Ghost Brake Fluid!?

[Docs]

1997 ext cab silverado 2wd 5.7.....Front half of master cylinder keeps going low..damn near dry!? Funny thing is, there are no leaks!? WTF....any help would be greatly appreciated!!!

 

[movietvet]

Ghost vehicle info?

 

[0xDEADBEEF]

I think the front half is for the drums. If so, probably a wasted wheel cylinder. Brake fluid can hide in there.

 

[GrimsterGMC]

One of the guys on here had it leaking out the back and filling the booster.

 

[movietvet]

Depends on how fast it leaks at the wheel cylinders. If pedal feels fine, then is seepage and the fluid can be absorbed by the brake dust. Could even be seeping at the line where it attaches at backing plate and mixing with dirt/crud there.

Is easy to check the leak where it attaches at booster. Unbolt the master cylinder and pull forward and look. No need to remove the brake lines for this inspection. Can look under dash at firewall and see if seeping there, too.

What am I missing? Why don't some members post there vehicle info? Is it a thing, or what. Post in the signature, so that info is always there.

 

[Docs]

1997 ext cab silverado 2wd 5.7

 

[Caman96]

Funny thing is, there are no leaks!?

It has to be leaking, you just haven’t found it yet. Disassembly required.

 

[HawkDsl]

Nothing on the ground usually is a dead ringer for behind the master. Hydro clutch will do the same thing, and usually is eating up your floor pan paint under the rug on the fire wall. Been there. Done that.

 

[Schurkey]

What am I missing? Why don't some members post there vehicle info? Is it a thing, or what. Post in the signature, so that info is always there.

Not my first choice. Some guys have multiple vehicles, so I don't know which of the vehicles in their signature they're talking about.

Others put a vehicle in their signature, then start a thread about their buddy's car, or their co-worker's truck...and again everything gets confused.

Putting the vehicle info in the title works...unless you're me and can't remember the title by the time the thread loads.

Put the vehicle info in the text of the first post, first thing.

 

[Road Trip]

1997 ext cab silverado 2wd 5.7

Greetings Docs, and Welcome to the GMT400 forum!

Instead of a 'one size fits all' brake system across all GMT400 models, there are
different brake options driven by how much weight they are going to have to deal
with. I've attached a chart I extracted from the '97 Factory Service Manual to
show you the differences. (See attached.)

If you could go to the inside of your glove box door and tell us which JBx or JDx
code is listed there and post that, then the brake gurus in here will *know* what
you are working with, can share their experience and tell you what to look for.

Cheers --