I can't seem to get the clutch line bled on my 94 4runner. I changed the MC and slave. (I did not bench bleed before installing) about 3 months ago, bled the lines and it was fine. 3 weeks ago, pedal started feeling mushy, had to pump to get in 1st. Bled again. and fine. The last 3 days, OK but mushy. Then today it goes to the floor. Bought the mightyvac vacuum pump, used it , nothing. Gravity bled, nothing. well, not exactly nothing. I can pump the pedal and have pressure, if I pump and hold, the pressure holds, but as soon as I let up a tiny bit the pedal pulls away and sinks to the floor. Do I just need a new master? It would be the third one in as many years.
Thanks

 

Did you bench bleed the MC?
As in, no air in the master cylinder before installing

 

the masters fail vary common. It is not unheard of to replace one every year or so. truley the best recommendation is to rebuild it with better seals.

personally I find dealing with the master so irritating I have simply left my leak master in and fill her up when needed. mine has been leaking sense 2003.

 

I found out about the bench bleeding since installing. Is it likely I've blown the seals? I will definitely bench bleed the new one. I don't see any leaks around the MC or SC.

 

This is funny I have changed a few of these things and have a few new ones sitting on the shelf.

I have never bench bled any of these ever.

I am thinking you have a bad connection allowing are to be sucked in but so slight as to have a very slight leak.

I have used all different brands of rebuilt and new so that has not been a issue as to one brand over another.

Go figure

 

I've had tons of Toyotas and never had to replace a MC unless upgrading. If you do replace go OEM Aisin.

:wabbit2:

 

I was wondering about the difference in brands. I've seen the part online listed for anything from $27-$110.
The small leak idea makes sense, guess I'll grab some teflon tape too. swapping it out in a bit, I'll update.

 

Thanks Wabbit, despite the price difference I was thinking that is what I would do. You usually get whatcha pay for.
What is the difference anyway, better seals?

 

Just higher quality parts.

 

Ok, new Mc bench bled, installed and lines bled. vacuum pump works great. http://www.harborfreight.com/mityvac...ump-39522.html
wasn't able to get the OEM cuz it's sunday and I need this baby tomorrow. Put a Brake Best on for now and ordered the OEM online for later.
This is the first thread i've ever started, usually the answers I need are already posted. Thanks for the help y'all.

 

Between the Aftermarket parts, and not bench bleeding it, you have your problems.

Get an OEM Aisin master (can get them through aftermarket suppliers for cheap) and bench bleed the master. Gravity bleeding doesn't work very effectively, and the vacuum pumps work OK. I use the pedal pump method after the vacuum method to be sure I have all the air AND old fluid out of the system.

Its amazing what just some new fluid can do.

 

Why then do I have no problems ??

I have Never bench Bled any of them.

I used all different brands I just change them when The slave cylinder goes.

We are talking about vehicles that are all 20 plus years old

Given a choice I would buy The Toyota ones but that is not always a option