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#1 |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Who's master cylinder and booster?
Do you know what vehicle this master and booster possibly came out of? Previous, previous owner installed it. The booster is approx 8-9" wide. And as you can see the booster is mounted directly to the fire wall. My brake pedal is also different. The slanted master and the truck lower in the front is a PIA when bleeding the brakes.
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1970 C10 Short Stepper with 71/72 front clip. |
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#2 |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: Who's master cylinder and booster?
Nobody?
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1970 C10 Short Stepper with 71/72 front clip. |
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#3 |
Registered User
Join Date: Oct 2013
Location: Austin, TX
Posts: 170
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Re: Who's master cylinder and booster?
This looks like the brake booster and MC that is in my '86 Fireo -- its definitely a mid-80s GM setup, out of a midsized or compact. - Ken
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#4 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,441
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Re: Who's master cylinder and booster?
I am using the same booster. It's from a late '70s or early '80s Chevy van. I wanted the booster against the firewall, because I don't like the MC hanging out almost to the front of the engine. I used the complete disc brake setup from a '76 3/4 T so I used that MC as well.
Your signature says "73-87 front suspension w/Disc". The '76 had a brake, Combination Valve mounted on the crossmember under the radiator. If you don't have the Combination valve, did they include a stand-alone proportioning valve on the rear brake line? I can see a distribution block/brake light switch in your pictures. Your signature also says, " ??? Cam". Unless you have really weak manifold vacuum, I'd loose that huge vacuum reservoir canister.
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'67 GMC 2500, 292, 4spd, AC |
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#5 | |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: Who's master cylinder and booster?
Quote:
I like the brake booster with out the braket....doesn't stick out as far, but not crazy about the MC slant nose. As far as the brake booster auxiliary vacuum tank. I didn't like the feel of the brake pedal..low vacuum driven by the ???cam, so I added it. Seems to have helped, better feel. Thanks for your input on the MC & Booster
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1970 C10 Short Stepper with 71/72 front clip. |
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#6 |
Senior Member
![]() Join Date: Apr 2008
Location: Franklinton NC
Posts: 1,309
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Re: Who's master cylinder and booster?
Looks like one from an Astro van.
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#7 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,441
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Re: Who's master cylinder and booster?
>>proportioning valve for the 73-87 was located on the front crossmember. Since mine is located below the MC <<
If you are referring to the item visible in your first picture, that isn't a proportioning valve. It isn't any kind of valve. It's a switch. That's all it is. It is there to turn ON the dash brake light indicator. If there is a hydraulic brake failure in either the front or rear brake system, that switch will turn ON the dash indicator light, if you have one. That same indicator lamp would be used for youe E-brake light. Without a proportioning valve in the system, you should be able to lock-up the rear brakes with ease. On a wet road, you should have a hard time keeping from locking up the rears. If you don't have that problem, your front disc brakes are not working properly. >> proportioning valve for the 73-87 was located on the front crossmember.<< That isn't just a proportioning valve. It has the brake light switch, plus a metering valve for the front disc brakes, plus a proportioning valve for the rear drum brakes. It is called a Combination Valve because it combines all three of those functions into one unit.
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'67 GMC 2500, 292, 4spd, AC |
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#8 | |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: Who's master cylinder and booster?
Quote:
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1970 C10 Short Stepper with 71/72 front clip. |
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#9 |
Registered User
Join Date: Apr 2010
Location: So Cal
Posts: 1,441
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Re: Who's master cylinder and booster?
This is what I see in your first picture. It is a pressure differential switch. A switch and nothing more. It is not a proportioning valve and it is not a brass combination valve that you are showing in your last post.
If you have a proportion valve, it may be somewhere in the line to the rear brakes.
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'67 GMC 2500, 292, 4spd, AC |
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#10 | |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: Who's master cylinder and booster?
Quote:
Note: I replaced the solid brake line that goes along the frame next to the engine back to the rear axle...no proportion valve found. I have not seen another inline valve. Are you saying that I'm getting equal pressure to the front and the rear brakes? Sounds like when the previous owner installed the power brake booster and front disk setup he left the drum brake "differential" switch intact and neglected to install a disc/drum P valve. I would put in a new Disc/Drum valve, but I'm considering converting the rear to disc and don't want to buy the valve twice. What P valve would you recomend for Disc/drum?
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1970 C10 Short Stepper with 71/72 front clip. Last edited by BugzC10; 03-21-2014 at 07:54 AM. |
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