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06-17-2007, 01:04 PM
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#1 |
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Registered User
Join Date: Mar 2007
Location: Nashville
Posts: 62
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Manual to Power Brake conversion
Hello all,
I'm going to convert my manual brakes to power using a complete assembly off 79 Donor. I don't plan on using the old MC so my question is, what is this? (see picture) so I have to use it? Can I eliminate it all together? Thanks in advance |
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06-17-2007, 01:53 PM
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#2 |
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Registered User
Join Date: Jun 2007
Location: Saskatoon, Saskatchewan,:
Posts: 2,901
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Re: Manual to Power Brake conversion
that is your proportioning valve. adjusts pressure for front and rear brakes. if you have discs in front and drums in rear it adjusts them for their certain pressure. if you are using the complete assembly from your donor truck, booster, cylinder and valve you will be fine b/c it has discs/drums also. Good luck
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06-17-2007, 03:33 PM
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#3 |
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Junior Member
Join Date: May 2006
Location: W-S, NC
Posts: 211
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Re: Manual to Power Brake conversion
RM72chevy,
That is called a combo ( short for combination ) valve because it also contains the switch for the brake failure warning light. Not a good thing to take off your truck. If you do not like seeing the valve there, you might consider mounting it on the front frame cross member under the radiator like the factory did in my '81 and '86. BTW, welcome to the board nuke1! HTH,
__________________
Have fun, Don Last edited by dh81k30; 06-17-2007 at 03:40 PM. Reason: Welcome |
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06-17-2007, 04:24 PM
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#4 |
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Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: Manual to Power Brake conversion
both of hte previous posters could be correct.
what it actually is depends on whether the truck that it's in has drum/drum, disc/disc or disc/drum.
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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06-17-2007, 05:29 PM
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#5 |
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Registered User
Join Date: Mar 2007
Location: Nashville
Posts: 62
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Re: Manual to Power Brake conversion
Disc up front, Drum in rear
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06-17-2007, 05:46 PM
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#6 |
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Registered User
Join Date: Mar 2007
Location: Nashville
Posts: 62
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Re: Manual to Power Brake conversion
Just took a snap shot of the donor, this came off a 78 Chevy from the bone yard. Cost me $10.00
Last edited by RM72chevy; 06-17-2007 at 05:46 PM. |
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06-17-2007, 09:47 PM
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#7 |
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Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: Manual to Power Brake conversion
it's a combo/combi/combination valve, then.
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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06-17-2007, 10:33 PM
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#8 |
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The Older Generation
   
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,334
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Re: Manual to Power Brake conversion
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The valve for the 78 is mounted on the front crossmember. If you're not too far from the yard I would go back & get it. That way you have the right one and you can mount it on your crossmember to get it out of sight. Just my 2¢ worth LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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