Is this a brake booster? - JeepForum.com

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post #1 of 17 Old 01-05-2012, 04:35 PM Thread Starter
stephenxchen
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Is this a brake booster?

Hi guys,

I recently bought a 1964 CJ5.

Can someone please tell me what this part is? PO told me it was a booster, but I Googled around trying to find a replacement/repair kit, but I haven't seen one picture similar to this.

It is mounted on the driver side fender, next to the radiator.

Also, please let me know how to replace/repair this thing.

Thanks in advance.



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post #2 of 17 Old 01-05-2012, 04:37 PM Thread Starter
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post #3 of 17 Old 01-05-2012, 04:51 PM
Noplainsdrifter
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That's very interesting? Is there a master cylinder on the firewall? It almost looks like it could be part of propane system? Just guessing though.

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post #4 of 17 Old 01-05-2012, 05:08 PM
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I see what might be a regulator of some sort to support Drifter's idea. Does it connect to the brakes in anyway, for it to be a brake booster I would think that it has to attach to the master. Either way, I suspect you rebuild/repair by removing that center band clamp, separating the halves and there is probably a rubber diaphram in there that has gone bad.

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post #5 of 17 Old 01-05-2012, 05:08 PM
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post #6 of 17 Old 01-05-2012, 05:13 PM
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Yes, that is a brake booster. it is called a Hydrovac. It was a common vac booster for 50's and 60's medium duty trucks. As of a few years ago you could still get them rebuilt and new. I used to put them on my 1 ton and up trucks.
think of it as a vac booster that goes inline after the master cylinder. generally they were frame mounted under the cab. the fitting you have highlighted is for the vacuum source. those boosters usually had multiple places to choose from to run the vacuum line into it
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post #7 of 17 Old 01-05-2012, 05:15 PM
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That is an old in line booster. It boosts the fluid itself. I have seen a couple on early IH Travelalls. The biggest problem I have with them (besides being entirely obsolete) is they only work on single master cylinders. My first upgrade to any CJ is a switch to a dual unit, which is MUCH safer.
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post #8 of 17 Old 01-05-2012, 05:15 PM
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Care to clarify how it works? I guess I have heard the term but never meshed with one.

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post #9 of 17 Old 01-05-2012, 06:01 PM
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They work pretty much the same as the more modern version. Jeep daddy is right they are used on the single line MC systems. Fluid pressure from the master cylinder is sensed by the control valve (the small diaphragm). and boosted accordingly to the output side of the cylinder (the end with 2 fittings) one to the rear and one to the front. When the first dual chamber masters came out they used dual versions of these very briefly. They were used on mostly 1 ton to 5 tons, bigger than that it was air brakes. Imagine trying to stop a 1959 F600 with 15X4 inch rear brakes and 15X2 inch fronts with out power assist. This is what they had and it worked great. My F600 stopped on a dime.
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post #10 of 17 Old 01-05-2012, 06:11 PM
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Thank you, I take it it is still vacuum operated with a diaphram?

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post #11 of 17 Old 01-05-2012, 08:43 PM
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yes the diaphragm is in the big can/chamber.
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post #12 of 17 Old 01-05-2012, 11:10 PM Thread Starter
stephenxchen
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Thanks guys for sharing your knowledge on this.

Currently it is not connected to anything, and while driving, I almost have to put all my weight on the paddle to make it stop, the brake is very stiff.


Questions:

1. is it original? if not, WHAT was the original booster like?
2. What would you recommend in terms of a replacement? (what to buy, how difficult to put in, etc.?)

Thanks
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post #13 of 17 Old 01-05-2012, 11:42 PM
titomars
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I have never seen one in a jeep before. Personally I don't think jeeps need it.
You say its not hooked up. But I see brake lines running into the unit. if your hydraulics are still tied to that booster and its not hooked up to a vac source the brakes will be very hard. The fluid has to manually pass through all the valving. Get the brakes off the booster entirely and it should stop better. I suspect the booster is leaking vacuum that is why its disconnected.
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post #14 of 17 Old 01-06-2012, 08:14 AM
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Quote:
Originally Posted by stephenxchen View Post
Questions:

1. is it original? if not, WHAT was the original booster like?
2. What would you recommend in terms of a replacement? (what to buy, how difficult to put in, etc.?)

Thanks
1. No. There was no booster originally. Your Jeep had manual brakes, with the master cylinder located on the frame under the pedal (through the floor pedals, not hanging like later Jeeps).

2. You can upgrade with parts from Herm the Overdrive Guy: http://www.hermtheoverdriveguy.com/id27.htm
http://www.hermtheoverdriveguy.com/id2.htm

That still won't get you power brakes (to do that you'd have to convert to hanging pedals and mount a firewall mounted brake booster). But it will modernize your braking system and improve it enormously.
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post #15 of 17 Old 01-06-2012, 08:18 AM
Noplainsdrifter
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Wow! I guess I'm not as old as I thought I was, I've never seen a booster like that. Now I'm smarter and just a tad bid older!

Good info all!

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