XT660Z new front brake discs needed !! - .: XT660.com

kinioo · # 1 21-09-16, 20:30

OK,

After my recent problem with front brake caliper/discs, bobbins etc.

I will need new set of front brake discs complete with new set of bolts!!

1) Where is the best place to buy them from ??

2) What is the best way to undo disc bolts - it wont be easy.

I understand the hub is aluminum so it should be done gently...

Is it better to try to do it with wheels on the bike or off the bike or just take the wheel to the garage ???

BTW, I cannot ride to the garage due to the brake problem.

Many thanks,

Chris

kinioo · # 2 22-09-16, 09:14

Hi all,

Found this: https://www.ajsutton.co.uk/product/Y...FUefGwoduf4Gpw

Says Yamaha Genuine, so assume would be ok.

Are these left & right or it does not matter (judging by the diagram provided it doesn't matter)

Mine is non ABS version.

Still need some advise whats the best way to remove/undo old bolts ???

Thanks,

Chris

kinioo · # 3 22-09-16, 14:00

Quote:

Originally Posted by Pepsi

Can I ask why you need new discs? Was it that one was badly damaged when it contacted your caliper? It would be the aluminium caliper that would probably be damaged before the steel disc gave up, or is it that the disc is now badly warped? Just trying to save you a lot of money before you commit to finding out that the problem is still there after new discs are fitted.

Hi there,

The calliper is OK as I didn't use the bike once I noticed the disc was rubbing (which was literally when I wanted to ride my bike after it had sat in the garage).

Yes, the discs seem to be badly warped/seized. I tried to clean the bobbins but it barely made any difference.

The other thing I discover yesterday is something I don't know how to explain (may take some pictures later), but RHS (clutch side disc, which causes the problem) is bending/flipping when I press it with my fingers - what I mean is I can literally flip it to the left to slightly change its position (so its not rubbing the calliper) but once the brake is applied it gets back (flips back) to its original position and rubs the calliper.

C.

Well, if the discs from my link are suitable its �55 a disc, so not so bad and might be worth doing it and get them changed.

What I am worry about is the old disc bolts - they will be pain in the as* to remove.

Pleiades · # 4 24-09-16, 21:28

Quote:

Originally Posted by kinioo

The other thing I discover yesterday is something I don't know how to explain (may take some pictures later), but RHS (clutch side disc, which causes the problem) is bending/flipping when I press it with my fingers - what I mean is I can literally flip it to the left to slightly change its position (so its not rubbing the calliper) but once the brake is applied it gets back (flips back) to its original position and rubs the calliper.

That is the primary symptom of the seized and gummed up bobbins you've identified. The discs should "float" on the carrier with a fairly light touch. If they are sticky or stuck the disc will tend to get marooned in one position or other and move jerkily (if they move at all) as you have found.

OE discs are cheaper than decent aftermarket discs (EBC etc.) on the front, so buy OE. You can get cheap Chinese wave discs but they are more trouble than they're worth!

Interestingly at the rear, it's a different story - the OE disc is double the price of an EBC item!

Provided you can get the disc bolts out without damage then they'll be fine to re-use with a thin application of Loctite. If in doubt though - change them. Don't buy OE bolts though as they'll end up costing you as much as the discs! Go visit your local fastener shop.

Fitting new pads with new discs is always advisable even if you think they are fairly new/good; especially so if the discs haven't been running true.

kinioo · # 5 26-09-16, 09:15

Quote:

Originally Posted by Pleiades

That is the primary symptom of the seized and gummed up bobbins you've identified. The discs should "float" on the carrier with a fairly light touch. If they are sticky or stuck the disc will tend to get marooned in one position or other and move jerkily (if they move at all) as you have found.

OE discs are cheaper than decent aftermarket discs (EBC etc.) on the front, so buy OE. You can get cheap Chinese wave discs but they are more trouble than they're worth!

Interestingly at the rear, it's a different story - the OE disc is double the price of an EBC item!

Provided you can get the disc bolts out without damage then they'll be fine to re-use with a thin application of Loctite. If in doubt though - change them. Don't buy OE bolts though as they'll end up costing you as much as the discs! Go visit your local fastener shop.

Fitting new pads with new discs is always advisable even if you think they are fairly new/good; especially so if the discs haven't been running true.

Thank You Pleiades, you have been very helpful.

Yes, am thinking of new set of front discs plus pads (I have already asked for new pads, and (not surprisingly, you provided me with a source link) I already bought them).

I have cleaned the bobbins as you said (YT video), but it didn't help much, thus new disc time.

Will go for OE (the link I attached).

The bolts...I don't worry if the bolts get damaged when removing, I am worry about aluminium hub...?!

If the bobbins are badly seized probably the bolts will be even worst !!

C.

nikroc · # 6 30-09-16, 11:54

I have previously struggled with disc bolts and found a relatively straight forward way of undoing them was to use an impact driver. Make sure you have a nice tight/good fit in the 'socket' of the bolt and initially give it a good tap turning it tighter..yes tighter. THEN REVERSE DIRECTION AND TRY...

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