Brakes Brake opinions

Wayne Waldrep said:

Mine did something similar once and it ended up being the check valve. Have you checked that? That sounds strange.

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Didn’t even think about it. I’m looking into it now to find a way to test it. I will let you know if it ends up being that!

General karthief said:

It really sounds like the master cylinder is going bad to me.

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Forgot to mention I was going to replace the booster and the master cylinder just to be sure. I don’t play around when it comes to brakes after I had a booster go out on me on the road. But anyways, I got the booster now and once I track down the master cylinder I’ll replace them and post an update.

So I got the new master cylinder and boaster in. I bled everything and then realized the pedal was still only getting pressure in the lower portion of the movement. I researched and found out I made the scrub mistake of not measuring the booster rod... I’m assuming that is my problem because I can play with the pedal and my assistant says the brake fluid doesn’t move until more than halfway down the pedal movement.

So my question now... do y’all think I could get this rod adjusted with out disconnecting the lines again?

Update: I can’t seem to get the brakes bled out..
so I opted to not bench bleed and just bleed the whole system out while on the car. I did this and got fresh fluid on all bleeders. After that I still did not have enough brake pressure and that’s when I realized I should adjust the booster rod.
So I did that and it still didn’t feel right. I decided I was tired of messing with it and was willing to have a shop bleed them for me with a pressure bleeding. Did this and they were way better but I could still put the pedal to the floor and not lock the wheels up. The brakes weren’t building pressure or getting hard even though it was able to stop itself.
So I figured I just needed to adjust the rod at home since the brakes were bled. But now even with the rod maxed out I still can’t get the pedal to not go to the floor and brake correctly.

Before I take it back to the shop or trade this car for a new motorcycle what do you guys think?

Mustang5L5 said:

If you didn’t bench bleed the MC, the angle it’s mounted at traps air at the front.

Either jack the rear up so it’s level and hope all the air gets purged, or bench bleed it

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Do you think that even after the shop pressure bled the system there would still be air in the master cylinder?

Update: brakes are a lot better now after the master cylinder was bled but still feel weak and can get the pedal to the floor. Next is to replace these rotors. They are pretty bad with a lot of heat cracking so hopefully I see a big improvement with the new ones.

Yes it does get hard with the car off. The pedal feels strange right now when the car is on.
It’s super soft but the car brakes fine. The only problem is how “light” it feels and it goes to the floor. It’s hard to describe but it doesn’t have the same air feeling that I’ve had before.
I’ve had a shop pressure bleed it three times now and bench bleed the master cylinder now so I’m going to see how new pads and rotors do.