Sup guys. The pedal on my 99 Tahoe (as seen in avi) went soft about a year ago due to a busted wheel cylinder on one of the rear wheels. I replaced the cylinder, bled the brakes, and got my pedal back for about 2 weeks, and then the pedal started going to the floor again.
Thinking that maybe the MC went bad after being ran dry for so long (I ran it dry for about a week when the rear cylinder went bad), I took it out and replaced it with a BrakeBest (O'Reilly store brand) MC. I bench bled the MC per the instructions, but while I was bench bleeding it, I noticed a geyser of brake fluid coming up into the reservoir for the front brakes (the larger of the two reservoirs). Thinking this was normal, I put the MC on, bled the brake system, and had no pedal. A little while later, I took the new MC back to O'Reilly and exchanged it for another one, bench bled, put it on, bled the lines - still no pedal.
So I took it to Just Brakes and got them to bleed the system, thinking that maybe I was missing something. They did their thing, got my $114 (I got an oil change too), still had no pedal, had the nerve to tell me that it was "just supposed to be that way" (the motto of the incompetent), and I went home defeated again.
Later, I exchanged the MC again for yet another BrakeBest MC, same story.
The fourth MC I have gotten is the one you see in the video below. This is an ACDelco, part no. 174-723, as prescribed by the Chevy dealer after a VIN lookup (but I got this one on Amazon for <50% of the dealer's price hehe ty men).
Anyway, watch and be amazed:
https://www.youtube.com/watch?v=9ivN2PztDK8
Every one of the four (4) master cylinders I have bought have done this. The pedal goes entirely to the floor and I have very little stopping power (takes about 2.5 car lengths to stop for every 10 mph, more if going over 50). There are no apparent leaks anywhere else in the lines - I think I'd have noticed if there was one because I've been under the truck about 6 times bleeding the sumbitch. The steel brake lines are in great shape. I live in Texas so the roads are never salted.
Sorry for the long-winded post. Please tell me your thoughts. I'm considering throwing on a NBS master cylinder but I'm >$300 in the hole as of right now and it's starting to feel like I'm missing something.
Thinking that maybe the MC went bad after being ran dry for so long (I ran it dry for about a week when the rear cylinder went bad), I took it out and replaced it with a BrakeBest (O'Reilly store brand) MC. I bench bled the MC per the instructions, but while I was bench bleeding it, I noticed a geyser of brake fluid coming up into the reservoir for the front brakes (the larger of the two reservoirs). Thinking this was normal, I put the MC on, bled the brake system, and had no pedal. A little while later, I took the new MC back to O'Reilly and exchanged it for another one, bench bled, put it on, bled the lines - still no pedal.
So I took it to Just Brakes and got them to bleed the system, thinking that maybe I was missing something. They did their thing, got my $114 (I got an oil change too), still had no pedal, had the nerve to tell me that it was "just supposed to be that way" (the motto of the incompetent), and I went home defeated again.
Later, I exchanged the MC again for yet another BrakeBest MC, same story.
The fourth MC I have gotten is the one you see in the video below. This is an ACDelco, part no. 174-723, as prescribed by the Chevy dealer after a VIN lookup (but I got this one on Amazon for <50% of the dealer's price hehe ty men).
Anyway, watch and be amazed:
https://www.youtube.com/watch?v=9ivN2PztDK8
Every one of the four (4) master cylinders I have bought have done this. The pedal goes entirely to the floor and I have very little stopping power (takes about 2.5 car lengths to stop for every 10 mph, more if going over 50). There are no apparent leaks anywhere else in the lines - I think I'd have noticed if there was one because I've been under the truck about 6 times bleeding the sumbitch. The steel brake lines are in great shape. I live in Texas so the roads are never salted.
Sorry for the long-winded post. Please tell me your thoughts. I'm considering throwing on a NBS master cylinder but I'm >$300 in the hole as of right now and it's starting to feel like I'm missing something.
