braking issues

[GSQC]

Hey I've rode my bike yesterday and I have noticed some funny sensation when I pressed the front brake lever firmly like a heart beat pulse in the lever and the fork was compressing decompressing compressing each time a I braked hardly
Is the issue with the brake fluid or with the brakes themselves?

[7981GS]

Warped/under-sized rotors?

Daniel

[GSQC]

maybe I had some slight wobble during braking but the rotor size is correct

[spyug]

Welcome. Do you know when the brakes were last serviced? Is the fluid clean? How about the brake pads and calipers? Pulsing is usually a sign of a warped rotor but it can be anything else in the brake circuit.

As brakes are a life and death proposition I think you need to delve into this. If the fluid is dark it needs to be changed out for certain but I wouldn't stop there if you don't know the history. A full teardown, clean and rebuild may be in order. On the last 4 bikes I've rebuilt I found rusted pistons. Two were seized.

For some reason people don't pay a lot of attention to brakes until something goes wrong. IMHO opinion they are too important to ignore.

Good luck with it.

cheers,
Spyug

[GSQC]

the fluid is dark, I think I will process to a rebuild .I dont want to scrap my first season!

[Digitus]

check for loose steering stem bearings. Put the bike on the center stand, have someone sit on the backseat so the front wheel lifts and grab the underside of the forks and feel if theres movement in the forks when you yank at them