England-Kev
Registered user
Have any of you had a problem with the front brakes sticking? all caliper pistons are clean and free, but if you apply the brakes they stay on, it is the same with the ABS turned on or off.
F800 Front Brakes Sticking On
- Thread starter England-Kev
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England-Kev
Registered user
no, everything is in good condition, caliper pistons are free, pads are not tight on the pins, but as soon as you apply the brakes, they stay locked on?
Very strange
Very strange
no, everything is in good condition, caliper pistons are free, pads are not tight on the pins, but as soon as you apply the brakes, they stay locked on?
Very strange
Well clearly everything isn't in good condition otherwise this issue wouldn't exist!
From the lever to the pads everything is liquid and mechanical so something is not in good condition. Have the calipers actually been stripped and inspected?
It is not an electronic thing so no reason why the ABS, one way or the other would make any difference.
Wal2
Registered user
had this years ago on a Yamaha,(only 6 months old bike), braked hard for a railway crossing, and they didnt come back off, really weird, stayed upright though......when i stripped it down, one of the pistons was stuck solid, it was rusted all round the piston behind the seal as well !!!, had to use compressed air pipe to blow it out
Check that you have free play in the lever, ie, there is a gap between the master cylinder spool and the adjusting screw that pushes against it on the lever.
If there is no free play the fluid is sent to the caliper when the lever is pulled, but can not return as the spool is holding the return port closed in the master cylinder.
That's about as easy as i can describe it in layman's terms.....
If there is no free play the fluid is sent to the caliper when the lever is pulled, but can not return as the spool is holding the return port closed in the master cylinder.
That's about as easy as i can describe it in layman's terms.....
Has it got standard/genuine levers?
My best guess is a sticking piston.
My best guess is a sticking piston.
StumpyFingers
Registered user
I had this problem on my XL650, it was a seized piston and a tight slider. The only way I could clear it was a complete strip down of the callipers and a good clean. No problems since.
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tosh23
Registered user
The sliding pins
Blind Lemon Ade
Registered user
When you say the brakes "stay on", do you mean that you can't ride the bike as they're jammed on tight, or that the pads remain lightly in contact with the disc (such that you could spin the wheel by hand, but it wouldn't keep going...)?
My Guzzi (single 4-piston Brembo caliper) had three seized pistons, and one piston which moved. The brake still worked, they just felt a bit "wooden". In fact, I rode it home round the M25 like that!
The F/GS series have the old-fashioned one-sided sliding calipers (with two pistons on the same side), so there are the caliper sliding pins (as stated above) to check as well...
My Guzzi (single 4-piston Brembo caliper) had three seized pistons, and one piston which moved. The brake still worked, they just felt a bit "wooden". In fact, I rode it home round the M25 like that!
The F/GS series have the old-fashioned one-sided sliding calipers (with two pistons on the same side), so there are the caliper sliding pins (as stated above) to check as well...
Dave Ett
Registered user
An off the wall alternative is that the brakes have been off and you've twisted the pipes to them during refittment. This has caused the inner of the pipes to close up such that it take the pressure of applying thr brakes to overcome the twist, but there's not enough pressure to allow fluid back again when you release them.
Old pipes can also act like a one-way valve when they degrade, but no F800 is old enough to be suffering that yet...
Old pipes can also act like a one-way valve when they degrade, but no F800 is old enough to be suffering that yet...
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