- May 16, 2024
- Riding Since
- 2024
Hi everyone, first time posting here, such a nice forum that has already helped me a lot with my CBR650F (2015) that I got 3 months ago.
It had 21k km when I bought it and now has over 25k ! I just did a big service on it with :
-engine oil + filter
-replaced air filter, put new spark plugs (iridium)
-coolant flush with a big big cleaning with vinegar and distilled water multiple times (there was quite a lot of rust)
-brake bleed
My chain is dead and I'll replace it soon, didn't do the valve clearance yet, the garage I bought it from told me it's unecessary until ~40k km but I'll probably still do it soon when changing my chain+ sprockets.
The bike works really fine, except for the front brake ! Ever since I had the bike, the front brake has been noisy, a squeal that only happens at very low speeds. The garage I bought it from told me to be gentle on the front brake because they had put new front pads were, so I just thought the noise was because the pads needed bedding. 4000km and the squeal is still there !
I've tried everything, cleaned everything, pistons, pads, caliper, retaining pins, anti rattle clips, I put copper grease, I tried with nothing, the noise kept coming back, the only time there was a slight relief was when I went to clean the bike and everything was wet, for 5-10km the noise was gone lmao.
Apart from the noise, I've also observed that there was a really big brake drag, I got a front wheel stand and the wheel doesn't even turn 1 revolution when trying to spin it, it moves like 10cm, literally like if I was applying brakes.
So I thought calipers were stuck, I've dissassembled the calipers completely, looked at the piston seals and they seemed in good condition (I might have been wrong). The pistons are also in good shape, only a very very slight pitting on one piston on the left caliper. When putting back the pistons, they slided in with no resistance, so I thought ok should be fine now !?
The only thing I haven't looked at is the front master cylinder, maybe it has debris in it.
The other thing I suspect are the brake hoses, the bike is almost 10 years old (2015) maybe the hoses have collapsed inside or are damaged ?
I guess my option now is to buy a seal kit for the front, test that, if it doesn't change anything look at the master cylinder, and I might also change the brake hoses and put braided steel ones, even after bleeding the brakes the lever feels a bit spongy not very firm (maybe some air bubbles are stuck in the master cylinder ?).
What do you guys thing, and for guys that have the CB/CBR650F with these shitty floating Nissin calipers, how many revolutions do you get on the front wheel and do you have issues with brake drag ?
Thanks 🙏
It had 21k km when I bought it and now has over 25k ! I just did a big service on it with :
-engine oil + filter
-replaced air filter, put new spark plugs (iridium)
-coolant flush with a big big cleaning with vinegar and distilled water multiple times (there was quite a lot of rust)
-brake bleed
My chain is dead and I'll replace it soon, didn't do the valve clearance yet, the garage I bought it from told me it's unecessary until ~40k km but I'll probably still do it soon when changing my chain+ sprockets.
The bike works really fine, except for the front brake ! Ever since I had the bike, the front brake has been noisy, a squeal that only happens at very low speeds. The garage I bought it from told me to be gentle on the front brake because they had put new front pads were, so I just thought the noise was because the pads needed bedding. 4000km and the squeal is still there !
I've tried everything, cleaned everything, pistons, pads, caliper, retaining pins, anti rattle clips, I put copper grease, I tried with nothing, the noise kept coming back, the only time there was a slight relief was when I went to clean the bike and everything was wet, for 5-10km the noise was gone lmao.
Apart from the noise, I've also observed that there was a really big brake drag, I got a front wheel stand and the wheel doesn't even turn 1 revolution when trying to spin it, it moves like 10cm, literally like if I was applying brakes.
So I thought calipers were stuck, I've dissassembled the calipers completely, looked at the piston seals and they seemed in good condition (I might have been wrong). The pistons are also in good shape, only a very very slight pitting on one piston on the left caliper. When putting back the pistons, they slided in with no resistance, so I thought ok should be fine now !?
The only thing I haven't looked at is the front master cylinder, maybe it has debris in it.
The other thing I suspect are the brake hoses, the bike is almost 10 years old (2015) maybe the hoses have collapsed inside or are damaged ?
I guess my option now is to buy a seal kit for the front, test that, if it doesn't change anything look at the master cylinder, and I might also change the brake hoses and put braided steel ones, even after bleeding the brakes the lever feels a bit spongy not very firm (maybe some air bubbles are stuck in the master cylinder ?).
What do you guys thing, and for guys that have the CB/CBR650F with these shitty floating Nissin calipers, how many revolutions do you get on the front wheel and do you have issues with brake drag ?
Thanks 🙏