Flushing brake lines
Thread Starter
Burning Brakes
Joined: Jul 2002
Posts: 972
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From: Springdale AR
Flushing brake lines
Installing a new Master Cylinder in a 92 vette, when I took the reservoir off the MC it had lots of black gump in it. I cleaned the reservoir out good but now, before I install my new MC what is the best method to flush out the lines to insure that none of that gunk is plugging up the lines?
Safety Car
Joined: Mar 2000
Posts: 3,581
Likes: 1
From: Springfield VA
Re: Flushing brake lines (vette92_1)
By a quart of cheap brake fluid from Track, PepBoys, etc. and bleed each line until they run clean. Do NOT flush with anything containing mineral spirits, or alcohol.
Thread Starter
Burning Brakes
Joined: Jul 2002
Posts: 972
Likes: 0
From: Springdale AR
Re: Flushing brake lines (96LT1)
Cool, thanks guys, I thought about that ABS system, I was looking at a diagram of where all the lines are and how they are ran in one of my maintenance books and I noticed them all going through that system, I just hope they are not plugged in it anywhere. I think that is a good idea on the cheap break fluid to try and bleed all the lines clean first, then go back with good stuff.
Melting Slicks
Joined: May 2001
Posts: 2,143
Likes: 7
From: San Diego CA
Re: Flushing brake lines (vette92_1)
You'll need to connect a TECH II (GM Computer tool) to properly cycle the ABS body to flush it out.
One other spot to bleed would be on the ABS body itself. It's almost the high point in the system (except for the Master Cylinder). I understand that some early ABS units don't have a bleeder, I don't know when it started.
One other spot to bleed would be on the ABS body itself. It's almost the high point in the system (except for the Master Cylinder). I understand that some early ABS units don't have a bleeder, I don't know when it started.
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Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Re: (ToniH)
I don't know if it is because of the ABS but the sequence for '91 (and probably '92 too) is RF, RR, LR, LF.
Eric
Racer
Joined: May 2001
Posts: 320
Likes: 0
From: TX
Re: (silver & red CE)
When you bleed brakes, you always bleed the longest line first and the shortest line last. Since the ABS unit is in the back, that means that the RF has the longest line and the LR the shortest. The correct bleed order is RF, LF, RR, LR. I have not bled my ABS so I don't know if it should be done first or last in the sequence.
Melting Slicks
Joined: May 2000
Posts: 2,029
Likes: 63
Re: (kkonen)
kkonen: The correct bleed order is RF, LF, RR, LR
It says in the GM '91 Vette service manual that the correct sequence is RF, RR, LR, LF if you are bleeding manually ie. the old way.
And if you are bleeding with pressurised system the sequence is the same RF, RR, LR, LF.
Don't know if this differs between years??
ToniH
[Modified by ToniH, 8:38 PM 7/10/2002]
It says in the GM '91 Vette service manual that the correct sequence is RF, RR, LR, LF if you are bleeding manually ie. the old way.
And if you are bleeding with pressurised system the sequence is the same RF, RR, LR, LF.
Don't know if this differs between years??
ToniH
[Modified by ToniH, 8:38 PM 7/10/2002]
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Re: (silver & red CE)
OOPs, I have my 1996 FSM open to page 5-12, second column, it says to bleed RR, LR, RF, LF. I did it this way, using SUPER BLUE yellow fluild to replace the blue stuff. It takes a long time to clear the RR, the LF is cleared within 5-6 pumps. And when I look to page 5E2-100 second column, under autobleed procedure (bleeding the ABS pump), it has the same sequence.
If you flush your fluid once a year, I bet it doesn't really matter what sequence you use, the fluid will be fresh.
Eric
[Modified by silver & red CE, 12:26 PM 7/10/2002]
If you flush your fluid once a year, I bet it doesn't really matter what sequence you use, the fluid will be fresh.
Eric
[Modified by silver & red CE, 12:26 PM 7/10/2002]
Melting Slicks
Joined: Jun 2001
Posts: 2,979
Likes: 0
From: Poquoson VA
Re: (silver & red CE)
WOW, lots of opinions on sequence :crazy:
Here is what worked for me, may have been wrong but it worked.
First time: Removed old fluid from Master Cyl, refilled with Wilwood 570 and bled like heck until clear at all wheels. Worked farthest from the MC to closest (didn't think/know about ABS unit) Seq = RR,LR,RF,LF
Couple of days later...skunky fluid again?? fluid from the ABS unit, probably.
I know Bill, the beer in the Garage 'frig was skunky too!
Second time: Same thing but used LR, RR, LF, RF sequence.
6 pints of fluid later(total for both days) I got clear fluid, no runs, no drips, no errors :cheers:
[Modified by York67vette, 1:51 PM 7/10/2002]
Here is what worked for me, may have been wrong but it worked.
First time: Removed old fluid from Master Cyl, refilled with Wilwood 570 and bled like heck until clear at all wheels. Worked farthest from the MC to closest (didn't think/know about ABS unit) Seq = RR,LR,RF,LF
Couple of days later...skunky fluid again?? fluid from the ABS unit, probably.
I know Bill, the beer in the Garage 'frig was skunky too!
Second time: Same thing but used LR, RR, LF, RF sequence.
6 pints of fluid later(total for both days) I got clear fluid, no runs, no drips, no errors :cheers:
[Modified by York67vette, 1:51 PM 7/10/2002]
