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flyhilandsoft
Post subject: BMW 850 Brake Booster  PostPosted: Jan 24, 2014 - 04:12 AM
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Joined: May 12, 2007
Posts: 330

I am currently installing the clutch and brake pedal for my Countach. As some of you may know I am trying to use as many components from my donor car the BMW 850CI as possible. I have begun digging through all of the parts that I removed over 5 years ago searching high and low for the Brake Booster and Master Cylinder. I found the master cylinder but came to the conclusion that the car must not have had a brake booster because I cant find it. I looked at some pictures online to see if I was missing something but it would be buried under the dash if it had one because I don't see one in any pictures. Like all modern cars the BMW 850CI came with antilock brakes and lots of components for that system. All the G-wiz stuff is not going to work for obvious reasons...... so should I scrap the brake components and select a better alternative or can I work with what I have? I know many of you have used the M70 and also used the 750 as a donor and wonder what you have all done with this setup.

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John
Goodyear, Az
"Its a dry heat"

http://www.siennacountach.net/gallery2/album129?page=1

http://countachbuild.shutterfly.com/pictures#:albumId=2303
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flyhilandsoft
Post subject: RE: BMW 850 Brake Booster  PostPosted: Jan 24, 2014 - 05:42 AM
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Joined: May 12, 2007
Posts: 330

I didn't know to much about the Hydraulic Brake Booster setup so I have been doing some research tonight and looking at some parts diagrams which shows that the hydraulic booster setup operates from the power steering pump. I went back out to the garage and located the hydraulic booster however it is connected to the ABS unit and will obviously not work for my car. Can I disconnect all of the ABS and still be able to get the brake system to work properly? I might add that I am also using Corvette C4 calipers.

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John
Goodyear, Az
"Its a dry heat"

http://www.siennacountach.net/gallery2/album129?page=1

http://countachbuild.shutterfly.com/pictures#:albumId=2303
Password-aluminum
 
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daywilmOffline
Post subject:   PostPosted: Jan 24, 2014 - 06:30 PM
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Joined: Nov 22, 2009
Posts: 274
Location: Tulsa, Oklahoma
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First reply didn't seem to take so i'll try again. I'm using a similar setup (BMW v12 with C5 Corvette calipers) and have eliminated the hydraulic power booster in favor of a more conventional vacuum assist. If I remember correctly, I using a master cylinder/booster from a Chevy Astro or Ford Windstar. One of these has the split reservoir with the front reservoir lower than the back. This gives you the clearance you need for the front compartment lid. Do a search on "brake booster" or something similar and you should find lots of information on this site.
 
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lambo1Offline
Post subject:   PostPosted: Jan 24, 2014 - 10:15 PM
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Joined: May 14, 2005
Posts: 167

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Guys I am also trying to decide, weather to use the 750 1988 master that's on one of my donors, I originally started with a Toyota Soarer as my donor, but soon discovered there is not much room around the pedal box / suspension space so started looking at my 750 donor, it has the master cycl run from the power steer and seems to work real good in the BMW, I did view another countach replica last weekend and he used 2 brake cyl ie front and rear separate, hooked up to a remote PBR vh44 I think it is, there were two models of this made years ago one for disc and one for drum, not totally sure of the numbers, but my dad fitted one to a Ford falcon 40yrs ago and it had the best brakes ever.
I did take photos of the Countach but cant find a way to post them here. This site really needs to have an easy way to post pics.
 
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AdrianBurtonOffline
Post subject:   PostPosted: Jan 27, 2014 - 03:09 PM
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Joined: Jul 22, 2003
Posts: 1749
Location: Mooresville, NC
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I am using Wilwood brake pedals and master cylinders, no need for boosters, and you get a better feel from them

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flyhilandsoft
Post subject:   PostPosted: Jan 29, 2014 - 04:06 AM
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Joined: May 12, 2007
Posts: 330

Thanks for the info guys. I am going for it. I think it is going to work well. It should because everything will be OEM. I have plenty of room for the master cylinder but I may have to offset the clutch master cylinder to the opposite side of the brake master cylinder. That will be a simple task. I am installing the windshield wiper assembly today and only had to modify it slightly. It seems it was almost made for the car. I had to only lengthen the rod the wiper arm connects to which allows the assembly to be lowered slightly so as not to interfere with the tubing in the chassis. I had to keep the upper portion of the rod spline because I couldn't duplicate it and turned the opposite end down in my lathe then mated it to another rod I drilled out in my lathe for a perfect match. I am very happy with the results and just need to fabricate some brackets to mount the wiper assembly. Now with it in place I will continue ahead with mounting the master cylinder. I hope I can upload some pictures soon.


AdrianBurton wrote:
I am using Wilwood brake pedals and master cylinders, no need for boosters, and you get a better feel from them


I was leaning that way initially and even had my setup picked out on there website I decided to keep the OEM equipment and believe that it will work well. I like the Willwood idea however.

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John
Goodyear, Az
"Its a dry heat"

http://www.siennacountach.net/gallery2/album129?page=1

http://countachbuild.shutterfly.com/pictures#:albumId=2303
Password-aluminum
 
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