All you brake afficionados...

Man, it has been a LONG tike since I posted in here.. glad y'all survived the Rona.

So 2014 Tundra. New pads, calipers, rotors x4 about a month ago. No issues. Over the past few days I've been losing pressure when I'm stopped at red lights etc. Have to pump the pedal or just put in P because it'll eventually start rolling forward. Don't see any leaks anywhere, not sure of it's the master?? Don't think it's the booster because it depresses, so....

Questions comments concerns?
Thanks, guys. Appreciate you

 

Sounds like a leak in the master cylinder. Sometimes they can show signs of a leak on the inside of the cab where the stop light switch is.

 

Roger, I'll check it out.
Thanks man...

 

Upgrade time

 

I concur with Johnnyskullface. That seems to be a likely solution. If there are for sure no leaks, and you aren't losing brake fluid, could be that your master cylinder seal is maybe faulty?

 

yyyeah that's what I'm assuming. I pulled as much into the system from the reservoir as possible and it's still sinking at red lights so I'm gonna have to get underneath it and take a look.

...and then just go ahead and get that Wilwood setup. Because upgrade.

 

There's a TechStream process to bleed the ABS system if you think you got air that far up. Did the Master Cylinder lose all fluid?

I'd double-check that you don't have air in the system.

 

The reservoir was a little low but I can't remember the last time I filled it and I just had my brakes done so I'm thinking/hoping that there was just air in the line. It seems like it's getting better but I've only driven a little since yesterday..
We shall see......

 

Brakes are one of those systems that I like to think we all appreciate working properly?

 

Won't get better on it's own if there is air in the system. Consider purchasing a power bleeder such as the Motive with one of these https://smile.amazon.com/gp/product/B004IQ96RK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

Normally when brakes are done there is no need to crack any lines that would allow air in the system. Also, if you can pump it up and it gets firm and then over time keeps sinking its not likely air in the system. Air in the system will be spongy all the time due to the air being able to compress more than the fluid. It would be an easy thing to double check for air in the system, but don't bank on that being the issue.

 

He replaced calipers.

 

Bleed them. Right rear, left rear, right front, left front. Then the master cylinder lines.

 

This! Bleed the system. Tap the calipers with a rubber hammer. Air bubbles get trapped. By driving, you may have knocked some loose.