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04-02-2013, 05:28 PM | #26 |
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Re: New master and now no power brakes
A 1 1/8" bore is not typically used for disc brakes. I don't think that was the problem. Maybe they gave you a drum/drum prop valve. I would start by checking the fluid pressure at the calipers. Should be between 800-1200 psi.
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04-02-2013, 05:41 PM | #27 |
67-72 parts collector,…
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Re: New master and now no power brakes
Drum/drum set ups have a distribution block, not a proportioning valve.
The 71-72 M/C with a booster had a 1-1/8" bore.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
04-02-2013, 06:56 PM | #28 |
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Re: New master and now no power brakes
Do you know where to buy a stock looking aluminum M/C other than from PICKMUP? Thanks, Nate
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Nate 1967 short fleet Project Blue Goose 'If it don't bounce back... heeheehee you go hungry!" Blues Brothers |
04-02-2013, 07:17 PM | #29 | |
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Re: New master and now no power brakes
Quote:
http://www.performanceonline.com/Dis...h-Performance/ http://ssbrakes.com/i-10092246-maste...-aluminum.html
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 Last edited by lolife99; 04-02-2013 at 07:23 PM. |
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04-03-2013, 06:34 PM | #30 |
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Re: New master and now no power brakes
Well I replaced the master with the 1 1/8 bore master and the brake pedal is worse. The pedal stroke is better but overall it is a tad bit worse. I'm thinking that maybe the brake pads just need to seat in.
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Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!" |
04-03-2013, 07:16 PM | #31 |
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Re: New master and now no power brakes
What would the symptoms be if I had a disc/disc prop valve?
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Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!" Last edited by shawno72; 04-03-2013 at 07:41 PM. |
04-03-2013, 07:45 PM | #32 |
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Re: New master and now no power brakes
Are you sure you have all the air out?
How much "free play" in the pedal? (should be 1/8"-1/4")
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
04-03-2013, 08:26 PM | #33 |
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Re: New master and now no power brakes
Free play is about 1/4 or less. Nothing but clear fluid being bleed out. Really feels like maybe it needs a stronger booster? I don't know what to do.
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Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!" |
04-03-2013, 08:30 PM | #34 |
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Re: New master and now no power brakes
Even though I bought my prop valve from CPP the only markings on it are "PM" One I had before had the correct part number PV2.
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Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!" |
04-05-2013, 11:57 AM | #35 | |
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Re: New master and now no power brakes
Quote:
A 71/72 prop valve should deliver more pressure to the front calipers than to the rear line. A drum/drum "metering block" is just going to deliver straight line pressure to all 4 wheels. |
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04-05-2013, 11:59 AM | #36 |
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Re: New master and now no power brakes
I would put that 1" bore master back on, and then check your actual pressure at the caliper. If it is 800-1200 psi you can assume the pads need to seat in, or maybe the rotor finish is really bad and the pads are glazed over.
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04-05-2013, 12:18 PM | #37 | |
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Re: New master and now no power brakes
Quote:
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Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!" |
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04-11-2013, 11:10 AM | #38 |
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Re: New master and now no power brakes
Hey Shawn, any updates on the brake issue?
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04-11-2013, 11:12 AM | #39 |
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Re: New master and now no power brakes
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04-11-2013, 11:13 AM | #40 |
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Re: New master and now no power brakes
Yeah Shawno.... What's the news. I ask because mine feel like they are getting worse each day! It now feels like my pedal is bottoming out the M/C in the bore.
Maybe I got a bad M/C
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
04-11-2013, 11:47 AM | #41 |
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Re: New master and now no power brakes
Well guys I got an aluminum master that will go on Saturday, I re adjusted the rear brakes nice and tight and the pedal has been fine. I still think the new master with the 1" bore will be the cats meow. I'll update you guys on Saturday.
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Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!" |
04-17-2013, 12:50 PM | #42 |
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Re: New master and now no power brakes
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Nate 1967 short fleet Project Blue Goose 'If it don't bounce back... heeheehee you go hungry!" Blues Brothers |
04-17-2013, 03:48 PM | #43 |
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Re: New master and now no power brakes
Sorry guys been super busy at work so no new master installed yet. Ever since I re adjusted the rear brakes they hav been fine so I am a little hesitant to swap on the aluminum master for fear they may be worse
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Shawn 70 LWB C10 current driver/project http://67-72chevytrucks.com/vboard/s...d.php?t=663051 68 SWB C10 Work in progress.....SOLD http://67-72chevytrucks.com/vboard/s...d.php?t=559520 72 LWB C10 Sold 71 LWB C10 Sold 68 LWB C10 CST Sold http://youtu.be/kbB0QrBIs9k My mom always had the best advice. It was just a tad late. After a fall that involved blood, she'd say....."Careful!" |
04-17-2013, 06:12 PM | #44 |
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Re: New master and now no power brakes
He who dares wins!
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11. 1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9 |
04-17-2013, 06:34 PM | #45 |
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Re: New master and now no power brakes
Hey Shawn, have you ever checked how much vacuum your truck is producing? Do a simple vacuum test and see if your in the 18"-22" range. If you're below 18" of vacuum, you won't have enough to operate them on a vacuum booster as well as you would expect. They will still work, but just like you're explaining.
When I had this problem with my GTO, I thought I had bled the system pretty well, but wound up paying a shop to pressure bleed my brakes and they were able to get more air out, which helped but still didn't get it to where my drums were. I found out that I didn't have enough vacuum to operate the typical vacuum booster so I switched to hydraulic. Do a vacuum test so you can at least rule that out. I'm curious if your next swap will fix your problem. Good luck!
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