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Discussion Starter · #1 · (Edited)
Hi I just bought a 90 4runner v6 4x4 ... it's got 8" lift on 35x12.50x16

The previous owner replaced the master cylinder and I was sure they did not bleed it right because I have no brake pressure! Well I gravity bled front brakes and they are working... I did bleed the lspv ( which is no longer mounted on axle) it is possible there is more air in there but I can't get no fluid to rear wheels at all! I have to press pedal to floor to get any brake pressure for the truck to stop.

Any ideas on what I can do? I did gravity bleed lspv first and fluid was steadily coming out and then a buddy pushed down while I opened and then off when I closed it....

Any help would be great before I run someone over.

oh yea and rear ABS light is on.. rear end has been changed i have no clue if it's the stock one or not :(
 

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Try bench bleeding the master cylinder.

Reroute the fluid back into the reservoir until all the air is bleed out.

A google search will turn up many hits on how to do this.
 

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Discussion Starter · #3 ·
Try bench bleeding the master cylinder.

Reroute the fluid back into the reservoir until all the air is bleed out.

A google search will turn up many hits on how to do this.

if I'm gettin fluid to any wheel then the master is working properly..?
 

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rock crawler
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Well it's at least working a little.

Bench bleed the MC (and this can be done on the vehicle if you have a second person to work the pedal).
Then bleed the brakes again properly. Gravity bleeding won't do it.

Proper order is

LR
RR
RF
LF
LSPV - and you can disconnect and move the LSPV arm upward as far as it will go to get max flow to the rear.
 

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Discussion Starter · #5 ·
Well it's at least working a little.

Bench bleed the MC (and this can be done on the vehicle if you have a second person to work the pedal).
Then bleed the brakes again properly. Gravity bleeding won't do it.

Proper order is

LR
RR
RF
LF
LSPV - and you can disconnect and move the LSPV arm upward as far as it will go to get max flow to the rear.
I can't bleed them in order if I have no fluid going to the rear wheels.... My problem is deff in the LSPV it is mounted alot higher than stock but I also have a Lift . I've tried gravity bleeding, I've tried opening bleeder someone pushes pedal down i close bleeder they come up on pedal ..and I did the pumping then opening bleeder I did all of this for like 6 hours today... I can get fluid from LSPV, R/F,L/F when I have someone inside pushing pedal down as i open and coming up after i close ... there just seems to be so much air in the system
 

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Discussion Starter · #6 ·
ok an update i just spent atleast 7hrs trying to fix these brakes!

Took master off and bench bled

bought a one man bleed tool ( no luck )

back to parts store spent $40 on a good vacuum pump, finally got some fluid out of a rear wheel..with alot of air I'm talking i was pumpin that darn thing for a good 2hrs and i got some fluid but alot of air

Is it safe to say the master is gone?
 
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