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Old 07-07-2019, 08:16 PM   #1
Jbear
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Default Length of brake line

Can any of you tell me the overall length of the metal brake line from the proportioning valve to the right front (passenger side) caliper?

I need to replace the line. I'm using Nicopp, I have all the tools for flaring and so on.
It looks like I'll have to get under the car to get the various clips loose to pull this out.

My idea (because of some physical issues, getting up and down from the ground is pretty difficult for me.) I'm thinking I might be able to pull the old line and put in the new one at the same time (bending as I go) if I know how long a piece to cut. I can put on the fittings and flare the ends beforehand.

Not sure this will work, but thought it might be worth a try. The first obstacle is the plastic holder that all the lines run through, just below the proportioning valve. I'm still looking for how to take that off to get the old line out.

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Old 07-07-2019, 08:32 PM   #2
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Default Re: Length of brake line

Here you go:
http://www.saturnfans.com/forums/sho...d.php?t=236929

I pulled these lines in and as I went I bent in place. I like the bend the new line to match the old line technique better.


http://www.saturnfans.com/forums/sho...&postcount=135

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Old 07-08-2019, 10:53 PM   #3
Jbear
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Default Re: Length of brake line

Thanks, Brian, I appreciate it, but, um... I needed the length of the line to the front passenger side.

I'll keep the info for the 2 rear lines in case I need it later.

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Old 07-27-2019, 09:31 PM   #4
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Default Re: Length of brake line

I kept the old line after I removed it so I could measure it. Just got around to it. The length of the line to the front passenger side is 72" (6 ft.). I allowed an extra couple of inches from the actual measurement for the ends I cut off to get the fittings.

I'll be changing the other front line in a few days, I'll post that measurement as well. Maybe that will be helpful for someone else.

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Old 07-27-2019, 09:37 PM   #5
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Default Re: Length of brake line

Quote:
Originally Posted by Jbear View Post
I kept the old line after I removed it so I could measure it. Just got around to it. The length of the line to the front passenger side is 72" (6 ft.)
Wow, I never would have guessed it was that long. I don't know how it's routed though. Mine looks pretty crusty, and I'm a bit nervous about it.

...
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Old 07-27-2019, 09:52 PM   #6
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Default Re: Length of brake line

Proportioning valve?

I just did the brakes on the 92 SC - and I didnt see one....

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Old 07-27-2019, 11:23 PM   #7
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1998 SC2
Default Re: Length of brake line

It is part of the master cylinder, there are 2 of them.

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Old 07-27-2019, 11:45 PM   #8
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Default Re: Length of brake line

Ok..thanks.

Didn't know they had one. So is it adjustable, or do they have two MCs for drum vs disc rear?

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Old 07-28-2019, 06:29 AM   #9
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Default Re: Length of brake line

Stupid question time: what if the two rear lines were switched at the master cylinder, how catastrophic would that be?

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Old 07-28-2019, 10:00 AM   #10
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Default Re: Length of brake line

Quote:
Originally Posted by Goggles Pisano View Post
Stupid question time: what if the two rear lines were switched at the master cylinder, how catastrophic would that be?
Once again, thanks fdryer:
Quote:
Originally Posted by fdryer
the brakes are physically split into two separate diagonal brake systems from the master cylinder making the right rear/left front one side and the left rear/right front the other side. Not the fronts as one half and the rears the other half. Having split the brake system into two diagonals has always been this way.
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Old 07-28-2019, 10:35 AM   #11
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Default Re: Length of brake line

If you had ABS, swapping the lines would be bad as the system would let up on the wheel with the most traction.

...
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Old 07-28-2019, 12:17 PM   #12
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Default Re: Length of brake line

The ABS is cheap tri-channel, not quad channel. Fronts can be turned off individually but the rear is turned off as a pair so swapping the lines has no impact.

I understand the concept of the diagonal hydraulic brake setup but all it does is make bleeding harder than it should be...once there's a hole in any line you have no brake pressure without the parking brake. If it were a proper front/rear setup you'd only have to jack up the car once to bleed, not 2+ times.

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Old 07-28-2019, 12:20 PM   #13
Jbear
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Default Re: Length of brake line

Quote:
Originally Posted by Goggles Pisano View Post
Once again, thanks fdryer:


The search box is your friend.
I've seen the diagrams of the brake lines in a diagonal configuration, and another diagram where they are not. Mine are not. But I don't know if they're still set up RF/LR, LF/RR, or not.

The one I just replaced runs from the driver's side left of the MC/PV down under the dash/firewall, across to the front right (passenger side) wheel. It's a little hard to trace, most of the line isn't visible, it's tucked up above and behind things. The rear passenger side runs down the driver's side alongside the driver's side rear line, then near the rear wheel it bends and runs across to the passenger side. I replaced the part that runs across not long ago. I'm replacing both driver's side lines in a couple of days, and probably the remaining steel portion of the RR line.

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Old 07-28-2019, 12:25 PM   #14
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Default Re: Length of brake line

Quote:
Originally Posted by Waiex191 View Post
If you had ABS, swapping the lines would be bad as the system would let up on the wheel with the most traction.
Having a discussion with the father-in-law as we install these brake lines. It's an SL1 with no ABS, but he wants to not have them diagonal, with his thinking that if brakes go out the car would want to snap into a spin. I'd rather keep it the way it is, thinking the car would pull violently to one side or the other doing it that way.

I don't anticipate having brakes going out like that in my future which is why we're doing this work, but still. Also, wouldn't it throw off the order of brake bleeding?

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Old 07-28-2019, 12:49 PM   #15
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Default Re: Length of brake line

Quote:
Originally Posted by Goggles Pisano View Post
Having a discussion with the father-in-law as we install these brake lines. It's an SL1 with no ABS, but he wants to not have them diagonal, with his thinking that if brakes go out the car would want to snap into a spin. I'd rather keep it the way it is, thinking the car would pull violently to one side or the other doing it that way.

I don't anticipate having brakes going out like that in my future which is why we're doing this work, but still. Also, wouldn't it throw off the order of brake bleeding?
Your father in law needs to rethink things. Dual diagonal system.

One front and one rear on the opposite side are on a circuit and the other circuit is the other front and and other rear.
This means that if one circuit goes you will get, in theory, even braking on each side rather than all of the braking on one side of the car.

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Old 07-28-2019, 01:01 PM   #16
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Default Re: Length of brake line

The diagonal braking - as I had it explained.


If the front brakes were on one side of the MC and the rear were on the other - if your brake differential light went out - if you lost the rear brakes first ( more likely too as the rear lines rust out first) you would still have 90 percent braking - and you wouldn't be aware of it. Or if the front went first - you would only have 10 percent braking. If you then lost front you have zero braking.

However- with diagonal -- you will always have 50 percent braking should one side fails - and you WILL be aware there is a problem.

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Old 07-28-2019, 02:50 PM   #17
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Default Re: Length of brake line

Quote:
Originally Posted by onlinebiker View Post
Ok..thanks.

Didn't know they had one. So is it adjustable, or do they have two MCs for drum vs disc rear?
Same MC for both disk or drum rear.

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Old 07-28-2019, 03:35 PM   #18
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Default Re: Length of brake line

It was a moot point anyhow, because if he was going to accomplish that, he would've remembered to switch the fittings to the master cylinder!

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