SLH with 87 solid rear disk Qs

[Juggy]

hey I picked up some solid rear disks so I can swap the L body to 4 wheel disk....I know 89+ is more desireable but hey, it works right?!

I was wondering if anyone else has gone this route, and what master cylinder/prop valve they used.

Ill be running the 60mm caravan calipers up front, and want to add the daytona 87 solid rear disks. thanks!

Also what is needed to keep the ebrake setup working???

Cory

[1983Rampage]

Well, I have the rear vented and front 11" brakes off of a 91 Spirit R/T and the only main difference is the 11" status and the vented brakes in comparison to your setup. But the master cylinder you need is the 24mm that is found in the all-wheel-disc cars. I know that there is a few good ones off of ebay. Prop valve should be (from what I have done) the one that came out of any solid rear disc brake car. There are enough 86 and 87 turbo z's being parted out, that is also a good way to get the master cylinder.

For the master cylinder I am not as certain, I know that with the style of rear disc brakes that I have, it has the drum style e-brakes so it attaches straight up with my old e-brake, I think that the 87 had a wedge style and I don't know much about them, which is why the 89+ are the more desirable.

By the way, what is this going onto. My setup is on an 83 Rampage (hence the name), with the components of a GLHS. I have a few ideas to help our cars out with the inevitable problem of rear wheel lock up when you slam on the brakes too hard. But more on that later. If you have more question, just ask, I would be more than happy to help fellow L-body enthusiasts. Matt

[Juggy]

car is an 87 Shelby Charger.....I had no idea that the drum style stuff was direct attachment I went ahead and bought the brakes comeplete with backing plate because it seemed like a decent deal!

I already have the master cylinder with the "4" on it from an 89 daytona shelby with rear vented disks, i never toook the prop valve because this was well b4 i really knew much about these cars.

so basically i need to know if the 89 DS master cylinder with the "4" will work good on the charger with the stock front 10.25" rotors and 60mm minivan calipers, along with the 87-88 solid rear disk setup.

I also need to figure out how to adapt the ebrake wedge style screw type to work on the L body, and then find myself a prop valve from an all wheel disk car if the stock on on my L isnt going to work well with the brakes ill be running.

[stargazer7467]

my master cylinder says "7/8" in the end of it, and has "4 wheel disk" cast i the side of the fluid jug. Came from the 89 lebaron my setup came from.

[Juggy]

Quote:

Originally Posted by stargazer7467 my master cylinder says "7/8" in the end of it, and has "4 wheel disk" cast i the side of the fluid jug. Came from the 89 lebaron my setup came from.

i always thought that one was different......the one with the 4 is a 24mm master cylinder, which is 0.945" as apposed to 0.875" or 22.22mm

[1983Rampage]

yah, the all wheel disc master cylinder will work perfectly juggy, hopefully you have the reservoir on it, that is a pain in the butt to get a hold of if you don't have it and the rear drum brake setup has a different reservoir. But for the e-brake portion, maybe if you looked at using the rear setup from an early daytona, that may work. But I really do not know, I have not looked at them for the e-brake setup.

[1983Rampage]

I forgot to add, the only difference between the stock master cylinder and the 24mm master cylinder is the amount of fluid that they push. So in other words, you could use the stock master cylinder, but you will have a push on the brakes for a further distance, plus there is more room for hazard to occur. I know that on the "SLH" how to write up, it talks about using the master cylinder out of the D50 or D150, I cant remember which, but what it did is it gave the vehicle very stiff brakes and with barely pushing on the brakes, it would become rock hard, so most people don't even think about using them and just go with the 24mm stock master cylinder because it has the "just right" feel.

Too bad you live up there in Canada Juggy. I have an extra set of rear 11" rear vented brake setup that would be a great add on for you car. I thought about putting them on my other Rampage, but I am just going to stick with the larger rear drums and the 10.25" 54mm Front. And they have the e-brake setup that would go with your current e-brake setup.

[Juggy]

yah shipping would be a PITA for that stuff!!!

ok perfect, I can use my 24mm master cylinder, and yes it still has the reservoir on it!
so I guess I just need to find myself a 4wheel disk prop valve, and then work out the ebrake cable situation....

does anyon know if the backing plates are the same for rear wheel disk cars?? maybe i can use my 87-88 backing plate, with an 89 rear brakes?

[1983Rampage]

well, the main difference between the plates is the style of e-brake systems. The later years have a "drum style" setup for the brake where the earlier had a "wedge style". For the "drum style" the backing plate is where the pads and setup attach, then the rotor has the drum part of the setup. If this sounds like your setup, then everything should work.

[1983Rampage]

In terms of the proportion valve this thread actually has some information on it that you may find interesting:

Proportion Valve question and theory

If you look, the difference between the proportion valve that is in the all-wheel-disc G-Bodies (Daytonas) and the L-Bodies (your charger) is that the G-body prop valve has a little bit higher pressure, so you could, in theory, use the valve you have in it, it is just that you will not have quite as much pressure towards the back but you should get plenty of fluid. The good side is that you will not have the common problem with rear wheel lock up with the lighter car in comparison to the Daytonas

[Juggy]

nope mine are definately the wedge style solid 87-88 type rear disks. So from what im reading the only problem with these are the ebrake being a crappy configuration....well hopefully i can make it work still.

.....so did u end up going with the stock L body proportioning valve on the rampage???

after reading that thread im thinking i need to find myself an 87-88 all wheel disk daytona proportioning valve now.

[1983Rampage]

That is what I am using. I have not seemed to have had any problems. The main difference between your Charger and my Rampage is that the rear end of my car has less weight to it. Most people have told me that it was a stupid idea to go with rear vented brakes because there is no doubt that the rear wheels would lock up. So that is when I started that thread. And from what I have looked at on the different valves, the only difference between the all-wheel-disc brake and the stock L-body, and if I remember right from the manual, the all-wheel-disc and l-body were the only vehicles that had those 2 proportion valves, but there was only about 50 or so psi difference, so with the lighter vehicles like ours, where the largest amount of the weight is in the front, the lower psi towards the back was a better idea.

[Juggy]

anyone know the weight distribution #s between a charger, and a rampage?? front/rear

yeah you definately are light in the rear, but with me having a hatchback and all, i must have close to 200 pounds more weight in the rear then you, so I might be need the extra power for stopping.....i guess I could always run it and see what happens lol

[1983Rampage]

The running that setup, for me, I am just a little crazy, so, it really doesn't bother me to do something a little different. But good luck.