Do you have to bench bleed a stock master cylinder if you take it off?? And how do you do it?

Thanks,
Benji

 

Yes, chances are you've introduced air into the system.

 

I can't just bleed the brakes after I put it back on the car?

Thanks,
Benji

 

since the master cylinder is mounted at an angle, there is no way for air to escape from the highest point inside the master cylinder, so the only way to properly remove all air is to get the master cylinder, at least level with ground, hence taking it off and bench bleeding

if u can put the car on a hill and get the master cylinder at least level then u can get away with it

 

The master mounts at an angle. There is a chance that it will not pump all of the air out with a normal brake bleed.

Bench bleeding is just attaching two lines to the MC output and bending them back into the reservior below the fluid level. Then you hold the master level in a vice and pump it with a rod until all of the air is out of the MC ie no bubbles.

That is a bench bleed.

Z28

 

What kind of lines do I attach? What do you mean bend them back into the reservoir below the fluid line? I think mine is bad, and I was just going to swap mc's off another f-body to see if that is my problem. Is the bench bleeding too time consuming to mess with doing this? I appreciate all the replies.

Thanks,
Benji

 

I am going to answer this but I shouldn't, you can figure this out if you think about it. Rely on yourself as much as you can, you will learn the most that way and you won't get bad info.

You can fab some lines from 3/16 standard brake line. They have to thread into the master cylinder ports and seal. Some new master cylinders come with plastic fittings and some plastic lines for this purpose.

The free end of the lines that you fabbed must be in liquid rather than air to allow you to see bubbles and to prevent air from getting back in. The easiest way is to bend the free end of the lines so that they go into the brake fluid in the master cylinder reservoir. That makes it a closed loop.

If you don't bleed everything properly the whole job is a waste of time. How long it takes depends on how well you do the job. Should take less time than this follow up post took for me to write.

Good Luck

Z28

 

I appreciate it. I understand now what you were talking about. I just wasn't following. Sorry.

Thanks,
Benji