Anyone

Do any of you all have the CPP MCPV-1 master cylinder? Nice setup? Hard to install? Any issues?

My trucks pretty much completely done obviously with exception of my brakes. Had to take off a brake line to work on a leaky tranny and I prob don't have some fittings quite tight and it looked like my master cylinder was leaking. Can't be totally sure

But I like the idea of the MCPV and just running straight to the brakes without putting in the residual valves and multiple connections.

I have a TCI under cab frame mounted brake booster master cylinder currently. I would think this would hookup. I'll call and verify today.

Thanks Everyone

Patrick

 

yes, I am running the CPP MCPV-1. I have both the polished and chrome ones.

the chrome one came with a remote fill cap for under floor locations. My only wish was that the cover would be blank instead of the BIG CPP.. but I understand their need to advertise. it also has a port for a pressure activated brake light switch. (ugly on the firewall!)..
the built in prop valve is why I picked it.

Sam

 

Yeah, Im with you Sam I like the "all in one" feature and its supposed to be really good. And I agree, they must advertise, but it should be an option to get a plain cover. Oh well. Im calling and ordering it. Thanks Dude!!!!

Patrick

 

If it's under the floor, how do you get away without resiual valves?

 

no drum brakes?

sam

 

I have disc on front and drum in rear. Here is the excerpt from CPP on the Master Cylinder. Doesnt look like you need any residual valves to me because the MPCV-1 does that already. I could be wrong, but pretty sure its doing the same thing. Plus when I talked to Mario at CPP Tech line to make sure what I needed was correct, he didnt mention any residual valves. I needed the 1" bore because my TCI Booster is approx 4" wide, which means single diaphragm.

Im sure someone can clarify on the residual valves beings this is located under the frame......?????


After years of developing unique brake products, Classic Performance has developed their most innovative product yet. The all NEW MCPV-1 which combines the master cylinder, double adjustable proportioning valve, removable metering valve and stop light control all in one compact light weight unit, available for Disc/Drum or Disc/Disc applications. The MCPV-1 solves many problems associated with trying to do the same thing with four or five separate pieces being plumed together. The MCPV-1 is the master cylinder, proportioning valve, metering valve and stop light all in one package. The unique shape allows it be located on the firewall, under dash or on the frame just about anywhere. It’s approximately the same size as the ever-popular Corvette master cylinder...only 260% lighter.

The MCPV-1 has two circuits...front and rear. The front circuit of the MCPV-1 contains the metering valve, which is required on cars that have disc brakes on the front wheels and drum brakes on the rear wheels. The metering valve does not allow any pressure to the disc brakes until a threshold pressure has been reached. The threshold pressure is low compared to the maximum pressure in the braking system, so the drum brakes just barely engage before the disc brakes kick in. Having the rear brakes engage before the front brakes provides a lot more stability during braking. Applying the rear brakes first helps keep the car in a straight line.

The rear circuit of the MCPV-1 contains the adjustable proportioning valve and the maximum rear pressure adjustment. The adjustable proportioning valve controls the balance of pressure between the front and rear brakes. For example, if the adjustable proportioning valve was set to 70 percent and the brake pressure was 1000psi, the front brake would get 1000psi and the rear brakes would get 700psi, regardless of what type of brakes a car has. The Maximum Rear Pressure Adjustment controls the maximum rear pressure allowed to the rear brakes to help prevent rear wheel lock up. If the Max Rear Pressure Adjustment is set to 500psi and the adjustable valve set at 70 percent, the front brakes get 30 percent more until the rear reaches 500psi

 

I was wrong. Just talked to CPP Tech support and asked.

I DO NEED the Residual valves in there. 10 lb in Drums and 2 lb in Disc. Thought I was gonna get away without them with the new Master. Guess not.

Patrick

 

Yeah, I thought so, otherwise the pistons retract too far, giving a long pedal travel. With discs it would be a little less noticable, but still there. It's not a big deal, they fit inside the ports on the MC, you can't see them from outside.

 

hm.. never seen any that fit IN the master brake line ports.. only the inline add on versions..

ECI Hot Rod Brakes and Brackets Brake Facts - nice pics of the setup both all disc and disc/drum

SSBC Residual Brake Pressure Valve

Sam

 

On the stock MC they are little disc-looking things that press in onto the flare seat. I don't know why the new MC's wouldn't use them.