should keep much longer.


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'98 K1200RS Marrakesh Red

My old K100 RT Pics and Mods
    

gpguyer

gpguyer
active member
active member
FYI rear master cylinder overhaul kit from Munich motorcycles $130 I overhauled my front brake and it works a treat.


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REAR BRAKE M/CYLINDER-required buy new or repair ??? 23051310
    

Matthew-Brisbane

Matthew-Brisbane
Life time member
Life time member
Thanks to all that reply
Now I just need to find that extra day between sunday and monday to have a go a the repair

    

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