'juddering' front brake.

Warped discs. (or a high spot on the discs, same difference)

Light pressure allows the warp to show itself and heavier pressure keeps the pads in the same place and the judder transfers through the disc pins.

Bear in mind it might only one of the discs that's warped. Take the wheel out, remove one of the disks and put the wheel back in and check for the judder. If its gone you got it. If not, Drop the wheel and prise the bads back and remove the other disc and replace the one you took off. Try again. Gone?

Temember to pump the pads with the lever before you move the bike each time to push the pads out .

Or its a poodle under the seat, scratching as you brake

C

Unfortunately my paddock stand is in work so haven't checked headstock bearing. Will warped discs be covered by warranty since they're defective? I'll give the garage a call they're decent people so I'm sure they'll replace if they're dodgy. Will check headstock first and then look for the poodle / custard

Originally Posted by sauluk

Will warped discs be covered by warranty since they're defective?

Worth a punt but doubtful I would suspect.

Berlin please repeat your last post with the added advise to make sure there is always enough brake fluid in the reservoir. Thanking you kindly.

Make sure there's enough brake fluid in your reservoir.

There should be, because you've only removed one disc and therefore only one set of pads will come together. This is a movement of about 4-6mm to take up the space left by the missing disc. Or the same as the thickness of one pads worth of brake material. As, with 4 pads in the front calipers, there's approx 16-20mm of pad material to wear away during the life of the pads then there should be enough to handle 4-6mm of movement.

But check anyway.

... and check there aren't any penguines in there too. They can block the cables.

C

Very good point but you never know!

Any news? Was it the penguins?

C

No news, I'm going out tomorrow to take the brakes off and get some brake cleaner on discs and service the caliper. If it still does it after that I'll book it in so they can check the discs! (and penguin based issues)

Serviced brakes today and cleaned everything up. Pads looked like this:


So don't look great and are pretty mirrored, don't know if they're glazed or not though. I had the bike from 600 miles so the prev owner could have glazed them when new?

Also the pins looked a bit corroded:


(don't worry, that's after wiping the copper slip off them, they weren't dry!) Would that stop the pads moving freely?

Everything else seemed fine, one of the discs had a slight score in it but nothing severe.

[yorkie_chris]

You need to get the wheel in the air and spin the wheel to check the discs for wobble.

Pins look fine