Is a gm - gbody kinda master cylinder backwards from most aftermarket master cylinders?
Here's how my truck was plumbed. The 1/4" tube farthest from the firewall is going to the rear of the proportion valve. Is that correct for this master cylinder and proportion valve? When I look up pictures online seems to be consistant. Although can find good pics to really confirm other than they seem to always have the 1/4" line in the resevoir farther from the firewall.
I grabbed Hemi/Atomsplitters master cylinder because it has a straight resevoir. (I'm pretty confident this master cylinder/booster is suppose to be mounted on an angle, so figured swapping master cylinders would be easier fix than trying to get the booster on an angle, needs way too much shim to just shim the bottom). But when I look up Hemi's master cylinder online it showed the tube farthest from the firewall going into the front section of the proportion valve.
Why are these opposite?
I wanted to make sure I don't plumb hemi's master cylinder backwards....
The larger resevoir on this master cylinder is at the back (closest to the firewall) and that should be the one feeding the front disc correct? And the smaller resevoir to the rear? The problem I don't like is because of this being mounted straight and not on the angle, it won't hold the proper amount of fluid which is why I'm looking at fixing this. So to me this sort of suggest that the gm one in this case is backwards..... Is that logic correct?
Not really answering your question but.. That looks like a GM M/C you have if the brakes are working good then why not look for a level reservoir that would fit on the M/C . That would save having to bleed the lines too.I'm not sure if they are available but if so it would be a lot less work.
Was chatting with someone about that. Seeing if I can find a level resevior off another gm m/c and swap but I dunno how easy that's gonna be to find. I think the current M/C may have sucked in some air anyways when the larger resevoir got low so I think I'm bleeding everything again anyways. But I'm also not happy with the brakes anyways, they stop ok, but I still don't feel like they stop as well as they should/could.
The largest reservoir should be for the disc brakes and the small one is for drum brakes.. That master cyl is not correct for your vehicle.. I have seen that master cyl before and I think I have only seen that on a couple year vans.. but I am not sure.. But that angle would leave you without much fluid for those caliper pistons..Do you know what that master cyl is out of you need to know what the application is to figure the correct plumbing..
Master cylinder designs vary from one model or manufacturer to another, and many have the front outlet going to the rear brakes and the rear to the front, while others have the opposite arrangement. Many dual outlet master cylinders will have a built in proportion to them. It is imperative that the installer knows what master cylinder he has and how it was intended to be plumbed.
-- Edited by admin on Friday 3rd of June 2016 04:42:58 PM
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Again with putting chev crap on that poor old beautiful ford truck , not bad enough that it is
chev crap ,but a used master cylinder. You deserve to have it start leaking 3 weeks after you put it on
and have to start searching the internet to figure out what vehicle it came off !!
Master are cheap!!! If you must use a chev one go on rock auto and look at something from the sixties or seventies
and an adjustable proportioning valve . Personally I would be looking at something similar to your truck.
72 CHEV half ton if you must put chev parts on it , or even a 70 ford half ton !!!
but I would use NEW
I didn't buy a used master cylinder. It was a brand new and it's a 1980 monte carlo. That's what was in the truck when I got it. When the original one in the truck started leaking previously - I just replaced what was already there. But I have a problem with the angle and for some reason this brand new one is leaking out the cap.
Now I wanna start making it right. It's a gbody front clip with a 350 g body rear end Everything is 1980 monte carlo I believe. I know how much it upsets you Joe lol but that's what I bought, and that's what I'm working with.
The largest reservoir should be for the disc brakes and the small one is for drum brakes.. That master cyl is not correct for your vehicle.. I have seen that master cyl before and I think I have only seen that on a couple year vans.. but I am not sure.. But that angle would leave you without much fluid for those caliper pistons..Do you know what that master cyl is out of you need to know what the application is to figure the correct plumbing..
Master cylinder designs vary from one model or manufacturer to another, and many have the front outlet going to the rear brakes and the rear to the front, while others have the opposite arrangement. Many dual outlet master cylinders will have a built in proportion to them. It is imperative that the installer knows what master cylinder he has and how it was intended to be plumbed.
Beans: I am suggesting you get rid of that master and find one from an 83/84 S10 or Buick regal.. I believe the bolt pattern for your booster should be the same and it will sit level So you can fill the reservoirs.. It's hard to tell from here but that cyl as I view it from here will never work properly on your truck with that angle. I am pretty sure the S10 will bolt up in there and work. Too bad somebody wasn't down this way for the Plunket show this week-end I have a few of them here I could send down for you to try and match to the booster.. I am pretty confident the S10 will do the job for you but there are always surprises that we didn't count on. Be extremely careful with brake fluid on any painted surface , body, frame, inner fender brake fluid is extremely corrosive ,it will eat the paint off anything it touches..Try to check the S10 if you know anybody with a truck or if there is a recycle yard you can get access to..I can't see how that master cyl ever worked correctly on you truck if it has been on that angle and incorrectly plumbed..My all data does not go back to 80 so I was not able to get a explode view of the plumbing ..I will check a coupe other sources and see if I can find any more info.. I know I have one here in the barn....
One after thought .. You could go to Rock Auto and find both the slanted one you now have and an S10 or Buick mid 85 models they have excellent pictures of the parts and sometimes measurements..
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It really doesn't upset me, I still sleep fine at night ,knowing you have a chev engine in it LOL.
I would at very least put an adjustable proportioning valve in the system or a proportioning valve out of a pick up .
A car and truck are very different as far as front and rear weight and how the weight transfers under braking.
Trucks are light in the rear meaning more front pressure is required to stop. A car proportioning valve is set up very different than a truck proportioning valve
Also I am betting your truck weighs in at about 4200 lbs and a g body monte carlo weighs in at about 3500 lbs
You already stated that the brake system wasn't up to your expectations , There is a reason why most things are built
heavier on a truck than a car . I would be at least looking at stuff made for a truck
Good night now
Joe
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