1 91 K100RS GSX-r master cylinder solution Sun Apr 24, 2022 1:53 pm
ninefourteener
active member
Greetings,
My bike is a 1991 (European spec) K100RS, and I did a full GSX-r front end swap, with the help of cognito moto.
I "assumed" that since the bike originally came with 4-pot brembos, that the GSX-r 4 pot Nissins would work just fine with the OEM BMW master cyl.
The front brake was spongy when I bought the bike, and the previous owner said it just needed to be bled. He could have been lying, because I had to drill out one of the screws on the reservoir, so he likely never took the cap off. I never even attempted to try to correct it, because I knew everything was coming off. I don't know if the MC is any good.
I just did the full install/bleed on the brakes.... no leaks whatsoever, but the brake handle is VERY spongy, and provides "a little" resistance, but only at the few mm from being fully compressed against the accelerator.
Nevertheless.... I have 2 questions:
1. Is the OEM MC on my bike sufficient?? And all I need is to rebuild the MC???
Or....
2. Do I need a completely aftermarket solution??
Thanks in advance!
My bike is a 1991 (European spec) K100RS, and I did a full GSX-r front end swap, with the help of cognito moto.
I "assumed" that since the bike originally came with 4-pot brembos, that the GSX-r 4 pot Nissins would work just fine with the OEM BMW master cyl.
The front brake was spongy when I bought the bike, and the previous owner said it just needed to be bled. He could have been lying, because I had to drill out one of the screws on the reservoir, so he likely never took the cap off. I never even attempted to try to correct it, because I knew everything was coming off. I don't know if the MC is any good.
I just did the full install/bleed on the brakes.... no leaks whatsoever, but the brake handle is VERY spongy, and provides "a little" resistance, but only at the few mm from being fully compressed against the accelerator.
Nevertheless.... I have 2 questions:
1. Is the OEM MC on my bike sufficient?? And all I need is to rebuild the MC???
Or....
2. Do I need a completely aftermarket solution??
Thanks in advance!
Last edited by ninefourteener on Mon Apr 25, 2022 3:14 am; edited 1 time in total