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#1 |
Registered User
Join Date: Apr 2013
Location: sapulpa oklahoma
Posts: 151
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1968 c10 brake proportioning valve
is it possible that this is the reason i cannot get any pedal to my brakes? i have bled three brake fluid bottles through and it still goes to the floor. i got a master cylinder bleeding kit and di that. still to the floor. the shoes are adjusted out properly. the proportioning valve is the only thing left.
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#2 |
Registered User
Join Date: Apr 2013
Location: sapulpa oklahoma
Posts: 151
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Re: 1968 c10 brake proportioning valve
why does my truck with drum brakes even have what is called a disc brake proportioning valve? and can i just bypass this?
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#3 | |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: 1968 c10 brake proportioning valve
Quote:
Drum brake trucks just have a distribution block.
__________________
Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#4 |
Registered User
Join Date: Apr 2013
Location: sapulpa oklahoma
Posts: 151
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Re: 1968 c10 brake proportioning valve
this is what is below my master cylinder. I have drum brakes all the way around. i can bypass this right?
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#5 |
Registered User
Join Date: Apr 2013
Location: sapulpa oklahoma
Posts: 151
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Re: 1968 c10 brake proportioning valve
so is this something i can remove and connect brake lines directly to the master cylinder? any thoughts? this is my last place to look in finding why i cannot get anything but a saft pedal. straight to the floor. no matter what i have done.
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#6 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: 1968 c10 brake proportioning valve
You can remove it,... but you will lose your brake light switch.
You may have a bad M/C. I would bench bleed it and try again.
__________________
Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#7 |
Registered User
Join Date: Jul 2012
Location: Maple Ridge. B.C.
Posts: 145
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Re: 1968 c10 brake proportioning valve
Is your master cylinder new? It's hard to tell from the picture. If the master cylinder is used, maybe the cup seals in the master cylinder could be leaking by causing the pedal to go down. If the master cylinder is new. Start by bench bleeding it, slowly. Don't pump it hard and fast. If there is air in it you could break up the air and air rate the fluid. Then instal the cylinder and start by bleeding the right rear wheel first. Then left rear, then right front then left front. Again pump the pedal slowly and don't turn the air and fluid into foam. Good luck.
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#8 |
Account Suspended
Join Date: Oct 2012
Location: Salt Lake City, Utah
Posts: 3,331
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Re: 1968 c10 brake proportioning valve
Get a new master cylinder for $17, and bench bleed it. Your current one has probably gone bad
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#9 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: 1968 c10 brake proportioning valve
i have found buying and reading a factory service manual for a particular vehicle can help you know what you have and how to fix it
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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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#10 |
Registered User
Join Date: May 2012
Location: Faith,NC
Posts: 1,626
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Re: 1968 c10 brake proportioning valve
I have never seen bleeder screws ON the master cylinder before! WOW! Are they tight when your pumping? You did put the cap back on, right? Sounds dumb but it could happen. Do you EVER get a tight pedal? or is it always soft?
Last edited by Steve Cole; 07-22-2013 at 01:40 PM. Reason: typo |
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#11 |
Registered User
Join Date: Jul 2012
Location: Maple Ridge. B.C.
Posts: 145
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Re: 1968 c10 brake proportioning valve
Is the pedal just low towards the floor or is it spongy. That is two different problems. If the pedal is low could be brake shoes out of adjustment or be shoes not seated into the drums. If the pedal is hard then creaps to the floor it could be the master cylinder leaking internally. If the pedal is just spongy then it could be air in the system. Just another thing to consider.
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#12 |
Registered User
Join Date: Apr 2013
Location: sapulpa oklahoma
Posts: 151
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Re: 1968 c10 brake proportioning valve
if it sits any time at all, the pedal goes straight to the floor, after a few pumps, there is pedal again. the master cylinder was bought new at oreillys a year ago and installed then. only in the last month have i gotten all the lines and things replaced and hooked up.
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#13 |
Registered User
Join Date: Apr 2013
Location: sapulpa oklahoma
Posts: 151
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Re: 1968 c10 brake proportioning valve
so the bleeder valves on the mc are strange?
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#14 |
Registered User
Join Date: Apr 2013
Location: sapulpa oklahoma
Posts: 151
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Re: 1968 c10 brake proportioning valve
well the truck never ran. it was parked the whole year ive had it,but i guess my next step will be a different master cylinder, just do it and see what happens.
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#15 | |
Account Suspended
Join Date: Oct 2012
Location: Salt Lake City, Utah
Posts: 3,331
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Re: 1968 c10 brake proportioning valve
Quote:
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