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Author Topic:   master cylinder
Mr.Kwik
Dirt Forum Racer

Total posts: 87
posted March 21, 2005 06:01 PM  
Hey guys I did a search on this but didn't come up with much. So here is my question, I have a 88 firebird and am wondering if I can use the stock mastercylinder with out a booster? Our rules say no aftermarket brake pedals. What do I need to do in order to use my factory one? is it possible? Sorry I am used to using the race pedals and don't know much about the factory master cylinders.

sidebiteu259
Dirt Full Roller

Total posts: 56
posted March 21, 2005 06:14 PM  
Get the biggest bore master cylinder you can find. Like out of a dump truck an 3/8 female heim and a 2 1/2 inch 3/8 find thread bolt and you will be in business.

dm3
Dirt Full Roller

Total posts: 40
posted March 21, 2005 07:46 PM  
The simplest way is to remove the spring from inside the booster and leave the booster housing in place, but with no vacuum hooked to it. Assuming you want the booster gone, that's a little more work. You can follow sidebites instructions, the only thing I would add to it is something to keep the rod (bolt) from coming free from the master cylinder. A pedal stop or even an old piece of inner tube with a hole in it. I'll leave it to you to figure out what would work best. You might even consider cutting up the booster to make an adapter plate and using the existing rod. Bottom line - it can be done, and there are a lot of different ways to do it. Just make sure it's not gonna come loose if you hit a few bumps , cars , walls, ect lol.

o5racer
Dirt Freak

Total posts: 402
posted March 22, 2005 06:14 PM  
For god sakes dont run a dump truck master cylinder. For a stock firebird with factory front disk and rear drums you will need something in the 7/8-15/16 range. any bigger than that and it will take too much pedal pressure to stop. On the pedal you will need to move the pin for the pushrod up slightly higher on the pedal so you get more leverage. Make sure there is a solid pedal stop so that the pushrod cannot pull out of the back of the mastercylinder. Some mastercylinders have an extra deep hole drilled in the back for the pushrod. Those are even better because the rod has to pul out farther before it can fall out.
Nick

Mr.Kwik
Dirt Forum Racer

Total posts: 87
posted March 22, 2005 06:20 PM  
Ok, thanks for the reply's guys but the car I am using was new enough to have factory rear disc brakes. So will my master cylinder work? Has anyone used one of these??

[This message has been edited by Mr.Kwik (edited March 23, 2005).]

wrenchnerd
Dirt Roller

Total posts: 16
posted March 27, 2005 04:40 PM  
i use one from an 84 mustang with manual brakes in my regal, gotta do some work to make a linkage, but it brakes well, disc front, drum rears.

petordragon
Dirt Maniac

Total posts: 167
posted March 27, 2005 07:30 PM  
what is wrong with using a brake booster?

sidebiteu259
Dirt Full Roller

Total posts: 56
posted March 27, 2005 08:38 PM  
Its Heavy O but wait you are adding a billzilion pounds on the back any way to get "percentages"

BCracing
Dirt Full Roller

Total posts: 32
posted March 27, 2005 08:46 PM  
all that I do is pull the booster off, take the rod that went from the brake pedle to the booster out of it, bolt the master cyl. (the same one that I just took off the car) bolt it back on where the booster used to be (will have to drill holes in between the four holes that were there for the booster) and cut the rod to fit the master cyl. I have had no problems with this setup

    

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