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BigAl Breland (aka BigAlBre) [ View ] [ Email ] [ Car Ads ] [ Blogs ] St Pete Beach, Florida (866) 787-6337  Big Al sittin back in paradise.

I am installing a factory style (after market) proportioning valve on my 36.... does it matter if it sit's upright or not? I laid it on it's side? After installing the proportioning valve and bleeding the brakes we noticed that you can pump the brakes up and try and hold the pressure and the pedal slowly goes down.... I don't see any leaks... what's up with that??

Comments

Posted by aosborn  -  04/14/2008 08:50 AM Typically the proportioning valve is mounted with the center electrical switch pointing up. It should function properly regardless of the mounting position, but it may be harder to bleed out air in a non-standard position. The pedal dropping could still be from air in the system, or another fairly common problem is fluid bleeding back internally in the master cylinder, that is why you are not seeing any leaks. Check the back of the master cylinder where the brake pedal rod goes in, a leak there may not be noticed right away, or even at the wheel cylinders if you have drum brakes. aosborn [ View ] [ Email ] [ Blogs ] [ Car Ads ] Olympia, Washington   Posted by ronhotrod  -  04/13/2008 12:18 PM try using a hand vaccuum pump to bleed the brakes. simply apply a light grease coating around the threads of the bleeder valve (to seal it from air leaks) and attach a rubber line to the bleeder and then to the pump. As you pump vaccuum the fluid is pulled to the pump and you will see bubbles. When the air is all out, the bubbles stop. Start with the right rear, then feft and so on as usual. This method removes more air bubbles than pumping the pedal. It can also be done by one person. As for the valve it can be mounted in most any position AS LONG AS it sits level. Inside is a slide valve that shuts off fluid in the event of a leak. Mounting it at an angle (front to rear) can cause the valve to eventually vibrate back and shut off fluid flow. The other cause of pedal bleed down is of course a bad m/cyl. or leaking booster. Start the car and let it run for a couple of minutes. Then turn it off and pull the black valve from the booster. If you hear it suck in air its good, if not........ Or you can leave the car sit for an hour, push the pedal before starting the car and hold pressure on it. Then start the engine, if the pedal goes down slightly AND stays, the booster is good. ronhotrod [ View ] [ Email ] [ Blogs ] [ Car Ads ] Mount washington, Kentucky Charter Member since July 2001   Posted by hotrodgene  -  04/13/2008 03:49 PM Al you will have to replace the master cyl.I have run into it,like setting at traffic light and brakes will drop a little then will drop again until pedal hits the floor. Thanks,Gene [ View ] [ Email ] [ Blogs ] [ Car Ads ] Saint Petersburg, Florida   Posted by jimmothershead  -  04/14/2008 08:48 AM Mr. Brake, Ralph Esina, ECI, 860 872 7046 Jim [ View ] [ Email ] [ Blogs ] [ Car Ads ] Huntingtown, Maryland   Posted by BigAlBre  -  04/14/2008 10:34 AM Thanks guy's..... Big Al sittin back in paradise. [ View ] [ Email ] [ Blogs ] [ Car Ads ] St Pete Beach, Florida Charter Member since June 1999   Posted by Crazyhorse Rod Shop  -  04/14/2008 04:27 PM al, when bleeding brakes never pump the pedal. if you do you will aerate the fluid and in some cases have to replace it. dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003   Posted by aosborn  -  04/14/2008 09:52 PM Shine, I have to wonder how pumping the brake pedal to bleed the brakes is going to ruin the brake fluid? True that pumping the pedal rapidly when there already is air in the system can aerate the fluid, but the air will bleed out, it just takes longer. Pump the pedal slow and smooth, hold the pedal down and then crack the bleeder is the most universally accepted way to bleed brakes I am aware of. aosborn [ View ] [ Email ] [ Blogs ] [ Car Ads ] Olympia, Washington   Posted by Crazyhorse Rod Shop  -  04/14/2008 10:14 PM when pumping the pedal large volumes of air are broken into smaller ones. pump it enough and it will become foam. i press the pedal down and open it, and let the pedal up slowly after it is closed. i do not set there and try to pump up a hard pedal. just about every person i've ever seen do will pump the pedal over and over to see if it will pump up. 9 time out of 10 they end up with a soft pedal. milky fluid is not always moisture , it is air. i learned this as a hydraulic tech in aviation. you aerate the fluid in a hydraulic system and you end up flushing it. dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003   Posted by BigAlBre  -  04/14/2008 10:25 PM Thanks Shine.... we were definitely pumping it... what should I do now? Big Al sittin back in paradise. [ View ] [ Email ] [ Blogs ] [ Car Ads ] St Pete Beach, Florida Charter Member since June 1999   Posted by aosborn  -  04/15/2008 12:52 AM Pump the pedal slow and smooth 2-3 times and hold it, loosen the bleeder 1/4 turn and retighten. repeat until it runs clear. Big bubbles or little, air is air and you need to get it out of the system. Every mechanic (myself included) on every race team and in every hot rod shop I have been associated with does it this way and if you take your time you won't go wrong. Also, be cautious of "one man" bleeding systems, with vacuum pumps or preasure systems, the best way is with a helper on the pedal and you on the wrench at the bleeder screw so you can see what is going on when the fluid comes out. aosborn [ View ] [ Email ] [ Blogs ] [ Car Ads ] Olympia, Washington   Posted by Crazyhorse Rod Shop  -  04/15/2008 07:01 AM i'll send you an email al. dont poke the porchdog........he bites [ View ] [ Email ] [ Blogs ] [ Car Ads ] BLUFF DALE, Texas Charter Member since March 2003   Posted by BigAlBre  -  04/15/2008 09:54 AM thanks guy's Big Al sittin back in paradise. [ View ] [ Email ] [ Blogs ] [ Car Ads ] St Pete Beach, Florida Charter Member since June 1999

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