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#1 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Proportioning valve question
Im swapping to disc breaks in my 68 but i am keeping my manual brakes. i know that i need a prop valve and i have one on a truck that is a parts truck so would it be ok to use this one or should i buy a new one? will a master cyl off a 75 truck bolt up to my 68?
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#2 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Proportioning valve question
you will need a disc drum prop valve(assuming you keep your drums in the back still)
keep an eye on the parts board or buy a new one. A car disc drum works also. Summit/board vendors/speedway/ece/cpp etc will have one!
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#3 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: Proportioning valve question
would you think it safe to use the 40 year old one chilling on my parts truck??
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#4 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,648
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Re: Proportioning valve question
Disc brakes take more pressure to operate, which is why most are power -- you probably know that already, just a heads up since you are staying manual. It may take a lot more leg to whoa the truck down with manual discs.
Having said that, my old '65 Corvette had 4-wheel manual discs and seemed just fine to me!
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#5 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: Proportioning valve question
thanks for the heads up! got plenty of leg (600lb squat max) im just hoping that the truck will stop reliably when i get this all set up lol
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#6 |
Registered User
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
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Re: Proportioning valve question
Most won't recommend not using power front disk. But I have seen it done and drove a few setups that way. And once they are free of air they work fine. They will not put you through the windshield as with power brakes but you will see minor improvement over the front drums brakes. Personally compromising on a few bucks on brakes /steering is never worth the safety sense you get in return.
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'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629" |
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#7 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Proportioning valve question
Plenty of these trucks came with disc brakes and non power assist. They stop exactly as well as trucks with power assist, just more leg pressure needed. The hydraulics are the same. Safety is the same. Driver convenience is the only area that's not equivalent.
Assuming your parts trucks prop valve has been kept sealed up and not had lines loose and water getting into it you should be quite able to use it on your truck. Further, yes the master cylinder will bolt to your firewall. The bolt patterns are the same Posted via Mobile Device
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I'm on the Instagram- @Gearhead_Kevin Last edited by Tx Firefighter; 12-28-2010 at 06:08 AM. |
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#8 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Proportioning valve question
i'd use the old prop valve as they rarly have problems but i whould spend a bit of money and get a new master cylinder
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#9 |
Registered User
Join Date: Apr 2010
Location: Raleigh NC
Posts: 157
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Re: Proportioning valve question
I just put power brakes on a '71 that came from the factory as a standard, no power disc/drum set-up. The 1975 master/ booster will work fine, but you'll have to make some kind of brackets to mount it. I used the original NON-POWER proportioning valve that came in my truck and it works just fine! Basically, in our trucks, there only 2 different valves, disc and non-disc. They don't care where the pressure comes from!
It's an easy swap and a huge improvement in drivability. You'll love it! |
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#10 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: Proportioning valve question
hey guys thanks for all the info! just got the spindles broke loose today and ball joints and New MC are on their way!
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#11 |
Registered User
Join Date: Oct 2009
Location: canton ga
Posts: 12,728
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Re: Proportioning valve question
I think I still have my prop valve from my disc/drum truck .I upgraded to power disc ,you can have it if you want it ,just pay shipping.
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#12 |
Registered User
Join Date: Dec 2008
Location: Ashland, KY
Posts: 700
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Re: Proportioning valve question
if you can find it ill give ya some money for it! figure out shipping to 41102 is and ill paypal what you need out of it to ya!
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68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD |
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#13 |
Registered User
Join Date: Oct 2009
Location: canton ga
Posts: 12,728
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Re: Proportioning valve question
Let me look in my shop to make sure its still there .Ill let you know .
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#14 |
Registered User
Join Date: Oct 2009
Location: canton ga
Posts: 12,728
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Re: Proportioning valve question
I just got back in from my shop .The prop. valve is still attached to the master cylinder and lines are intact .Would you want the whole set up and just pay shipping .I dont need it in my way in my shop and you can use it if you want it .It worked fine on my 72 as I just bought a complete master cylinder w/booster and prop valve .Let me know and I can get it to you .PM your name and address and tell me if you want it all or just part and I can get it on its way and you can send postage after you receive it .
John |
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#15 |
Registered User
Join Date: Apr 2010
Location: Raleigh NC
Posts: 157
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Re: Proportioning valve question
For what it's worth, although they look a bit different, the ones from 1973 to 1987 work exactly the same. They mount on the front cross member. They are front disc / rear drum when they come off the pickup. The cars all had them, too, and they are probably the same, but I have never tried those.
best wishes |
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#16 |
Registered User
Join Date: Oct 2009
Location: canton ga
Posts: 12,728
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Re: Proportioning valve question
Tx Firefighter ,good to see you again .I always enjoy your posts ,someone said you were mostly on the 65 area of the board .I havent been there yet.
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#17 |
Registered User
Join Date: Oct 2009
Location: canton ga
Posts: 12,728
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Re: Proportioning valve question
BIGBLU72 ,The master cylinder and prop. valve are on their way to you .I put them in the mail this morning and should arrive to you sometime on Monday. I will PM you the tracking number and I left a card with my address in the box .You can re pay the postage at your convenience after the packsge arrives .I hope it is what you need and its one less part in my shop in my way.
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