just worked out the bugs last weekend. Had a problem getting all the air out of the system.Could not get full peddle and they would pump up. Here's what I found, with the kit both brake calipers sit slightly forward of the original Elderado Cadillac mounting position, So even though the Bleeder is on top it slightly points downward, so there is air that stays traped in the Caliper piston bore at the top. You have to unbolt the caliper mounts and roll the caliper back so the bleeder faces up more. This allows you to get rid of the air. With work and other side jobs it took a long time to complete the conversion. Ill post a pic soon. Have to say i'm glad I did it. Awsome stopping power and a real cool look.
I used the master cyl. from a 1976 Cad Eldo (disc/disc) on my conversion. The Eldo originally had a hydroboost (?) unit, but I don't think that affected the MC. Rebuilt MC was cheap at the local auto parts store. Here's some food for thought from the Master Power Brakes website: Rear Disc Brakes If you are using Cadillac ElDorado rear calipers there are some important things you should know. One of the biggest advantages of a disc brake system is the fool proof self adjuster. Not so with this rear GM system. The rear calipers adjust off the parking brake. The parking brake is incorporated into the caliper. You must set the parking brake every time you park the car. The rear caliper pistons utilize a one way clutch inside the caliper piston. When the parking brake is applied the clutch senses when there is .030" or more clearance between the friction material and the rotor on the inboard side. When there is more than .030" the clutch turns inside the piston adjusting it out keeping the rear brakes adjusted. If you do not set your parking brake every time you will start to lose brake pedal (low and spongy) and the adjuster mechanism will not work any longer. DISC / DRUM MC A disc / drum master is designed to push more fluid volume to the front disc brakes since disc brakes require more volume than drum brakes. Generally speaking a disc / drum master will have one fluid reservoir larger than the other.This is because the disc brake pads wear faster than the drum shoes and the fluid reservoir will drop faster. Original disc / drum masters had a built in residual pressure valve to the rear drum brakes only. Never reverse the outlets on a disc / drum master. Doing this will cause the front disc brakes to drag excessively from the residual pressure valve. DISC / DISC MC A four wheel disc brake master cylinder is designed to supply more fluid pressure and volume to the rear disc brakes than the disc / drum master does. This is acheived through an internal piston re design. The piston that feeds the rear brakes on a disc / drum master will run out of stroke, limiting the amount of fluid pressure and volume that may be supplied to the rear isc brakes. The four wheel disc master redesign delivers the extra needed volume and pressure to the rear allowing your rear disc brakes to function properly. If you attempt to use a disc/drum master on a four wheel disc system you will get poor rear brake function and experience a spongy brake pedal with a long pedal travel.
Thanks for the info, But I've test drove it and the brake peddle is great. Also when starting the project TSM Tec. support said with the recomended caliper I am using would be no problem, Which was confirmed by above member {GStage1} George Nenadvoich, Buick Performance founder. {alot of great info on everything at his site} Also you are correct about actuating the park brake. Most every day drivers that had this brake set up {rear integral park brakes} dont use, or dont know that using the park brake keeps the adjustment up. I have shown many customers this in the past. On another note several vendors do offer a 4 wheel disc proportion or combination valve depending on your vehicle. For now I willl drive the car and move on to the next project. But I will monitor disc pad wear and stoping performance on different road conditions to see what happens. let you know down the road how it does.
