4rnr

My master cylinder worked fine, I did a sas, bled the brakes, I never put a block of wood under the pedal. I pumped it probably 500 times in my attempts to bleed the system. Did I over extend the piston too much. I cant get the brakes to hold pressure. Even if there was air in the lines the pedal would compress the air and then hold the position. but all it does is pump up firm and when you hold it it falls to the floor.

Its a 92 4runner v6.

I am thinking about upgrading to the fj80 MS but not sure if its worth money.

Also to bleed the cylinder I just run two brake lines out of the outputs and into the resivoir, and pump the piston until no air bubbles come out of the res. Is this all there is too it. is there something I have to do to keep air out of it as I install it?

Thanks guys Im in a hurry

4rnr

Actually I just checked with car quest and the fj80 part # is the same part# as the 92 4runner MS so no upgrade necessary....I guess

midiwall

Yeup... you have to hold the pedal down to the floor as you close the bleeder valves. If you don't, then the action of the pedal going up will suck air into the line.

Get a buddy to help, or pin the pedal to the floor with a 2x4.

4rnr

Bleeder?? Im talking about the master cylinder I wasnt aware of bleeders (that would be nice) Im only aware of the two fittings, Ill double check.

breknraj

Or get a manual vacuum brake bleeding pump/resevoir - I love having mine for changing fluid and bleeding the brakes!

4rnr

Whats that? do you have a website or a place I can look at it

breknraj

I bought mine through Griot's Garage:

http://www.griotsgarage.com

Item # 10122

I got this one because it's big enough to use for just about any fluid drain/transfer, but I've seen smaller (and cheaper) versions in other catalogs and auto parts stores - just look around, or search on eBay.

4rnr

Thats interesting is there a manual verison.

4rnr

what kind of blleding to I have to do after I install the master cylinder. Im sure there will be air in the lines, do I bleed the same way and drag all that air through the system, or should I reverse the bleeding order, or is there a better way. Im finding that there a million tricks to doing this.

Elvota

I use this for all types of bleeding, applying vacumm...

http://www.harborfreight.com/cpi/cta...emnumber=39522

I've seen this unit and similiar ones elswhere. Usually at auto shops.

In a pinch one time, I bought a huge (1" dia, 6" long or so) syringe at a pet store, and used this to pull fluid through the lines. Was slower though, but a lot cheaper.

midiwall

Hmmm, I may have gotten our wires crossed, but I've also known to bleed the system through the lines even when replacing the master.

Maybe not...

breknraj

#10122 is the manual pump. Go to the web link, seach the item number, and there is a good picture of it on the top left.

Capacity of the res is about 1 1/2 to 2 gal, an it stands a couple of feet high. VERY handy tool to have around!