no brakes!

wrangler00

wrangler00

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Jun 16, 2009
Location
morganton
I got a 94 isuzu trooper and the other day I was driving and all of a sudden the brakes went to the floor I stopped and checked he fluid and it was out so I put some in and its still doing it do you think I just need to bleed the brakes ir could it be something else?
 
your diagnosis screams bad master cylinder to me...
 
You're gonna have to bleed the entire system. Starting with the master cylinder.

Edit: and find out why there was none in there, like Ron said.
 
wrangler00 said:
I got a 94 isuzu trooper and the other day I was driving and all of a sudden the brakes went to the floor I stopped and checked he fluid and it was out so I put some in and its still doing it do you think I just need to bleed the brakes ir could it be something else?
Click to expand...


You need to find and fix the leak for starters. Then you can bleed them and should good
 
there are copper washers between the brake hose and caliper might be leaking there sit in the drive way with clean cardboard under it and pump them for a while and see if it drips
 
a brake system should never use fluid.
The entire theory of the hydraulic syystem is that it is a totally sealeed set up and when you press the brakes a piston pushes in the fluid, since the fluid has neo where to go, and the lines are hard and cant expand they by definition push the calipers/wheel cylinders against the rotors/drums and the friction slows the vehicle down.

If there is any leak, it will show itself quickly. As any escape route is certainly easier than stopping a 3500lb vehicle at x velocity.

hat said I mis posted in my first response, I meant to say wheel cylinder, but I dont even know what type of brakes you have,, disc/drum, 4 disc, 4 drum etc.

Park it on a hard surface, fill the master cylinder and pump the brakes for a minute or so. I am betting you will have lost some fluid. If it isnt obvious where it came from, refill and have a friend pump while you look under it.

Under no condition would I go driving it until the problem is found and repaired. When brakes go they dont tend to ease out, they go all at once and you are left "controlling" a very heavy, very fast, very hard bullet with no way to stop it besides hitting a tree, LOL...
 
Wheel cylinder would be my first guess... but there's always rusty lines, leaking rubber hoses, and broken fittings too.

Only way to find out is fill it back up and look for leaks.
 
Ron,

I helped him bleed them today, Looks like someone has been trouble shooting this issue before he got the trooper. I tryed bleeding the rear first and there is no fluid making it to the rear (discs) seems there is a blockage to the rear brakes, Bleed the front and a soapy looking fluid came out, Not sure if someone has put a cleaner in it hoping to unclogged the rear lines. Not sure if its in the prop valves or in the lines, there are no leaks that I can see. It looks like the MC has been replaced recently (Its allot shiner than the rest of the parts). Could be in the ABS system. The front brakes are working great, The Rear Calibers aren't moving at all, Even with the bleeder pulled in the rear hardly any fluid comes out when the brakes are pressed.

Info on the Trooper

94 Trooper 4x4 with 4 wheel Disc brakes, He just picked it up a few weeks ago.
 
Pump the pedal several times then loosen the brake line for rears at the master cylinder. This will tell you if you are getting pressure to the rear or not from the MC. MC may need to be bench bled since there was no fluid in it.
 
Is there a junction box/splice on the rear axle that sends fluid to either side?
if so crack it there see if you can get fluid out.
If not then go back to mc crack line there going to rear if fluid there disconnect and blow air through line probable clog between there and rear axle. if not mc issue.
 
How do the hard lines to the rear look in general? I mean like there condition. I know i had a similar problem with a cherokee because there was something wrong with the proportioning block on the axle that split the one line from the m/c to each disk. I didnt figure it out untill i pump the brakes with the block not connected.
 
oh and ive also been told that some abs units must have the fuse pulled before you can bleed them properly..doing with out so could cause an error in the abs....but that was just something i was told at one time
 
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