Topic: Rear brakes won't bleed. ??

[Yota Up]

85 pickup.

Did some work on the rear gears a while back.
When I did, I disconnected both brake lines at the T on the axle(because the nuts at the wheels were too rusted).

Put it back together and pedal goes to the floor.

Front brakes and LSPV all bleed fine. But both rear wheels don't bleed at all. When you open them, the pedal doesn't move down and barely a drip comes out.

If I disconnect at the T again, I barely get a drip. It's like there is a plug between the LSPV and the T at the axle, or perhaps before the LSPV.

Any ideas?  There are ZERO leaks anywhere. No visible kinks. I've tried bleeding with the LSV arm up and down already.

PS: The rear line is looped up and over from the LSPV before going down to the axle, could that be it?

Picture to show the "loop" and the way the LSV is tucked up under the bobbed bed:

I got a friend that has a spare LSV for me, but do you really think that will solve the problem? After all, it bleeds just fine at the valve.  Maybe one of the lines going "into" the LSV?

I'm stumped, and I've been searching and reading for 5 days now.  I see people replacing everything, MC included.  I'm sure some of you have had this very same problem.  Please let me know what your cure was.

Thanks.

[Yota Up [OP]]

Oh, and which of the 2 lines going into the LSV is the one that feeds the rears?
Maybe if I disconnect it before and after the LSV I can pinpoint where the jam is.

[Doof]

did you get it figured out?

if not try a new Master Cyl

when i did my sas my breaks were tits, after they went to . and it turned out that after about 5 or 6 months of running and fighting my breaks the MC was . now with a new one they are just like new

[yotadork83]

have the same problem in my 94 please help!!

[abriel68]

i have an 85 4runner and my brakes are real spoungey, they'll stop me but they dont stop as fast as i'd like to, i've blead the brake lines many times now and they still dont stop like i want them to. i had 39.5's then i went down to a 35" still had the same problem, im goin back to a 39.5" and was wondering if its just the tires or my brakes, if i can get a few opinions that would be great, thanks

[jimbo74]

i have an 85 4runner and my brakes are real spoungey, they'll stop me but they dont stop as fast as i'd like to, i've blead the brake lines many times now and they still dont stop like i want them to. i had 39.5's then i went down to a 35" still had the same problem, im goin back to a 39.5" and was wondering if its just the tires or my brakes, if i can get a few opinions that would be great, thanks

i am willing to bet its jsut an inadequate system.... thats a good size tire on the marginal at stock brake system......

i run stock brakes on my 84, and they suck...... anything heavier or larger, and they would suck donkey nuts

[abriel68]

what do you suggest going to a larger brake caliper? thats what i was thinking, the tires are real heavy, im down shifting everywhere and i know that im gna have to get a new clutch or adjust it pretty soon if i keep at this. thanks.

[jimbo74]

dual diaphragm booster, gm master cylinder, ifs rear axle with bigger drums, vented fj60 rotors, v6 ifs calipers


the list can go on and on.......

[abriel68]

thanks

[jimbo74]

get rid of the plsv, by using a standalone proportioning valve....

possibly running disks in the rear......

[abriel68]

yeah 4wheel disks would be sick,

[SteveB]

My brakes used to suck . I put a new master cylinder and brake booster and now it stops on a dime Of course im only running 32's

[bloodsweatbeers]

I had the same problem as Yota Up.  It didn't matter what position the LSV arm was in, I did not have any pressure to the rear brakes.

Solution:  I took out the LSPV.  Now the brakes are awesome, but the rears are still drums so they will lock up before the front disks.  This could be dangerous under low traction situations.  I am now going to add a standalone proportioning valve.  At some point I will go to rear disks. 

[yota_krawler]

my brakes sucked too for a long time. I put new calipers on the front, (stock 85) running 91 4unner drums in the rear (no ebrake at the moment) and put a 15/16s master cylinder. bled the s&%t out of em and they honestly work awsome. I cut the bar that goes from the axle to the lspv (as close as I possibly could) I am running 37s. I can stop in a hurry!