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Front Brake Hydraulics Issue

Meon2wheels

Meon2wheels

Loving Life
GT Contributor
Joined
Sep 17, 2021
Messages
23
Location
Cincinnati, OH USA
Searched - didn't find anything related:

Anybody else experience this?: riding along just fine on the curvy roads, brakes fine (firm & consistent), after many miles, I brake for a turn and the lever moves ~1 inch further than normal, but still firm. Second application and it's back to normal. Ride for many more miles then it happens again. Brake hydraulics are very firm when applied, terrain is relatively smooth, brake action is smooth (no chatter or pulsing), pads are only 10% worn, rotors are smooth and clean and tight tight, wheel axle is tight, fluid is <1 year old and clear, bike has 10k miles on it. Symptoms are very similar to when the brake pads get shoved back following a violent head shake. I don't use the rear brake much so can't comment on it, other than I do seem to have to bleed it one or twice a year to keep it firm. Any ideas? Jim
 
Last edited:
Hi.
Off the top of my head:
Water in the fluid? Have you ever topped it up and maybe used the wrong spec fluid? It may help to have it pressure bled by a specialist.
Good luck!
 
Meon2wheels said:
Symptoms are very similar to when the brake pads get shoved back following a violent head shake.
Click to expand...
Can't relate to that either but I have experienced what you describe. I once refurbished front callipers on my 750 Virago including new seals. They turned out to be just a tad too big, which I should have realised by the effort required to get them in. End result was as you describe. The seals were pulling the pistons in away from the pads requiring a second pull on the lever to get them out again. Sounds like you haven't removed the seals though so all I can guess is the calliper needs a good clean or rebuild. I would try bleeding again first though.
 
kenrover said:
Hi.
Off the top of my head:
Water in the fluid? Have you ever topped it up and maybe used the wrong spec fluid? It may help to have it pressure bled by a specialist.
Good luck!
Click to expand...
Thanks Kenrover. Pretty confident the fluid is free of water. It's crystal clear and came from a new container of DOT 4. Although I have pretty good brake bleeders (Phoenix Systems and MityVac), I may have the shop give it a try. Jim
 
I have that issue on my Breva rear brake, its the vibration on the caliper, as it moves on its pin it pushes the pads in a very small amount. I regularly operate the pedal very lightly so that when I do need the brake its not a shock. Try it yourself, grab hold of the rear caliper and wiggle it back and forwards against the disc, then operate the pedal and you'll find it goes down further than expected, then operate it again and it'll be back to normal. I don't think there is anything wrong.
 
Kevin.NZ said:
I have that issue on my Breva rear brake, its the vibration on the caliper, as it moves on its pin it pushes the pads in a very small amount. I regularly operate the pedal very lightly so that when I do need the brake its not a shock. Try it yourself, grab hold of the rear caliper and wiggle it back and forwards against the disc, then operate the pedal and you'll find it goes down further than expected, then operate it again and it'll be back to normal. I don't think there is anything wrong.
Click to expand...
Thanks Kevin. I do see movement on the rear brake caliper. The front calipers are solid however (or appear that way), but I'll certainly give them another look. I also prevent surprises by operating the front brake lever a little before a spirited turn entry, but I shouldn't have to. Thanks for your input. Jim
 
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