- Joined
- Jul 24, 2006
- Messages
- 1,055

I've had cause to bleed my RGM sleeved master cylinder today. I've done it a couple of times before without any problems, but today I could not get the fluid to move out of the master cylinder. I dismantled it, checked the seals, placed the master cylinder in several positions and the piston in three different positions. If I depressed the lever and then blocked the bleed valve on the caliper, released the lever and then removed my finger I got the sound of a vacuum drawing air in.
I have a pressurised bleeding kit which I bought in the 1990's so I tried to pressurise fluid from the master cylinder into and then the feed pipe and caliper. All that happened was the master cylinder slowly filled and then overflowed from the very slight air leaks where the pressure cap seals. I then tried the lever fully depressed all too no avail.
In the end, I attached the pressurised bleeding kit onto the bleed nipple outlet (without the nipple) and I reverse bled the system from the bleed nipple on the caliper and thankfully it worked. I was minutes from ordering a Brembo master cylinder and all of the other bits you need to get such as new switch gear etc.
I'm not really asking a question but relaying my unusual (for me) experience that I have had today in case it is of any help to somebody but I still don't know why I had so much trouble?
I have a pressurised bleeding kit which I bought in the 1990's so I tried to pressurise fluid from the master cylinder into and then the feed pipe and caliper. All that happened was the master cylinder slowly filled and then overflowed from the very slight air leaks where the pressure cap seals. I then tried the lever fully depressed all too no avail.
In the end, I attached the pressurised bleeding kit onto the bleed nipple outlet (without the nipple) and I reverse bled the system from the bleed nipple on the caliper and thankfully it worked. I was minutes from ordering a Brembo master cylinder and all of the other bits you need to get such as new switch gear etc.
I'm not really asking a question but relaying my unusual (for me) experience that I have had today in case it is of any help to somebody but I still don't know why I had so much trouble?