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K100-forum.com » Technical, repair and troubleshooting » k1100rs no brake at high rpm

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1Back to top Go down   k1100rs no brake at high rpm Empty k1100rs no brake at high rpm Mon Nov 22, 2021 4:55 pm

Gergely

Gergely
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active member
Hi! I've just bought a k1100rs from 1992. 60k km. Noticed that in neutral gear, with bike stand still, brake power disappears (both with actuated front brake lever and rear brake pedal) at high engine RPM (above 3000 approx) and comes back below 3000 RPM.   No issue when bike has velocity.    Anybody has found same behaviour? Is it an ABS I. caused issue? Normal or not?
Thank you


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K75 1991
    

2Back to top Go down   k1100rs no brake at high rpm Empty Re: k1100rs no brake at high rpm Mon Nov 22, 2021 7:12 pm

Laitch

Laitch
Life time member
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Gergely wrote:Normal or not?
Not normal. The brakes should slow and stop the wheels regardless of the engine's speed or whether the transmission is in neutral, and regardless of ABS function.


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1995 K75 90,000 miles
    

3Back to top Go down   k1100rs no brake at high rpm Empty Re: k1100rs no brake at high rpm Mon Nov 22, 2021 7:23 pm

92KK 84WW Olaf

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Pull the ABS relay and take the bike for a ride.


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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 51,800 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
    

4Back to top Go down   k1100rs no brake at high rpm Empty Re: k1100rs no brake at high rpm Mon Nov 22, 2021 10:00 pm

Holister

Holister
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I'm at a loss as to how you can determine a decrease in braking power when the bike is in neutral and standing still. What's the symptom? Does the lever pull in at high rpm?

An increase in rpm will not affect the brakes or the function of the ABS.
However, strange things can happen. It's a known issue that the ABS does not like low voltage.
Get your battery checked. You should have close to 13v after a good charge and a rest for 12 hrs. And charge voltage should be around 14v @2,000rpm.

Another problem could be old brake fluid and/or air in the system.
Replace the brake fluid and bleed the ABS system correctly.


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808		 k1100rs no brake at high rpm Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

5Back to top Go down   k1100rs no brake at high rpm Empty Re: k1100rs no brake at high rpm Tue Nov 23, 2021 2:27 am

Gergely

Gergely
active member
active member
Holister wrote:I'm at a loss as to how you can determine a decrease in braking power when the bike is in neutral and standing still. What's the symptom? Does the lever pull in at high rpm?    
        Standing in the slight slope of the garage entrance to hear engine sound without helmet, bike starts to move downward over 3-4000rpm with brakes actuated  .     Lever stills in position but no effect.    Rpm falls, brakes again.

An increase in rpm will not affect the brakes or the function of the ABS.
However, strange things can happen. It's a known issue that the ABS does not like low voltage.
Get your battery checked. You should have close to 13v after a good charge and a rest for 12 hrs. And charge voltage should be around 14v @2,000rpm.

Another problem could be old brake fluid and/or air in the system.
Replace the brake fluid and bleed the ABS system correctly.

THANK YOU!
I will check battery and for air in system.   Fluid should have been renewed each year by previous owner.

    

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