Well weather in the uk has been shit since december---rain rain rain ---high winds--cold temp 4c etc soooo--time for something i`ve been putting off since last year and its those front calipers sticking on after sitting for a week or so.
No half measures this time:---
Rebuilt the master cylinder with a complete kit after checking the bore had no scores or wear.
Rebuilt the calipers with new seals after a thorough degrease and check once again that the bores were perfect and treated them to a set of stainless steel pistons and bleed nipples.(THANKS MR.CHAMBERS)
All the seals were assembled with castrol red grease which makes assembly far easier than using brake fluid.
Bike already had stainless dual hoses fitted so five new copper banjo washers and new dot 5.1 fluid and we were ready io bleed the system.
Long story short--an hour and a half and 500ml of fluid later still no firm lever(it comes back to the bar) if i pump the lever 2/3 times the bike has a firm lever ---leave it for 5 minutes and its back to the bar!!!!!--Two more pumps and a firm lever again.
All joints are tight with no weeps or leaks anywhere---i have bled the calipers the conventional way and also used my Mityvac vacuum on them and there are no more air bubbles in the bleed tube------ and all to no avail.
Any ideas out there??---Never had this problem with brakes before--Am I missing something obvious ???