Evening all,

Having some fun bleeding the brakes. Bought a cheap vacuum pump to bleed the brakes but the nozzles supplied for the bleed nipples were not great qaulity so ended up introducing alot of air into the modulator and caliper on the rear brake. The brake pedal is now lifeless and rear brake does not work at all.

Anyway I binned the cheap plastic fittings and used a rubber hose. All attachments are now good and snug so no leaks in the system and a good vacuum created by the pump. However now I am unable to get anything from either bleed nipple despite a good pressure on the vacuum gauge, no air leaks and a full resevoir with the lid off.

Any ideas what I have done?

Hi , I have had good success with a very large syringe the type used for horses,load it up with fluid and push the fluid thru from the caliper to the master.

With the rear brake if you apply too much pressure you can jam the master cylinder piston down the bottom of the cylinder which prevents the fluid being bought through. It feels like the piston is returning but it's only the spring on the pedal.
You will have to release the small socket head screw that prevents the piston comming out. Just back it off a turn and you may hear the piston return.