90xtra

I have twice lost a line which resulted in TOTAL brake failure. I have heard of this happening to other people.

Is this a defective LSPV or a defective design?

Thanks!

space-junk

iTrader: (1)

no, its cheap parts or incorrectly installed parts...

abecedarian

Knowing which line might help.

desertcamper67

Does your truck have a lift?
Did you extend your brake lines?
Do you wheel it?

the_ocho

both of the lines that run from the passenger front to the rear of my truck have blown out from rust and age. the PO had installed them into the wrong ports on the LPSV so i had no rear breaks when i got the truck till i moved the ports around.

abecedarian

So that means that the front brake circuit was directly operating the rear brake circuit?

the_ocho

well the port out of the lpsv to the axle had one of the Lines form the front plugged into it and the other line from the front was in the correct spot and the line from the axle wasn't hooked up to anything, i dont remember who it was maybe it was you abe who helped me with that, MN winter with only front breaks was fun

the_ocho

Actually it was you Abe, Thanks again you always seem to be the one to help me, rear breaks and then my TPS last night, Your the best

abecedarian

don't remember.
anyhow, it's better to have only front brakes than only rear brakes. when wheels lock up, the vehicle tends to follow the locked wheels. so imagine if the rears locked up: the vehicle would 180 rather rapidly. found that out when I was 7 and was in to legos.

the_ocho

yea but loosing steering isnt the best either.... i got real good at letting off the breaks in order to stop lol

abecedarian

Isn't that how anti-lock brakes work?
When wheels lock up, they release the brakes so you can maintain traction, no?

the_ocho

Anti-lock breaks, whats that? lol i havent had those since my F150

abecedarian

lol. I know you know better.

But that's why 1st gen anti-lock brakes on trucks only worked for the rear: keeping the rear from locking up means that only the front will lock and the vehicle will not spin out of control... though it might 'slide' out of control, releasing the brake pedal should allow the front wheels to gain some traction and let you steer a bit. More advanced ABS can control the brakes on each wheel independently... but that's not for our trucks.

the_ocho

The rear anti-lock never worked for me probably because of the ports being messed up by the P.O. I just pulled the light out of the dash a few weeks ago when i did my L.E.D. conversion. im not worried about it, I'm so O.C.D. when i drive, all my friends think i need to relax. i guess thats why im the only one who hasn't wrecked a car( on road that is. iv done my fair share of totaling trucks off road haha) or ever been pulled over for a moving violation. just my damn stereo haha

drew303

You might consider replacing the LSPV with a manual one and replacing all the break lines (just need a flare tool). Something to consider if your lines are rusted out.

They are notorious for rusting out over the gas tank, mud/debri builds up there and burries the lines which holds moisture around the lines... ie rust.

Would be a tedious job but considering your brakes can be your life, one worth doing IMO

RobD

I had the rear line on mine go a few weeks ago due to rust and debris. I pulled the LSPV out (so if you need one, let me know and I'll let it go for cheap), pulled both front and rear lines that ran back to it, capped off the front line and ran a new rear line.

Now I can get my rear ABS to engage on dry pavement. Something I never, ever felt before.

90xtra

First time was compensating line (Backwards, into the trees) .

Second time is right rear. (Frontwards into the Shop door)

No-one else has experienced this?? I guess it has to be a bad LSPV or master.

Wilwood prop valve for me!

Thanks!!

90xtra

Turns out that:

1. I hand a slow leak in rear.

2. The front master piston fluid uncovers from fluid resevoir first, when level is low.

No fluid in front, leak in rear, equals total brake failure.

Never noticed a degradation in brake performance

Dash brake light is paralleled from BOTH master cylinder level switch and park brake off switch. Light's been lit from parking brake for awhile. I used to push the handle in, after awhile I ASSUMED it was the parking brake, and ignored it.......

Lesson learned: maintain the dash light and believe it.

Hope this helps someone.