brake lever pulses

[Steve97]

Cant seem to sort this, have tried

calipers inc pistons
discs
head stock bearing
bled the system endlessly
master cyl seal kit
have even put different forks on,
all to no avail

your thoughts are appreciated

[Watty]

Cant seem to sort this, have tried

calipers inc pistons
discs
head stock bearing
bled the system endlessly
master cyl seal kit
have even put different forks on,
all to no avail

your thoughts are appreciated

Disc bobbins

[Steve97]

Done !
No difference

[Varastorm]

I take it you've tried swapping all the mentioned parts & it still pulses at the leaver?

Sounds odd that it's still doing it, but if you still feels pulsating my next step would be to get hold of a DTI (clock dial gauge) & start measuring things up

You can try cleaning the bobbins on the discs like Watty mentions.

[youtube][/youtube]

Hope this sorts it. But to me, it sounds like classic warped disc symptoms

[Steve97]

Had the wheel off and rigged up on a balancer for wheels, the discs fly straight, if a little thin at just under 4mm

[Cadbury64]

Just as a slightly random suggestion, how about undoing one disc, rotating it 180 degrees and bolting it back up? That way if there is some sort of synchronisation between the discs now that causes pulsing, you might eliminate it. No idea if that would work, but it won't cost anything.

[Watty]

Front tyre!?

[Steve97]

Front tyre!?

Its new, and have checked it over

[Steve97]

Just as a slightly random suggestion, how about undoing one disc, rotating it 180 degrees and bolting it back up? That way if there is some sort of synchronisation between the discs now that causes pulsing, you might eliminate it. No idea if that would work, but it won't cost anything.

Will try this tonight !

[sirch345]

Had the wheel off and rigged up on a balancer for wheels, the discs fly straight, if a little thin at just under 4mm

Personally I'd say checking the front wheel and discs for run out in the bikes forks would be best, after all that's where they will be running when on the bike Remove the brake calipers or pads and front mudguard to do this, I attached a piece of wire to the fork leg covered in insulation tape so it didn't scratch anything when you spin the wheel. If you have a dial-gauge that would be even better than using a piece of wire.

Have you checked there's no play in the front wheel bearings by hold the wheel at 180* with each hand and rocking it
I'm assuming the front wheel spindle is straight

Running the disc's off-set is worth a try, as Cadbury64 suggested,

Good luck,

Chris.

[Steve97]

Hi Chris
Yep already done all that buddy,
I'll whip the discs off tonight and reseat them

[bazzashadow]

have you painted your wheels?

[Steve97]

have you painted your wheels?

Nope

[darkember]

If everything is square and true. And you can be sure of that then it leads to a fluid issue. What system are you using?? Standard with splitter over the mudguard or race setup with singles to each caliper?? If using the splitter it could have an airlock in it..

[bazzashadow]

have you painted your wheels?

Nope

just wondered
I had mine painted and then scrapped the paint off were the disc bolts on so it had no paint squashed between it