GavinH Posted March 22 Share Posted March 22 I got the bike out yesterday after not using it at all last year and it was generally fine but the rear brake was binding a bit so I decided to overhaul it and replace the seals. It appears that Beta only do a kit which includes new pistons, which I don't need - has anyone found an aftermarket supplier for the seals only? Quote Link to comment Share on other sites More sharing options...
GavinH Posted March 22 Author Share Posted March 22 Scrub that, I just found some on FleaBay 🙂 Quote Link to comment Share on other sites More sharing options...
JK-scotland Posted 23 hours ago Share Posted 23 hours ago Hello Gavin - your story sounds similar to mine! Can you tell me how you got on with your e bay seals? Can you share a link to the item you got (if forum rules permit)? My bike is the Evo 300 from 2013 with the Braktec/AJP brakes. Quote Link to comment Share on other sites More sharing options...
GavinH Posted 4 hours ago Author Share Posted 4 hours ago (edited) Hello JK, I bought these https://www.ebay.co.uk/itm/306807336648 and they don't fit 😁. I solved the problem by doing what I used to do on my 1980s/1990s commuter bikes... The problem is caused by corrosion inside the grooves that the seal sits in - the corroded alloy increases in volume and forces the seal tighter against the piston until eventually it is so tight that the piston can't retract when the pedal pressure is released. I took the caliper off, drained the fluid, popped the pistons out with a foot pump, and carefully prised the old seals out. It's then just a case of carefully scraping the corrosion out of the grooves - I used a right-angled dental pick which ended up in my toolbox years ago (I have no idea why!) but in the past I've also used a pop rivet shaft with a 90° bend at the end. The corroded alloy also 'grows' into the back of the seals so you need to scrape that off with your thumb nail. I then put a drop of ACF50 into the grooves before refitting the seals and piston, reconnecting the hoses and bleeding the system. The caliper has worked perfectly for the last couple of months and I only ever had to do it once on my old Yamaha commuter bikes, which I kept for many years after doing this fix. I was initially cautious about the ACF50 contaminating the brake fluid but I never experienced any problems. It takes me a few hours but it seems to be a permanent fix. I hope this helps. Edited 2 hours ago by GavinH clarity Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.