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Did you bleed the rear chamber of the MC separately? If not, start there. Mix & match brake part problems are always difficult to solve. The most common cause I have seen is the brake light switch mounted down on the frame. They corrode inside over time, and the piston never moves out of the center. When you bleed 1 side with air in the other, it forces the piston all the way to the air side where it sticks in the corrosion. The quick shop fix i learned was get some one to pump the brakes up fully, tap the valve with a hammer to jar the piston, and open the front bleeder to release pressure on that side. This uses the hydraulic pressure in the back side to push the piston back toward the front (now low pressure) side. You can hear the piston snap back when it releases. May take several tries. They'll take a pretty good whack without breaking usually. If this is unsuccessful, replacement is the only option. Make sure MC is bled first. You can do a fluid flow check before trying this if you want by bleeding your MC chamber first, then checking flow in & out of the switch to verify that its different. At the shop we never spent the time, you just whacked 'em & they usually cleared up. A crimped line on the back section of the system or damaged hose would also cause you trouble. If the car has been disassembled and worked on alot since it ran, I'd look at those issues first. P.S. When you get it working, get the proportioning valve. Improves safety & helps avoid premature wheel lockup. Good luck Glenn >From: Michael Pell <[EMAIL PROTECTED]> >Reply-To: [EMAIL PROTECTED] >To: ChevelleList <[EMAIL PROTECTED]> >Subject: [Chevelle-List] Help: Ford 9" with disk brakes on a Chevelle? >Date: Tue, 30 Oct 2001 10:42:41 -0500 > > >Replies to this message are sent to The Chevelle Mailing List >------------------------------------------------------------ > > >I'm building a pro-street '69, and put in a Ford 9" rear with the Ford >OEM disk brakes. >I have the stock '69 Chevelle Master Cylinder for a manual disk brake >car, it's the big one. >The front brakes are GM stock brakes for a '69 Chevelle. >Everything is brand new (MC, calipers, hoses, shoes, lines, etc). >The front of the MC resevoir is being used for the front brakes. >I am not using a proporting valve, as suggested by a Wilwood tech. >Although I'll be happy to put one in if it's necessary. >I'm using the DOT5 brake fluid. > >Here's the problem. The rear brakes apparently aren't getting enough >fluid. The front brakes bled normally, and the pedal would go clear to >the floor, and I would get the expected amount of brake fluid with each >pedal push. >However, with the front caliper bleeders closed, the pedal would only >push half-way down. So, while bleeding the rear brakes, it took nearly >20-30 half pumps to get as much fluid to the rear calipes as 4-5 pumps >on the fronts. > >With the rear of the car on jack stands, the rear brakes will stop the >tires with no problem, so I know the brakes are partially working. > >I'm quite sure I have all of the air out of the lines. I bled quite a >lot, waited a week, then bled again. > >Any suggestions? I'm tempted to swap the lines at the MC and see what >happens. > > >Also, the parking brakes are not working on the Ford brakes. The lever >is being turned all the way, but nothing is happening. Any suggestions? > >BTW: This is my first experience with the 9" rears, so maybe I've >missed something. > >Thanks! > >-- >Check out my webpage at http://www.ProStreetCar.com >and my For Sale page at http://www.ProStreetCar.com/classifieds.html >Team Chevelle membership #178 (Gold) >Time Flies: "It's funny how you can watch a clock and time seems to >stand still. But turn away, and you have to measure time with a >calendar rather than a clock." mjp > >----------------------------------------------------- >To Unsubscribe please visit www.chevelles.net/list.html >To start a new topic, send mail to: [EMAIL PROTECTED] _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
