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Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
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post #1 of (permalink) Old 08-31-2000, 02:46 PM
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Master Brake

Now that is a typical german question!
........something for CJDave?

My CJ 5 from 74 with 304, has no brake servo. From Austin Healey`s or BMC Cars I know that there are sometimes brake master zylinder with differend bores (in my case smaler) for a higher brake fluid compression and more brake power. Like You all can imagine brake power is importand on the german autobahn, so please let me know what masterzylinder will fit my jeep withaout changes on the bulghead and/or if there is a easy way to fit an american style servo somewere in the use of the now standart existing brake master zylinder in the look of a 74 car.
Hope to hear from You....Thanks!
Andreas

a german jeeper in germany
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post #2 of (permalink) Old 08-31-2000, 02:53 PM
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Re: Master Brake

[img]/wwwthreads_images/icons/smile.gif[/img] Andy.....you can simply install the Jeep power-assist vacuum brake chamber just as the later Jeeps used. You can order this from the US from several different places. The master cylinder can remain the same item.[img]/wwwthreads_images/icons/smile.gif[/img]

CJDave
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post #3 of (permalink) Old 08-31-2000, 03:27 PM
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Re: Master Brake

Hi CJDave,
thanks for You quick info. I talked to a jeep parts store near Daytona Fl., they told me that the change will be difficult because the bulkhead holes are completly different. My be the salesperson just said that, because he doesn`t know what he was talking about, or again the 74 Cj5 is one more time different, so...to tell You the truth I do not know what to do or to buy, without the risk to buy something oversees get it here and find out it is not working on my car. So If You have a partnumber and a online surplier, please let me know....and I can go for it.
Again Thank You Very Much
Andy

a german jeeper in germany
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post #4 of (permalink) Old 08-31-2000, 03:32 PM
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Re: Master Brake

Andy,
The parts guy knew what he was talking about. The master cylinder on your '74 won't work with the later model booster. I tried it myself with my '75. There were a few CJ's offered with power brakes those two years, but trying to find the right parts would be difficult (as you already know). I know that you are trying to keep yours as origninal as possible, but the best thing you could do is switch those from drums out to discs.

'75 CJ5,258,T18a,4.27's,33's,On-board air,Warn 8274
post #5 of (permalink) Old 08-31-2000, 03:42 PM
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Re: Master Brake

I waswondering the same thing...what can be done to be able to make my jeep stop faster? For now everything is stock but was wondering if I can switch any parts to get betterstopping power...also eventually Ill be switching to a rear ford 8.8 but I would like to get my stopping the best possible.

[img]/wwwthreads_images/icons/cool.gif[/img]<font color=blue> Boldly going where no jeep has gone before!!</font color=blue>[img]/wwwthreads_images/icons/tongue.gif[/img]
post #6 of (permalink) Old 08-31-2000, 06:53 PM
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Re: Master Brake

[img]/wwwthreads_images/icons/smile.gif[/img] There is a brake specialist that Partsmike works with all the time, but I cannot recall his name. I could go over to the Partsmike board and find out for you later tomorrow. [img]/wwwthreads_images/icons/smile.gif[/img]

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post #7 of (permalink) Old 08-31-2000, 09:51 PM
 
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Re: Master Brake

I want to do the same thing with my 78. Thing is I can't find any parts cj7 with power brakes. I've thought about an early chevy car or maybe one of those amc pacers or something like that. ken

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post #8 of (permalink) Old 09-01-2000, 07:21 AM
 
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Re: Master Brake

You are refering to my buddy, Van, CJ-Dave ....

