Falling brake pedal

Alright. So I have had this problem I'm pretty sure the whole time I had the truck. (Since 2017) so I recently replaced my drums September 19th. In the process, wd ruptured a brake cylinder and picked up one, and obviously had to bleed brakes. MC never went empty. About a month ago, I was in Vegas and noticed my e brake didn't catch. At all. Adjusted the drums fully, and now it'll be hard on initial application after driving a bit, but after I stop it'll fall to the floor. Also when I left go, I feel like the rear brakes kind of let go a bit late. And if I'm in park, even with pumping, the brake is soft af. Bleed all 4 points with engine running and no air in system. Also, I can hear a hissing each time brakes are applied near the abs module, and inside the brake line that goes to the rear left brake (the cylinder we replaced). Could the module be bringing air into the system?

 

I’m about to replace all my brakes. Curious, don’t know that it’s related, but what brake fluid did you put in when bleeding?

 

DOT 3. That's it. Brake fluid is brake fluid other than that.

 

Maybe, I wasn’t looking for brand. I know 5.1 is recommended due to boiling point being higher than 3.

I don’t know about the hissing, but my pedal is spongy and the LSPV is already adjusted near the top on mine.

As much as it might suck it might be worth getting it jacked up again and in position so you can see/hear what’s happening better.

My, inexperienced, thoughts.

 

In order bleed:

1) Pass rear 20-25 pumps

2) LSBPV 15-20 pumps

3) Driver rear 15-20 pumps

4) Pass front 15 -20 pumps

5) Driver front 15 pumps

I bleed mine with truck off and board under brake pedal.

 

How many times did you have to fill the res during a full bleed?

 

How do you bleed the LSBPV? I've seen / heard people adjusting it ... I've never touched it yet

 

It has a bleeder valve on it, same as any brake.

 

About every 10 pumps to be on the safe side. Maybe 15 max.

 

Same a wheels. You might have some gnar gnar up it there.