Corvette Master Cylinder?????

[Degnol]

I want a master for 4wheel disc brakes. This master is manual, like non-boosted and is used by some, at least. What I'd like to know is,...does using this master cylinder eliminate the need for a proportioning valve?
I posted this question on POR and was rebuffed, I guess. Actually never knew I was buffed, let alone REbuffed. Anyway, no replies.
There have been some posts on the '75 Corvette manual master and I just want to know if anyone is running it with 4wheel discs and IF they have to use a proportioning valve.
Assuming LC calipers in front and Monte calipers/GM rotors in back.
Thanks,
Ed

 

[dd113]

I would hook it up with a proportioning valve just cuz. There are many variables that may or may not require the need for it. A Wildwood is only around $50. Put it in and adj as needed.

No replies on POR? Got a star? Then why make the crappy comment about POR? I stand corrected on the previous comment. You got a star. But i think your IH8MUD coment was correct.

No one has a line on how disk brakes work on all trucks. Put in the proportioning valve as a matter of course. If you dont need it then you have it in line for the next brake mod you make.

 

[Advent]

No one has a line on how disk brakes work on all trucks. Put in the proportioning valve as a matter of course. If you dont need it then you have it in line for the next brake mod you make.

Definately. Not to mention, you can adjust based upon both wear and conditions. I personally adjust my proportioning valve differently in the summer versus the winter, because the rear is much, much more likely to lock up on ice. It gives me the best control of brakes in any conditions.

Also, if you switch to the Corvette master cylinder...Aren't you going to a whole heck of a lot of work to avoid doing just a little?

 

[1969cruzer]

master cylinder

i heard a 1 ton chevy master cylinder works very well, you will need to fab up a mounting plate for it though.


good luck

 

[mallred]

I used the corvette mc on my 40 after the mini disc conversion and still have the drum rears and used the minis p valve and it works great. At the time I was worried about having a boosted mc and stalling the engine and having no brakes, Since then I have read posts that some have used a 12 vlt vaccum pump to avoid this problem with power brakes. This is probbaly use on the 45 as I have 78 running gear going under my 45.

 

[Degnol]

DAVID!!! I was not knocking POR, those guys have been real nice to me! They even tolerate dumbass questions, if asked in a somewhat apologetic manner. I was just trying to make the joke.
I used to spend most of my time on MUD, but my Bowser AOL browser won't let me sign on, well I log in, it says thanks Degnol, but I'm still not logged in. Anyway I think that although I'm not hardcore, a MC mod like the one I'm suggesting is appropriate on either board.
I appreciate all the advice I've gotten here and POR, and hope I've been able to contribute, up to my ability, so no offense to anyone here or on Pirate.
You guys have convinced me to use a proportioning valve, so that's done.
I'll let you know how it turns out.
Thanks,
Ed

 

[ian]

Curious how you guys mounted the MC.

I was considering having a conversion plate fabricated so I don't have to modify the firewall.. three studs on one side (firewall side), two on the other (corvette master side), and a hole in the middle for the push rod. Anyone forsee a problem with this approach? Only thing I can think of is the push rod length. Was also thinking about adding bracket to the plate so I can mount proportioning valve to it.

Other option would be to drill two new holes in the firewall and add a plate to inside of firewall to avoid tear out. Having 5 holes around the center makes me a bit nervous.

 

[Degnol]

Ian, Mike Smythe (Spaceghost) has a great article in the tech section on a S-10 master swap. He made a simple plate adapter, like you describe. That's what I'm going to do.

Ed

 

[ian]

I spent a good half hour talking w/ Mike about the S-10 conversion and he had some problems with it. He told me not to bother and to do a firewall swap instead. He has since replaced the S-10 setup with a full wilwood pedal / master assembly.

 

[tradarcher]

http://www.jtoutfitters.com/product/DBMC1

I used this master ( 93' Landcruiser - they had 4 wheel disc brakes with this master cylinder without a proportioning valve) with a disc brake conversion on fj62. A direct bolt-on. It also, has a large 1" cylinder, which pushes more fluid. To date it works great. I picked one up a a savage yard $40. Make sure it looks like the one in the link to JT Outfitters, with the both lines coming out the side.

 

[ian]

We're looking at the Corvette MC because it was designed to work _without_ a _booster_. I don't care about whether I'll be needing a propotioning valve or not. In the grand scheme of things, they're cheap and well.. very handy.

 

[ian]

And for those who missed it.. The Corvette MC was also discussed in a recent thread on [thread=23163]adding power brakes[/thread]. Great pics and info posted by trw.

 

[petescoffee]

The corvette master cylinder with booster is How BTB set up is sold for the 4 wheel disc.
With the stock 1975 booster I added JTO's MAster Cylinder for 4 wheel disc (which I think is out of a T100 or 98 or so LC) and have had no issues and I do not have the proortioning valve.
Just my $.02

 

[HI^C]

supra master anyone but its power.


disc drum master works, just pull the residual vavle for the drums (if it has one) and run it.