Well I've read about it but never have had a problem until today. I installed a new front tire yesterday and in the process noted that my front brake pads were very thin. I removed the pads from the right side and headed down to the local shop but they only had one set. No problem I'll just reinstall the old ones and order another set. I got everything back together and now I don't have any front brakes. I bled both calipers and noted no air bubbles. I then turned my attention to the master. I put a mity vac on the master and all I get is bubbles. When I attach a hose to the master with no mity vac and pump the handle I get no bubbles. I bled both calipers again and am still stuck with no brakes. The brake handle will become firm and then goes soft. The brakes were great until yesterday. Any thoughts? As always I appreciate the input. Thanks.
BTW I've bled the brakes in the past with no issues. This is the first time I've ever touched the bled valve on the master.
Two points I always stress when doing front pad removal...both on the C10, and the C14...
First, before I remove the pads, I stick a thinner piece of would, or plastic in between the old pads, and gently compress the brake handle to push the pucks out about 1/16" or so, then I pull the pads and springclips...and completely clean the pistons on both sides with an old toothbrush and brake cleaner spray, to remove any possible adhered debris, and caked on crap, before pushing the pistons back into the caliper, also clean every surface of that inner caliper in the same manner, to make sure its clean.
Second
When I reinstall the wheel, I make sure the rotors are also cleaned, and I spray all the "buttons" down well to remove grit... then install wheel, and tighten the axle and nut using 2 wrenches... without doing the pinch bolts... I then install the calipers and pads assembled, onto the forks and with the axle still unpinched in the forks, I spin the wheel and clamp the brakes on, repeatedly, while watching the contact of the rotors, and pads, and axle position... if I see a larger gap on either side, I keep repeating this...
It centralizes the axle and wheel, between the "happy place" the assembled calipers distance provides between them... once I am happy that no rubbing is going on, I tighten the pinch bolts. This method seems to work well for me, and I've been doing it for many years..