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#1 |
Registered User
Join Date: Feb 2022
Location: Victoria British Columbia
Posts: 4
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69 c10 Brake master reservoir layout
Recently finished swapping to a dual pot master cylinder from a 69 c10 on my 63 now with discs up front and still drums in the rear..
Had a bit of an interesting time bleeding the brakes last night and Im wondering if I got the layout of the reservoirs wrong. I piped it front to rear and rear to front. Is that correct? |
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#2 |
Senior Member
![]() Join Date: Mar 2015
Location: washington
Posts: 2,243
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Re: 69 c10 Brake master reservoir layout
It is my understanding that the "backwards" lines were used on the 3/4T trucks. Their 1/2T little brothers used the standard front reservoir to the front brakes. You didn't mention which reservoir you purchased.
Need some more information. But generally I would say it's backwards. You seem to be missing the proportioning valve that also indicates if you lost fluid on half the brakes. (Never mind, I see it attached at the firewall now I looked closer). Should be a great upgrade. Last edited by Accelo; 05-01-2022 at 12:42 PM. |
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#3 |
Registered User
Join Date: Feb 2022
Location: Victoria British Columbia
Posts: 4
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Re: 69 c10 Brake master reservoir layout
I believe its a 69 half ton brake master.
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#4 |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,963
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Re: 69 c10 Brake master reservoir layout
A couple notes, some have already been highlighted. While it likely has nothing to do with bleeding problems, there are a few issues with your setup:
- a 69 C10 MC is not a disk brake MC. 71+ were disk MCs. - on a 1/2 ton truck MC, the front reservoir feeds the front disk (or front drum) brakes. If disk, front lines should be 3/16"; if drum, front lines should be 1/4". The rear reservoir feeds the rear drum brakes and should use 1/4" lines. If I'm interpreting your first post and picture (flipped below) correctly - you currently have the front res going to the rear drums with 3/16" lines - and the rear res going to the front disks with 1/4" lines - is that correct? While that may (kinda) work once you get the bleeding issue sorted out, it won't work as it was designed. Can you confirm this is actually the case? If it is, recommend: 1) replace MC with a disk brake MC (recommend doing this regardless) 2) run 1/4" lines to rear drums (from the rear MC res) 3) run 3/16" lines to front disks (from the front MC res) Sorry, not what you want to hear I know. Again, pls confirm I'm reading your post correctly - quite possible I'm mininterpreting. Also, is that a residual or proportioning valve? If the latter, both front and rear brake lines from the MC normally go into a prop valve as it is designed to balance front/rear bias. Not sure what I'm seeing there though, so just asking. |
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#5 |
Senior Member
![]() Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,282
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Re: 69 c10 Brake master reservoir layout
Incorrect master for disc brakes. The valve that’s plumed in is an adjustable prop valve, which only gets plumbed into the rear circuit.
__________________
70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Power windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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#6 |
Senior Member
![]() Join Date: Jan 2009
Location: Logansport,In
Posts: 546
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Re: 69 c10 Brake master reservoir layout
Nice job on the lines, at least.
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#7 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,489
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Re: 69 c10 Brake master reservoir layout
To reinforce what was recommended above:
1. Get a M/C for a 71-72 C10. It will have a larger front reservoir which feeds the front disc calipers via 3/16" line. It will also have a 1-1/8" bore, whereas the 69 M/C has a 1" bore. 2. The proportioning valve should be in series with the rear brake line, which is 1/4". Crack it wide open to start, and don't adjust it unless the rears lock up before the fronts during a panic stop. 3. If you already have a 3/16" rear line, I'd probably go with it. Square body trucks had 3/16" front and rear, at least that was true for my 82 C10.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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