Brake Master cylinder 2008 Tacoma

Hey guys and gals!
Started having spongy brakes. I can still brake and at times they vary in their sponginess.
Bled all brake lines at the wheel twice, replaced the front brake pads(just to trouble shoot they looked fine), back pads were fine. Have not had any drop in my brake fluid so I am 99%sure there is no leak also noted there is no fluid under the truck ever.
All that being said, I'm going to attempt to replace my master cylinder as my research tells me that is the culprit. It is pretty accessible and my friend is encouraging me to try it myself. Any warnings, encouragements, tips would be appreciated!
2008 4x4 TRD v6 4L

 

When you bled your brakes did you do a full fluid flush, or did you just bled them? Brake fluid is hydroscopic and will absorb moisture out of the air. This will change the performance of the brake fluid and the feel of the pedal. If you didn't do a full fluid flush, I would try that before spending the money on a new master cylinder.

 

.......sub'd


EDIT: Found the following interesting....

http://www.tacomahq.com/1668/toyota-tacoma-drum-brakes-last-long/

 

Your gonna need a scanner to bleed the abs module. Make sure your rears are adjusted properly and no leaky wheel cylinders. Bench bleed the master before install. It helps to have a buddy help you once you bench bleed it to do the Indiana jones switcharoo. The less time you leave the lines disconnected from the master the less air you will introduce into the system.

 

Make sure also to adjust the vacuum booster to compensate for the new master or it will feel softer, or worse, drag.

It is critical to adjust the booster properly.

 

Hey thanks for all the replys. Would you guys recommend I just pay to have it flushed properly before attempting any big moves? I literally just ran about 1L of brake fluid through the system. No thing gritty came out, no sputtering(obvious air). That's all the videos online showed. But perhaps I should have it done by a professional.

 

Are your rear drums adjusted properly? You will have long pedal travel if they aren't

 

I haven't had any of them adjusted ever. But the brake pedal varies in it's response. It certainly is not consistent with its response. For instance I've noticed if I pump them they get better most of the time.