rear caliper seals

[janner_10]

Thanks for all your info Born - tried all your tips to no avail. In the end I brought a recon'd rear master cylinder from ebay for £12 - back break is bloody perfect now.


(The tell tale sign for me was the lack of a little woosh of fluid into the reservoir when the pedal was depressed)

[unfazed]

Fit a Fzs 1000 rear caliper (01 to 05 model) and  problem solved. Never had an issue with the rear brake since fitting it, looks better also

[DryRob]

This trick with bleeding at the banjos, does it compromise the seal that the crush washers make?

[Fazerider]

This trick with bleeding at the banjos, does it compromise the seal that the crush washers make?

It's not something I do unless I've had the banjo off completely, but I've never had a problem re-using the copper washers. Just make sure you don't get dirt under them. So long as the area is clean and the surfaces are undamaged they reseal fine. The tiny deformation they undergo when the banjo is nipped up isn't enough to work harden them.

[bikemad62]

I got a couple of usefull tips from a main dealer mechanic for the seal problem (1 )Use rubber grease on the seals when fitting the grease sits in the gaps topping the crud building up and the pistons slide in dead easy. (2) is a cleaning tool get an old pushbike spoke sharpen the end then bend it close to the end and this makes an awesome cleaning tool for the seal slots. Bend the other end into a handle.and buy good seals not cheap ebay ones.

[Slaninar]

[quote author=DryRob link=topic=1861.msg18074#msg18074 date=1332950628]
This trick with bleeding at the banjos, does it compromise the seal that the crush washers make?

It's not something I do unless I've had the banjo off completely, but I've never had a problem re-using the copper washers. Just make sure you don't get dirt under them. So long as the area is clean and the surfaces are undamaged they reseal fine. The tiny deformation they undergo when the banjo is nipped up isn't enough to work harden them.
[/quote]

Copper washers are too cheap to not replace them. It also takes les torque to seal everything when one puts new copper washers. I always replace.