Well I installed the CPP bracket for the dual master cylinder and I plumbed the it with the help of a friend. Upon reflection to the instruction sheet after we were all finished it appears we may have hooked it up wrong. Is the big resivour for the rear and little resivour for the front brakes? We have the resivour that is closest to the mounting flange going (large) to the front brakes and the CPP sheet shows the resivour (smallest) that is fartherest from the mounting flange going to the front brakes. My friend swears we have it right based on his corvette knowledge and I think the CPP picture is right. So I'm asking for some help to settle the dilema. I sent an email to the MC people at CARDONE website but never got an answer. I read their MC installation instructions for a clue but it just said disconnect old MC / install new MC. I guess with factory installed fittings of different sizes it couldn't be confused but when you make the lines like we did we might have it wrong. If you can tell me which goes where I'd appreciate it.
Wrong Master Cylinder? Okay, I guess I have the wrong master cylinder too!. I have drums all around so I have another problem.
Usually the front res. (when mounted normally on the firewall) is for the front brakes. I have been told by a brake specialist that it doesn't matter, but I cannot verify this.
The reason for the larger area in the reservoir is because when the pads wear on disc brakes the pistons in the calipers do not return all of the way in and the fluid takes up this area. And disc/drum master cylinders have a residual valve in disc brake side, this keeps around 5 lbs of pressure on the discs so the piston doesn't return. If the piston was to return after the pads wore the pedal would be going further to the floor to stop you. On the drum side as the shoes wear the brake shoe adjusters keeps the shoes where they need to be.
power brake if you used http://www.classicperform.com/Store/1947_59_Trucks/4754BBD.htm ? Bought mine from www.mpbrakes.com part# MC390360P and Steve gave me lot of tips to install. Better service than CPP I used it and had a lot of trouble. output near booster is for rear!!!, other for front. Use the residual valves, is important for air flow out. I have 4 drums and works fine. Important is the space between the MC and the booster. I took lot of time to find the error. - too small space between the units. If you get a complete unit take it apart adjust new and then together. I read at the internet about this problem. Found out i'm not alone with the problem and all people they adjusted the unit are happy. Pressed the pedal 3 times and my brakes are tight and hot after a short trip with the new system. The Reason: My rod is long and the temperature of the muffler makes the rod little bit longer. the rod pressed to the booster and the shoes are on the drum. After readjust the booster it works very fine.
Larger compartment is for the discs because as the pads wear the pistons in the calipers don't return all the way in and the extra fluid is needed to make up for this. A disc m/c has a residual valve to keep around 5 lbs of pressure on the discs this is what keeps them from returning all the way in.
Beware! The larger compartment is for the disc brakes, thats correct, but beware with the residual valve. In most applications, you have the residual valve in your drum brakes, as the brakes shoes would need more fluid, to "travel" from resting point, to the drum. This would cause a low pedal, which is something you don´t want. I just found a website, where you can read about brakes and their valves: http://www.thebrakeman.com/valvetechi Found it very helpful
Whoa Brakes Okay guys, lots of info and frome it I realized I had purchased the wrong master cylinder as I don't have disk brakes. I went to FLAPS and got a Mater for a 70 chevy half ton which had all drums and I installed it. Both chambers are the same size so I don't have to worry which is which, Thanks for all the learning curve.
