Brake goes straight to the floor

1972_442 · 11-18-2007, 03:11 PM

Ive bleed these brakes for over 4 hours and every time the brake pedal still goes straight to the floor when the engine is running, the wheel cylinders, rubber brake lines, and master cylinder were all replaced and i bench bled the master cylinder but still have no breaks. could it be the booster? is it common to need to replace the metal lines? this is a very aggravating problem. i was going to do a disc brake conversion should i just go ahead and do that?

kevinkpk · 11-18-2007, 04:27 PM

Quote:

Originally Posted by 1972_442

Ive bleed these brakes for over 4 hours and every time the brake pedal still goes straight to the floor when the engine is running, the wheel cylinders, rubber brake lines, and master cylinder were all replaced and i bench bled the master cylinder but still have no breaks. could it be the booster? is it common to need to replace the metal lines? this is a very aggravating problem. i was going to do a disc brake conversion should i just go ahead and do that?

If you have no external leaks, then you have an internal leak, check the vacuum booster.

Dapapadon · 11-18-2007, 04:36 PM

Or a bad master cyclinder.

kevinkpk · 11-18-2007, 04:45 PM

Quote:

Originally Posted by Dapapadon

Or a bad master cyclinder.

yep, an internal leak, master cyl. could be bleeding through the front and rear.

Modern Motoring · 11-21-2007, 01:33 PM

if it's taking you 4 hrs to bleed brakes, I would recommend that you NOT go ahead and do a disc brake conversion. You think you're aggravated now? Holy Crikey! Call Booster Dewey in Portland Or. Tell him what is happening, dime to a donut it's the booster.

1972_442 · 11-21-2007, 03:54 PM

yea i went ahead and got a new booster, i know i dont think its the master cylinder because its the second one ive put on the car. the white plastic sleeve on the back of the booster was cracked in some places would that affect the brakes. id have to order it from year one but i really dont want to wait a week just to put the new booster back on.

ozoneblue · 11-21-2007, 05:15 PM

When you bench bleed the master CYL. Do not push in over 1" that will cut the new seals to bleed system start with RR & let it gravity bleed -Drip for a while then LR RF &LF Keep a eye on your fluid level.

crackie · 01-04-2008, 06:42 PM

I had the mastercylinder and booster rebuilt and I bench bled it and put on car but couldn't get it to bled , I was told that when I pushed the plunger all the way down when I bench bled that it cut the seals is this true. Crackie

Oldsguy · 01-05-2008, 09:16 AM

yes, as ozoneblue posted just above....it is true.

11-18-2007, 03:11 PM	#1 (permalink)
1972_442 Junior Member Join Date: Nov 2007 Location: charlotte,nc Posts: 10	Brake goes straight to the floor Ive bleed these brakes for over 4 hours and every time the brake pedal still goes straight to the floor when the engine is running, the wheel cylinders, rubber brake lines, and master cylinder were all replaced and i bench bled the master cylinder but still have no breaks. could it be the booster? is it common to need to replace the metal lines? this is a very aggravating problem. i was going to do a disc brake conversion should i just go ahead and do that?

01-04-2008, 06:42 PM	#8 (permalink)
crackie Junior Member Join Date: Jan 2008 Posts: 1	Bleeding 57 Oldsmobile brakes I had the mastercylinder and booster rebuilt and I bench bled it and put on car but couldn't get it to bled , I was told that when I pushed the plunger all the way down when I bench bled that it cut the seals is this true. Crackie

01-05-2008, 09:16 AM	#9 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,526	yes, as ozoneblue posted just above....it is true. __________________ Dan '46 2 door

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11-18-2007, 04:36 PM	#3 (permalink)
Dapapadon Senior Member Join Date: Jan 2007 Location: Portland, OR Posts: 214	Or a bad master cyclinder.

11-21-2007, 01:33 PM	#5 (permalink)
Modern Motoring Senior Member Join Date: Aug 2007 Location: Sacramento Posts: 108	if it's taking you 4 hrs to bleed brakes, I would recommend that you NOT go ahead and do a disc brake conversion. You think you're aggravated now? Holy Crikey! Call Booster Dewey in Portland Or. Tell him what is happening, dime to a donut it's the booster.

11-21-2007, 03:54 PM	#6 (permalink)
1972_442 Junior Member Join Date: Nov 2007 Location: charlotte,nc Posts: 10	yea i went ahead and got a new booster, i know i dont think its the master cylinder because its the second one ive put on the car. the white plastic sleeve on the back of the booster was cracked in some places would that affect the brakes. id have to order it from year one but i really dont want to wait a week just to put the new booster back on.

11-21-2007, 05:15 PM	#7 (permalink)
ozoneblue Senior Member Join Date: Jun 2006 Posts: 403	When you bench bleed the master CYL. Do not push in over 1" that will cut the new seals to bleed system start with RR & let it gravity bleed -Drip for a while then LR RF &LF Keep a eye on your fluid level.