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05-19-2002, 05:09 AM
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#1 |
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Registered User
Join Date: Dec 2001
Location: harvard, il. USA
Posts: 394
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brake lines and bleeding ?'s
Woo-Who...wifes gone for the weekend and im actually making progress on my truck!!! Yesterday I finished r&r on the entire brake system, and suprisingly the new lines don't look bad (that bender really helped). I've bench bled the master, and its all set to make the final connection.
Q #1=>should I have used thread sealer? I've never had problems b/4 but?????? Q #2=>how do i test for leaks? Im the only one at home, and I can't get a hold of my bro. How do you gravity bleed the brakes? He told me a long time ago how but I think you jack the front dr. higher than rest, bleed rear dr. first, rear pass, front pass then front dr. I've never done grav-bleed b/4. Its all level on jack stands right now. Thanks for any help...don t. ..... ------------------ It aint gonna be a trailer queen, its gotta work, just like me. 3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60. |
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05-19-2002, 07:18 AM
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#2 |
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Account Suspended
Join Date: May 2002
Location: Olathe, Kansas
Posts: 929
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When bleeding the brakes, you start with the wheel furthest from the master cylinder and work your way in.
As for gravity bleeding, start with the Right Rear, open the bleeder, take the master cylinder resivour cover off and allow it to do its thing. Since everything is new and dry, the fliud has a natural tendancey to crawl through the line pretty quick (acks like a wik). After you feel like you have moved all the air from the lines, pump the brakes to get a good high pedal, then just stand on the brake pedal (if you have power brakes start the engine)and put maximum pressure through the system. Go around and check all fittings. You should really have someone else there though.... its best to check them WHILE there is pressure on the system. Plus, I always like to bleed the brakes again after this is done. Oh, there is no need for thread sealer... The threads are only there to press and hold the line against its sealing seat. If you have a leak, check both surfaces of the connection, dont use thread sealer. ------------------ Pictures and more... piston@zkast.com '71 LWB 350/350T, PS/PB Special options? Yes, RUST... Need some? Garrett - Olathe, Kansas |
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05-19-2002, 08:14 AM
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#3 |
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Registered User
Join Date: Dec 2001
Location: harvard, il. USA
Posts: 394
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Thanks Zkast. I talked to the neighbor whos a shade-tree as well. He said same about sealer. He also said he'd come over later today for final bleeding (i'll pump bleed as well).
I started on the rear dr. side. Found one leak by master, fixed. Started flowing well. Now its stopped, haven't added fluid in over 20 minutes. I don't see any leaks. And it aint comming out the bleeder valve on wh. cyl. Since its a dual master, figured I'd bleed fronts. Fluid flowed from both calipers real well. Checked rear fluid level, no change. What happened w/the rears? Thanks....don t. .... ------------------ It aint gonna be a trailer queen, its gotta work, just like me. 3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60. |
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05-19-2002, 08:22 AM
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#4 |
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Account Suspended
Join Date: May 2002
Location: Olathe, Kansas
Posts: 929
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Might have to elevate the front.. The rear lines are longer and smaller diameter. Or just wait for your neighbor to come over.
------------------ Pictures and more... piston@zkast.com '71 LWB 350/350T, PS/PB Special options? Yes, RUST... Need some? Garrett - Olathe, Kansas |
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05-19-2002, 09:17 AM
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#5 |
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Registered User
Join Date: Dec 2001
Location: harvard, il. USA
Posts: 394
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I put on the rear tires and lowered. Front dr. side is about 18" high, fr. pass. about 12 (+/-). Aint helping/no flow. Guess I gotta wait for neighbor.
Even tho i've dbl checked, would a leak down stream cause it to stop flowing? Just wondering why/trying to understand. I understand that downstream pressure exceeds flow but??? Thanks for your help....don t. .... ------------------ It aint gonna be a trailer queen, its gotta work, just like me. 3/4 ton,350 w/HEI, 79 q-jet, th400, Dana 60. |
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05-19-2002, 12:39 PM
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#6 |
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Registered User
Join Date: Jan 2001
Location: Killingworth, CT. USA
Posts: 3,378
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You may need to reset (center) the proportioning valve to get the fluid out the rear cylinders. Pumping the brakes with a lot of air in the lines may have tripped the prop valve.
------------------ 1971 C10 swb stepside 350/700R4/3.73posi Killingworth, Connecticut
__________________
1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. |
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