Ok- talking to the coefficient of anything is over my pay grade. But what I know is that my 15yr old hoses vs new the new braided stainless hoses I installed: the booster pump primes in measurably less time , 7-8 seconds faster- measuring priming time before & after install. Seems to me that the old hoses were weak and expanded more before system reached set pressure, new braided hoses resist expansion-which is one of the benefits of reinforced braided steel hose.
Stainless Brake Lines - SLEE vs the others (1 Viewer)
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Yeah.
Except this doesn't make any sense because the booster isn't pressurizing your lines. Those only get pressure when you press the pedal.
I have all the parts (with help identifying them from @JunkCrzr89 ) and will be rebuilding my calipers and sending the booster motor out for a preventative rebuild once the weather is less death (and hopefully before you are out here in Nov!)
Yeah, I think it's marginal when comparing new with new, but the stainless lines supposedly maintain that performance a lot longer when the rubber starts degrading.
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JunkCrzr89
Competent Ignoramoose
That’s always been my understanding of how a booster works, too.
Eyedaho
SILVER Star
That was why I asked about the pedal being depressed. If the lines to your calipers are pressurized, then your brakes are engaged. I was trying to figure out the shorter time to pressurize the accumulator.
Eyedaho
SILVER Star
I see what you did there...
Except - There is an established baseline system pressure, the pressure switch is looking to maintain which I believe includes the entire braking system all the way back to the rear caliper. Hear me out.
After you shut the ignition off, over time the fluid slowly returns to the reservoir and system looses some pressure. During key on process, the (electric) booster runs topping up the accumulator and simultaneously building system pressure to make ready for brake assist.
Now what happens when you open a rear bleeder during the key-on initialization process? With foot off the pedal, the booster would continue to run and pump fluid until you close the bleeder to allow the system to achieve its initialization pressure right? When the pump is running it's creating/achieving its preset line system pressure with out depressing pedal. It makes sense to me that a worn brake hose would not hold line pressure as well as a new hose, and that a rubber reinforced hose would not hold pressure as well as braided stainless hose. Stainless braided hoses have greater burst ratings than standard rubber hoses. It makes sense (to me) that they don't expand as much under pressure either.
I had no other explanation for why the booster primed faster after installing stainless braided hoses. I had no leaking fluid or fittings that might cause longer priming time. After changing 15yr old brake hoses out to stainless reinforced braided hoses - I measured the booster priming time was reduced by 20-25%. Having bled the system twice before in past years my priming time always was typically in the high 30 second range: (36~ 38 seconds), now its consistently 28-29 seconds to prime. I attributed this to stainless hoses holding pressure better than worn standard rubber hoses- since nothing else changed in the braking system.
IDK seems plausible to me, but I could be wrong.
How much pressure are you theorizing is the 'preset line pressure' here?
WHO sells just the rear extended lines for VSC, not slee?
Just an update, cruiseroutfitters just sold out. Slee is also sold out. So any leads on slee lines would be great.
how fast do you need them? any idea on lead time? I have a set on hand but I won't be digging in to the project until the weather cools off
Might be worth having a local hose shop fab a set for you, if you have the old ones just bring them in, they should be able to source all the fittings
jLB
Another one followed me home. Can we keep it?
I remember @2001LC mentioning some of the Safebrake lines, out of Australia, that he used. If I remember correctly he was fairly pleased with them compared to StopTech and Slee and they were available piecemeal/a la carte :
Installing SS Braided Brake lines, Flare nut stuck in pipe!
Guess I wont be upgrading my flex lines until they start leaking.
forum.ih8mud.com
They don't know when they will be in stock again. I'm not in a rush so i suppose i could look around at local shops. It's not a terribly complex part just need the added insurance after I got my lift.
trdcorolla
SILVER Star
He doesn't recommend them anymore. I went with SLEE.I remember @2001LC mentioning some of the Safebrake lines, out of Australia, that he used. If I remember correctly he was fairly pleased with them compared to StopTech and Slee and they were available piecemeal/a la carte :
Installing SS Braided Brake lines, Flare nut stuck in pipe!
Guess I wont be upgrading my flex lines until they start leaking.
jLB
Another one followed me home. Can we keep it?
Ahh I missed this post from @2001LC :
Replacing rear rotor and pads, anything else while it's off?
Getting ready to do my rear rotors and pads and ordering this kit: Power Stop Anything else I should order and replace while I'm at it? I assume (hope) this is going to be less of a pain than changing the front rotors?
forum.ih8mud.com
I guess that makes me feel a little better about the Slee brake lines, that I have sitting in the box for our 99 LX.
if the only reason you are replacing them, is because of your lift, you don't need to replace them unless you are one of the 5 people with the 1" longer icon rear shocks.
WOW, so disappointed in the lack of support for 100's compared to 80's. Is there no oem line that can replace these?
JunkCrzr89
Competent Ignoramoose
Yes, there are OEM replacement lines.
Sorry, extended I mean. If so part number?
Just got an email saying slee had them in stock.
