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Old 08-11-2012, 04:27 PM
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30 coupe losing brake pressure

Hi, need a little advise please. I have a 30 model A coupe 350/350 and disc fronts and drums rear. The system is fairly new, I ran my own steel lines and got a corvette cylinder from So-Cal. Im not running a booster and plumbed the two residual valves in with a wildwood proportioning valve. I bled the brakes and had good pedal and can see no leaks. It sat in my garage for a week and when I got in the pedal went to the floor. If I pump them, the pedal comes up but Im losing pressure somewhere. I had the cylinder for a year before installation and sat there dry for another six months before I pulled it and primed it. Kids could have pumped them playing in the car so Im wondering if it could be the master? Like I said everything looks dry at all conections so Im confused. Could be me cuz I aint getting any younger. anything you can come up with I'll check. Bill

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Old 08-11-2012, 05:34 PM
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Bill, I have had a similar ongoing problem in my sedan. So have several others on this forum if you do a search.
First I will reccommend going to MP brakes site and order a catalog. They have a lot of info on there maybe able to access it on their site.
Start with being sure that no air is trapped in the calipers. The bleed screw should be at 12 o'clock to get all the air out. Also rebleed the MC.
If you are running a combination valve be sure it is centered so pressure to both front and rear.
I assume underfloor MC so residuals are in place.
I don't think pressing the pedal dry would cause to much problem, however replacing the O rings may be needed. The feel would be different though.
When you pump them up does it hold. If not it would be the MC.Or a leak.
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