I have a 41 chevy coupe i built back in 2001. It has always worked great for the first 30,000miles. In the last year if it sits any length of time( 2 weeks- month) the brake pedal will go to the floor and it has to be bled to get the air out of it. I seem to get most of the air in the rear brakes. It has a must II front with the big brakes, camaro rear with stock drums, stock type prop valve, corvette style master with small booster under floor and check valves in the front and rear lines close to the master. Last year when it happened the first time, i went through and tightened all the fittings and lines. This spring i replaced the check valve for the rear brakes. It has worked great all summer until last night, I went to get it out (it has been parked since the beginning of aug) and the pedal went to the floor again, so I bleed the brakes again and every thing works again. What am i missing?
Copper washers at the front disk brakes will allow air in and very little out if not seating correctly.
I finally had time this last weekend to get the car on my hoist. I looked at the lines, master and etc. I had a feeling it was in the the rear wheel cyls, so i got a couple last week.. I pulled the rear wheels and drums off and when i pulled the dust boots on the cyls back there was some fluid, so i assume i found the problem. I changed them and flushed and bled the system. should be good.
Was it losing fluid? You should have been able to see it somewhere. Leaky wheel cylinders could do it especially if they are higher than the master. At least you have ruled those out, see how it behaves.
It never lost any fluid that was visable. It just kept getting air in the rear brakes. I didn't see any fluid until i pulled back the dust boots on the rear wheel cyls.
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