Problem with GSXR front brakes.

Hi all,

I have a serious problem. I have just completed a GSXR front end conversion on my SV k4n. I have got GSXR k6 forks, bottom yoke and spindle with GSXR 1000 k6 callipers and a GSXR 1000 k5 radial master cylinder. For the front wheel I have a SV1000 wheel and disks. Evrything bolt up ok. Put after fitting the wheel and callipers and blending them up I got a heavily binding front wheel. I stripped and cleaned the calipers and greased the pistons and rebuilt. The binding has improved but when I test rode the bike after 1 mile the pressure on the lever increased to the put where the front brake locked on and I coulden even move the lever. After allowing to cool for 10 mins I was able to ride the bike again but the rubbing is so bad it causes the disks to get so hot.

Has any body experienced this problem before? Or am I using incompatable parts? I am really stumped with this one and and help will be appreciated. Has anyone done the conversion with the same parts I have used?

Please help guys as I really need my bike sorted

Cheers

[andrewsmith]

It sound like the calipers need a rebuild with new seals.
Is the brake lever a pattern or genuine one?

try testing another master cylnder to rule that out

I'm using a pattern brake lever. It's one of the short spazzo type that are on eBay. I have rebuilt and copper greased the calipers the seals where all ok, no dirt or grit. The only other master cylinder I have is the standard naked sv one non radial is it worth trying that?

I think I read something on sv rider about wheel compatabilty and am wondering if the 06+ forks only take the wheel and disks from the same years??


Did you get my message Dave?

[maviczap]

Check the brake lever, some have been known to cause this problem I seem to recall

[andrewsmith]

Originally Posted by maviczap

Check the brake lever, some have been known to cause this problem I seem to recall

Yes few racers have had brakes lock on and spit them off.
Typically whats happens is what your suffering

So put the standard brake lever back on? Worth a shot.

Can anyone confirm or deny for definite my thoughts about the wheel?

[andrewsmith]

I think the SV1000 wheel is compatable
Others will confirm this

[flymo]

assuming there is some play at the lever (it shouldnt be pressing against the master cylinder plunger when the lever is in its normal position). Check the caliper positions laterally, do the discs look to be roughly in the center of the caliper gap or miles out? If all looks well then I would agree with Andrew, the pistons may be binding and not returning properly in to their bores when you release the lever.

If so, then strip and service the calipers.

The disks don't look to be central, the outside pistons seem to be tighter against the disk than the inside. I have allready striped and serviced the callipers, and copper greased the pistons. The calliper seals where very clean so didn't replace just removed, cleaned and replaced