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Old 07-24-2008, 11:35 PM
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Break issue, PLEASE HELP!!!

OK, so I decided I needed line lock, and in the process also put in a new master cylinder. The Car is a 67 Camaro and has 4 wheel wilwood disks.

After installation and bleeding of the breaks, I still only have limited pedal feel. If I pump them 3 or 4 times quickly I get good pressure, but as soon as i let off for a couple of seconds I loose pressure again and can almost bottom out the pedal.

I have tried two different master cylinders, one after market and one from an 82 Corvette (which had 4 wheel disks, I believe).

I have two conflicting theories about this, from two different sources, and want to know some other opinions. One is that there is still a bit of air in the line, but I thought this would make them spongy all the time and wouldn't pump up. The other is that the master cylinder isn't moving enough fluid in one stroke, but I was told that both of the masters I tried should have worked. Thus I'm at a loss as to how to fix this, and am getting pissed that my car has been up on blocks for going on 3 weeks..... Hell we only get 4 months of good driving weather up here, I want to cruise!!

The car stopped very well before I pissed with anything, Yes I know I'm a dumb ***!!

HELP ME PLEASE!!!

Thanks
James

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Old 07-24-2008, 11:36 PM
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Oh, and there aren't any leaks, and once pumped up they will hold pressure just fine.
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Old 07-24-2008, 11:49 PM
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These 4-wheel disc brakes DID work properly before you installed the line-loc?

Or is this a new installation of all 4 calipers / rotors?
If so, you are going to need a different proportioning valve.
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Old 07-25-2008, 08:09 AM
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Did you bench bleed the new master cylinder?
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Old 07-25-2008, 10:17 AM
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The car had the 4 wheel disks befor I put in the line lock, and all worked well.

I did not "bench bleed" the new master, as I'm not sure what that is, and have not herd of it befor. I did bleed the fittings going into, out of and all around the master, proportioning valve, line lock, ect. All have fluid coming out, and no air.
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Old 07-25-2008, 12:09 PM
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The bench bleeding process should be done. Have a look at this page, about half way down for Bench Bleed and Test the Master Cylinder
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Old 07-25-2008, 01:15 PM
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Let me get this straight, "The car had the 4 wheel disks befor I put in the line lock, and all worked well" you install a line lock, there now is a problem and you start replacing master cylinders?????

Read that again..........ok read it again.............................


The LINE LOCK is the issue, OR your bleeding after installing it. The master cylinder had nothing to do with your problem.....it was after all.......working befor.

Brian
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Old 07-25-2008, 02:17 PM
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Quote:
Originally Posted by MARTINSR
Let me get this straight, "The car had the 4 wheel disks befor I put in the line lock, and all worked well" you install a line lock, there now is a problem and you start replacing master cylinders?????

Read that again..........ok read it again.............................


The LINE LOCK is the issue, OR your bleeding after installing it. The master cylinder had nothing to do with your problem.....it was after all.......working befor.

Brian
I missed that one , and you are probably correct the line lock was the issue.
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Old 07-25-2008, 07:21 PM
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Had to replace the master cylinder. I'm a ******* and put in the wrong fluid, and screwed the seals. Didn't replace to fix this problem, replaced at the same time and created the problem. Line lock appears to be working fine...

Didn't know you could bleed before installing, I will check that out. I also didn't think you had too..... Shouldn't bleeding at the fittings do the job? I have flushed through at least 1 liter of fluid at each wheel, wouldn't that get the air out?

Thanks again
James
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