justsobuff

Ok so kinda a newbie to wrenching... But brother is a mechanic for 28 years but lives 700miles from me... anyways i have picked up some stuff here and there from watching him... Ok so i have a 88 yota... but the other day found a 86 yota power everything and sunroof ... great truck !! engine good and everything and stole the thing for 400$ but the guy said needed new brake line... so crawled under there and replaced the line from front to back paportion valve thought i was gravy started to pump the brakes to bleed and blew the other line out... so now both lines running to the back are replaced. So and the rear wheel cyclinders . crawled under there had the wife pump pump pump till got stiff and hold the pedal down.. then i opened the bleeder valve then closed it and she let go of the pedal... so after a hour of doing this still seeing air bubbles in my tube when bleeding... ????? very lost here.. front ones great... even releases when i open the valve on the front ones... But yah back ones still nothing and still seeing air tube... any ideas ??? or am i bleeding it wrong? i have seen another way to do it. ( open the valve press the brake... close the valve release the brake...


anything would help..

Thanks

abecedarian

bleeding procedure is right rear, left rear, right front, left front, proportioning valve.
You're doing that, right?

justsobuff

My brother said he goes drivers side front passenger rear. Buy I'll try your way. Really need to get a brake bleeder

abecedarian

Usually you start farthest from the master cylinder and work closer so that as you move from wheel to wheel you've already moved as much of the air out as possible leaving shorter tubing to deal with. The proportioning valve is the "wrench in the works" since it is connected to both the front and rear brake circuits. That is why is should be bled last.

'cause technically, the bleeder on the proportioning valve removes the last of the air from the front brake circuit.

desertcamper67

Load sensing valve by spare tire needs to be bled. If that's what is being called proportioning valve it doesn't tie into front brakes.

Matt16

I bleed in no particular order and it seems to work fine.

abecedarian

Better check your lines out.
One line comes from the rear circuit of the master cylinder, another tee's in to the right front brake line and the third drops down to a tee on the rear axle.

It's a Load Sensing Proportioning / Bypass Valve. LSP/BV. It directs full brake pressure to the rear wheels if the front circuit fails.
Have a look here: http://autoshop101.com/forms/brake08.pdf

wyoming9

iTrader: (1)

It is possible you have one of your newly replaced lines just loose enough to suck in air while trying to bleed them

mick cassidy

im pretty darn good at brakes ok the wife pumping the pedal will piss the wife off !!! buy a $100- vacula bleeder if you got a rig u gonna need some tools to work on her ...
yes right rear left rear right front left front always bleed furthest caliper first from the m cyl ...
and buy the vacula quart jug to hold fluid as nothing worse than bleeding it an then running out of fluid ouch duhhhhhhhh