Possible Master Cylinder Issue

[spyke01]

Sometimes when i'm driving and I brake the break pedal will hit its stop and then slowly sink to the floor. I have to release it and pump it again to stop. This will also happen at a full stop sometimes. I did some searching and it looks like it could be an internal leak in the master cylinder.

What do you guys think?

 

[Deadswitch]

sounds like a bad master cylinder to me

 

[Deadswitch]

also just to be eliminate another possiblilty, i doubt this would have anything to do with it tho, make sure you have enough brake fluid in the bowl and bleed you brake system starting from the rear passenger side, to rear driver, to the front 2 brakes. Again i dont think that is the problem but it doesnt hurt to try.

 

[spyke01]

If i do a bench bleed on the new master cylinder will i have to bleed all the lines again as well?

 

[Deadswitch]

If i do a bench bleed on the new master cylinder will i have to bleed all the lines again as well?

Yes

 

[Deadswitch]

well its always safe to just do it

 

[Deadswitch]

plus it only takes like 15-20 mins to do

 

[spyke01]

Do you guys have a link to the bleed process, this will be my first diy brake job

 

[Deadswitch]

Do you guys have a link to the bleed process, this will be my first diy brake job

basically its a 2 man job, one guy pumps the brakes till they stiffen and he then holds the brakes. The other guy bleeds out the line, repeat the process till no air comes out the lines, just fluid.... done deal

 

[2NRSTV]

You can get the one-man bleeder kits at a local auto-parts store. There like $10 I think.