Vanco Power Brake Supply
9738 Atlantic Avenue South Gate, CA 90280
(323) 563 1588 [email protected]

Additionally ....
Here is a copy of a post that Parts Mike made quite some time ago that I saved ...
Hope this helps.
JAF
----------------- cut
I hope this might be the answer. When you increase the tire size on your Jeep you put higher demands on the brake system. Jeep CJ's and others that have a crowded engine compartment lack room for a real effective vacuum operated power booster therefore they use a 9" maximum unit, it does fine until you start upgrading tire size and adding 4 wheel disc brakes. To start with Jeep CJ's used a lot of 1" master cylinders, the exception being the 1977-78 CJ which used a 1 1/16" cylinder, this is the best of the units that Jeep offered. When you increase the amount of pressure needed there are a couple of ways to do it. Decrease the size of the master cylinder, this gives you more leverage, but you lose pedal height, lengthen the pedal to get more leverage or use a larger bore master cylinder with a booster that gives more "boost". This is where the Hydraboost has come in to play and I recommend it for the 4 wheel disc brake vehicles that have large tires and use the large GM single piston calipers as this allows yoiu to use the GM 1 1/4" master cylinder. Back to you, with what you have for brakes the stock power unit is fine, I would use the 1 1/16" Jeep master cylinder Bendix P/N11678. If you want a larger bore cylinder and you have disc front drum rear the GM pickup cylinder(1 1/8") for disc brake (front only) Bendix P/N11944 works well. For 4 wheel disc the Firebird master cylinder (1 1/8") Bendix P/N11745, is a good choice, the Corvette cyl P/N11749 is a smaller outside size and works well also. Mike
------------------ cut

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post #9 of (permalink) Old 09-01-2000, 08:40 AM
 
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Re: Master Brake

From a post from CJ-8/5.2Mag (I completed this upgrade recently along with 78 CJ large front discs and rear drums. Makes an huge difference):

Get a reman booster/master assembly at your local "Pep Boys" type parts house for a '68-'82 Corvette (usually $99-$140, after you turn in your Jeep booster for a core, a regular parts house with a good counterman may check that the booster core isn't the same and may not take it back!).
Order the firewall to booster braket from a '87-'94 YJ (without ABS)from the dealer (under $15) or get one from a wrecker, this fits the CJ firewall perfectly. Open up the 5/16" booster-side bracket holes slightly to fit the Corvette booster.('68-'76 boosters are std thread, 3/8"USS nuts. '77-'82 boosters have metric threads, 10MM. They are interchangeable as long as you use the matching master cylinder).
You will notice that the Corvette booster has a male 3/8" SAE fine thread rod instead of the eye that is used on the Jeep master cylinder or booster bracket rod. You will need to cut off the rod so it's about 4" long and thread it to 3/8" SAE with a die (cut off the small end of the rod that goes through the firewall if you are using the rod from the stock booster linkage). Use a connector nut available from Dorman products at your favorite parts store, or from a hardware store, for around $2.
Bolt the bracket to the firewall. Temporarily bolt the booster with the long rod attached, connect it to the brake pedal and check the pedal height. It should be about 1"-2" higher than the original power brake pedal, usually about even or slightly higher than the clutch pedal will work out perfectly. Shorten the rod slightly, if needed, to lower the pedal height. Extend by unthreading the rod out of the connector nut. Be sure that the threads go into the connector nut at least 1/2", bottomed out against the threads from the booster is best.
Once you are sure of the length, using red locktite, tighten the connector nut to the booster, and use a Jam nut on the pedal rod end for a tight connection. Install the booster to the firewall bracket, and brake pedal pin using a new cotterpin. Readjust the brake switch by pushing it against the pedal tab until the lights work properly. The brake lines swap front to rear on the master cylinder. The GM master front/rear cylinder ports are opposite of the Jeep ports but threads match the proper tubes. Bleed the brakes properly, and test drive, carefully. You will notice that the brake effort is extremly light and the Jeep stops better than it ever did stock!

The conversion works well because the dual diaphram booster, the larger (and cheaper to replace) 1 1/8" bore master cylinder, compatability with disc brakes and the added leverage from the brake pedal. The only drawback is the increased pedal height that a long legged driver may object to, but most people get used to it quickly.



'79 CJ-7
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