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Author Topic:   What the heck is this? brake/power steering related
dode
Member
posted August 26, 2002 09:02 AM
We have a buick grand national that we are building for our dirt track car for next year and it has some sort of crazy unit between the firewall and the master cylinder. I had no clue what it was, but happened upon another buick when I was at the junk yard, and it was plumbed in line with the power steering pump and box. It had a line plumbed from the powersteering resevoir to this unit. Then it had a line from the unit to the back of the power steering pump. The power steering pump went to the steering box, and the steering box plumbed up to this unit to close the circuit. Can anyone tell me what the heck this thing is? Thanks.

John

istock59
Member
posted August 26, 2002 09:29 AM
Power assist for the brakes, instead of vacuum. Used with lots of diesel cars, since they don't have as much vacuum. I had a diesel Blazer that had the exact same setup.



dode
Member
posted August 26, 2002 09:31 AM
Hmmm...now that is interesting. So it uses the power steering pump for pressure to assist the brakes? Makes sense since it is a turbo car. Should I try this, or just dump it and go with a manual or vaccuum brake setup?

John

UFnARacing
Member
posted August 26, 2002 10:45 AM
As a very proud owner of a GN, I'm both upset and interested about what your going to do to this car. My car only has 30K miles, I'm sure the one your using has way more than that. But, to my point, the braking system on these cars are junk, absolutely junk. You'd be saving time, money and a lot of aggravation by converting it NOW. Don't even mess witht the stock system.

So what motor are you going to be using? If you need any info on what options these cars came with let me know, I've got lots of info on them.

Randy

dode
Member
posted August 26, 2002 11:39 AM
I am very well aware of what GN's are. They are sweet cars, even for GM's. Basically what I have is a shell. I bought it from a local GN enthusiast who used it for a parts car. He has like 3 of them I believe that are good cars, but he said this one was worth more in parts. I bought the frame with front suspension, and the whole body from the firewall back for $100. The body and frame are VERY solid, and not a single rust hole in it, so I am happy. Anyway, exactly how on earth do those brakes work anyway? What would be a good choice to replace it with? I have a brand new master cylinder and booster from a 71 chevelle. Would that work?

As for with the car, it will be home to a 350, a saginaw 3 speed, and a Ford 9". Well, that is if I can find a 9" that would make a suitable donor to use. I have no rear end for the car right now, but I think I am going to go to the local U-pick-it place and get a 10 bolt just to throw in there for now. Is there any particular one that would work better than any others? I know there are 7.5 and 8.5" models, but I don't if they were all the same in the metrics or what. I know the car was originally equipped with a 12 bolt. That is long gone though.

John

racer17j
Member
posted August 26, 2002 11:49 AM
my first car was a metric cutlas deilse and that what it had on it that was the first thing to go.get rid of all of it find a metric anything that had a 305 in it and take the pump and lines off it i got mine off a caprice . makes for alot less headache and searching for mounting brackets and fittings that won't leak all the time if you go that way. also take the brake booster or if you want manual brakes go with a late 60's early 70's truck master cylender. you could try to run what you have now but the pump won't mount right and then it is alot heavier than other setups and you have more fittings and lines to get torn off and leak all over the place. as for your rear end just find another mtric car look for something that had a v6 in it they usually have better gears for racing in them i had a cutlas that had a v6 had a 3.23. or if you can find somebody to jig it up for you a 70's nova with a 8.5 is a better choice and is the right width. or another option that would give you the best range of gear choices is a 12 bolt out of a 68-72 chevelle. thats what i'm going to get for next year so i can go to a final drive of 5.86 instread of getting the ratio thru the tranny all the time

[This message has been edited by racer17j (edited August 26, 2002).]

dode
Member
posted August 26, 2002 11:56 AM
Well I was only asking because the pump and master cylinder and everything are still on the car. Can I just use that master cylinder with a vacuum booster, or should I replace it all? Thanks.

John

racer17j
Member
posted August 26, 2002 12:09 PM
not sure if you can do that or not but myself it's alot less work to just pelace the whole thing it's just 4 bolts two fittings and a clip if you do it that way


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