Master cylinder leaking....need to fix....help

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moloss

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I have a 2004 v8 limited and the master cylinder is leaking....i have identified the leak as coming from the piston (leaking slightly but still leaking) i ordered a $55 kit to fix this.....that said i've never done this before and have been trying to find a write up....anyhow the local toyata place wants $3200 to replace the whole thing when i really thing it just needs a new o-ring.....anyhow any help is appreciated....thank you
 
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moloss said:
I have a 2004 v8 limited and the master cylinder is leaking....i have identified the leak as coming from the piston (leaking slightly but still leaking) i ordered a $55 kit to fix this.....that said i've never done this before and have been trying to find a write up....anyhow the local toyata place wants $3200 to replace the whole thing when i really thing it just needs a new o-ring.....anyhow any help is appreciated....thank you[/QUOTE

Below is a PDF file for overhauling the master cylinder.

Step #15 is the step that you need to do to remove the master cylinder piston which is where you have the leak and need to replace the o-rings and or seals, etc., then step #47 is where you reinsert the piston in to the master cylinder.

There are many other steps in the document that you don't and or shouldn't have to do since your issue is a leak from the piston/cylinder of the master cylinder.
Click to expand...
 

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brake booster oring??

moloss said:
I have a 2004 v8 limited and the master cylinder is leaking....i have identified the leak as coming from the piston (leaking slightly but still leaking) i ordered a $55 kit to fix this.....that said i've never done this before and have been trying to find a write up....anyhow the local toyata place wants $3200 to replace the whole thing when i really thing it just needs a new o-ring.....anyhow any help is appreciated....thank you
Click to expand...

i have the exact same problem, please record or video or take lots of pictures, should you go ahead with the repair, i changed the accumulator+oring a couple of months ago, it didnt resolve the problem.
do keep me in the loop

is this the part you bought??
 

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  • 4runner brake oring.jpg
    4runner brake oring.jpg
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earthrealm said:
i have the exact same problem, please record or video or take lots of pictures, should you go ahead with the repair, i changed the accumulator+oring a couple of months ago, it didnt resolve the problem.
do keep me in the loop

is this the part you bought??
Click to expand...

The PDF I posted above is the one I mentioned in your topic/post of your issues, I was looking for your post to post it there as well, so I'm glad you seen this topic so you have the file to help you with your's!

It took me a while to find the PDF on my computer, and then figure out how to post it.

I have CRS (Can't Remember Shit) so I'm glad I don't have to keep looking for your post since I can't remember the topic!! LOL
 
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AuSeeker said:
Here's 2 different sources for the part/kit you should need, be sure to enter your year model. etc. to be sure they also fit your year model, these links do fit my 2004 model.

04493-60350 - Toyota Parts Deal)

Overhaul Kit - Toyota (04493-60350) | Toyota Parts
Click to expand...

Just checked, seems 05 runner brake booster does not use that part, being that the brakes are different for 05 to 09 and 03/04,
now am really stumped, as am yet to see an 05 upwards resolve this internal leak problem
 
earthrealm said:
Just checked, seems 05 runner brake booster does not use that part, being that the brakes are different for 05 to 09 and 03/04,
now am really stumped, as am yet to see an 05 upwards resolve this internal leak problem
Click to expand...

I would check your build date, if you have a very early 05 the master cylinder maybe the same as the 04s, my source lists 2 different master cylinders for the 05 and one of them is the same as the 04, but only one for 06 and later, you may want to contact an online dealer and give them your VIN and see if that overhaul kit work for yours.

I haven't found one for the later models, but I will keep looking when I have some more time.
 
AuSeeker said:
I would check your build date, if you have a very early 05 the master cylinder maybe the same as the 04s, my source lists 2 different master cylinders for the 05 and one of them is the same as the 04, but only one for 06 and later, you may want to contact an online dealer and give them your VIN and see if that overhaul kit work for yours.

I haven't found one for the later models, but I will keep looking when I have some more time.
Click to expand...

mine is oct 2004, checked with an 04, my brake master cylinder is different
 
Ok so iÂ’ve been on vacation (got home yesterday) decided itÂ’s time to tackle this.....I get under the dash on the drivers side thinking iÂ’ll take off the 4 nuts and disconnect from the brake pedal.....easy peasy.....nope I canÂ’t even get any of my wrenches on the nuts.....there is no room....iÂ’mnot a big guy but letÂ’s just say I barely fit never mind I canÂ’t get a wrench on anything.....ideas?
 
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moloss said:
Ok so iÂ’ve been on vacation (got home yesterday) decided itÂ’s time to tackle this.....I get under the dash on the drivers side thinking iÂ’ll take off the 4 nuts and disconnect from the brake pedal.....easy peasy.....nope I canÂ’t even get any of my wrenches on the nuts.....there is no room....iÂ’mnot a big guy but letÂ’s just say I barely fit never mind I canÂ’t get a wrench on anything.....ideas?
Click to expand...

what did you finally end up doing
 
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