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K100-forum.com » Technical, repair and troubleshooting » Frame, fairing and wheels » Front master cylinder on long time stood bike

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Rik lancs

Rik lancs
active member
active member
Having just got a k100rs running after being stood in a dry British garage for 14 years   my next issue is the front brake 
The lever goes in with no pressure
Is it possible that a bleed might sort it out 
Or a master cylinder kit 
I have 4 days before I can work on it again and should I just order a kit or is it worth trying to bleed it first    the rear one seems to work
I dont suppose you guys were to start for the other problem the hazards keep flashing if I mess with the switch I can turn them off temporarily 
Iv sprayed the switch with wd 40 but no improvement

    

duck

duck
Life time member
Life time member
You should consider taking the piston out and getting it thoroughly cleaned out if mere bleeding doesn't work. That's what I'd try before spending money. You can also inspect the walls of the cylinder bore when you do that. If the bore wall is pitted then a rebuild kit won't help and you'll need to replace the whole thing.


__________________________________________________
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
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
    

jbt

jbt
Life time member
Life time member
Is it a 16v K100RS1?
If so, RIP the master cylinder. Don't bother buying a refurbish kit.

Chase a R1100 used one, as they are anodised and age better than the K4V ones, or buy a new one for 400€, until they're not available anymore.

Your next issue will be, for sure, the crankshaft main seal leaking on the clutch disc as soon as the engine runes again after sleeping for years. You have the choice: you change the seal or the seal plus the whole clutch if you wan't to try to ride as it is to see what happen...the difference is the price of a new master cylinder.


__________________________________________________
Let us enjoy the transient delight
That fills our fairest day.
    

Rik lancs

Rik lancs
active member
active member
Its 12v im sure well Iv been turning it over on a 12v car battery  just rs   i think

    

jbt

jbt
Life time member
Life time member
A K100RS 16V stands for 16 valves. Not 16 Volts. Laughing


__________________________________________________
Let us enjoy the transient delight
That fills our fairest day.
    

jbt

jbt
Life time member
Life time member
How are the front calipers? 2 pistons P08 or 4 pistons?


__________________________________________________
Let us enjoy the transient delight
That fills our fairest day.
    

92KK 84WW Olaf

avatar
Life time member
Life time member
Put the VIN and year etc in your signature so you get the correct answers.

My 83 RS sat in a shed for 17 years until 2018. I had to replace all the brake lines and master cylinders.

Also, 83 brake calipers are not the same as 84 brakes. You need the R bike kits and not the early K bike kits. Smaller caliper pistons.

A lot of other stuff too, entire fuel lines pump filters seals injectors vacuum pipes Z pipe etc


__________________________________________________
1992 K100LT 0193214 Bertha 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 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 49,200 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

Rik lancs

Rik lancs
active member
active member
Its 1992 and its a rs 
I just checked on a vin checker

    

duck

duck
Life time member
Life time member
Then it has 4 volts per cylinder. Laughing


__________________________________________________
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
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
    

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K100-forum.com » Technical, repair and troubleshooting » Frame, fairing and wheels » Front master cylinder on long time stood bike

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