Brake Bleed, 85 4Runner, 4x4

[jssgbsn]

I didn't bleed MC first.

Do I need a 2nd person to bleed it?  I have a mightvac pump so I was hoping I could do it solo.

Here is what I did...

Suck out MC
Pipe taped bleeder screws
Bled new fluid and air thru in the following order:
Driver Rear
Passenger Rear
Passenger Front
Driver Front

Test drove...soft peddle.

Found out about LSPV tried to bleed and I got old fluid to come out, but I could not get new fluid to come through, then it just seems to suck air.  Double checked all bleeders and it doesn't look like any fluid is escaping, so I am guessing air couldn't get in.


Gonna do the above all over again making sure to bleed MC first.

So, can I bleed MC solo?  Mounted or bench bleed.  Seems most people say bench bleed MC first then do what I already did above.  Never bench bled a MC, anybody got a link or how-to on that?

Also, if anybody has used a hand vacuum pump before....I get it to around 10PSI, not over 20PSI.  That sound about right before loosening bleed screw?

Never had a problem bleeding brakes on any other vehicle in the past.

Any advice is welcome!  (Within the context of course  )

[jssgbsn]

Figured it out 

Used a MC Bleed Kit on it installed.  I just pressed the brake pedal slowly in and out about 20 times.

Then bled everything else in the proper order.

Everything is good to go.

(however, the LSPV never maintained full 'pressure/vacuum'.  I just kept pressure and it would slowly burp about 1.5" bubble.  Kept pressure and very slowly closed off the nut for the bleeder.

3 test drives later and everything feels fine.

Anybody got input on bleeding the LSPV?  I prob should eliminate it, but other priorites first.

[Rocksurfer]

http://board.marlincrawler.com/index.php?topic=93421.msg1047468#msg1047468

1. Drivers side rear
2. Passenger side rear
3. Passenger side front
4. Drivers side front
5. LSPV (Load sensing proportioning valve)(if you still have it)

If you look at the LSPV you will see three lines going to it, two in the front, and one in the rear. The one in the rear feeds the rear brakes. One of the lines on the front comes from the MC, the other is a return line the goes to a "T" for the front brake system. It is a bias line that changes the bias on the front brakes as the valve works up and down. That is why the front brakes still get air in them if you do not bleed the LSPV. The reason you do it last is the LSPV is the seconded highest component in the system and air travels up, hence the reason you bleed it last.

[Mtrdud]

I just bought a kit from Harbour Freight.  I havent tried it yet but I've heard good things.

[helipilot77]

When I bleed my rear brakes I always unbolt the two bolts for the LSPV arm and tie it in its highest position. This allows full bias to the rear brakes.

[jssgbsn]

When I bleed my rear brakes I always unbolt the two bolts for the LSPV arm and tie it in its highest position. This allows full bias to the rear brakes.

That's a good tip, thanks!

[Rocksurfer]

When I bleed my rear brakes I always unbolt the two bolts for the LSPV arm and tie it in its highest position. This allows full bias to the rear brakes.

Mine is bolted in the up position permanently.