1995 Chev.2500 7.4L 4WD - No back brakes!

[tommytrees]

My 95' Chev. truck has no back brakes. I took it to my mechanic, and he said he thought it was the ABS box. He put a new one in and bled the lines. Still no pressure and no back brakes. Now he thinks it is the electronics on the ABS box. Has anyone had this same problem??? Do you have any solutions. Let me know. Thanks.

Tom

[777stickman]

Originally Posted by tommytrees

My 95' Chev. truck has no back brakes. I took it to my mechanic, and he said he thought it was the ABS box. He put a new one in and bled the lines. Still no pressure and no back brakes. Now he thinks it is the electronics on the ABS box. Has anyone had this same problem??? Do you have any solutions. Let me know. Thanks.

Tom

Never had that problem, but I would be looking at the master cylinder as the front and back brakes are seperate in it. Let us know.

[TEXAS-HOTROD]

There was an older Chevy that I was servicing the brakes on and I couldn't get pressure to the rear. I remember some kind of valve/connector that was tied into the rear brake line. I think it was located near the firewall by the master cyl. It was a long time ago so it's hard to remember.
Some 3/4 ton Chevys had a brake pressure control valve that was operated by a linkage that connected to the rear axle.
Is the brake pedal hard or spongey?
Follow the lines from front to back and see what all it goes to. I have an assortment of brass fittings I use for diagnosis. I have bypassed ABS units and brake valves to find some strange problems.
It's cheaper to locate and fix the problem than to just throw parts at it.
Post back on how taht pedal feels.

[kevtech1]

Originally Posted by tommytrees

My 95' Chev. truck has no back brakes. I took it to my mechanic, and he said he thought it was the ABS box. He put a new one in and bled the lines. Still no pressure and no back brakes. Now he thinks it is the electronics on the ABS box. Has anyone had this same problem??? Do you have any solutions. Let me know. Thanks.

Tom

What happened before you had no rear brakes? I just had to replace my entire brake line to the rear due to a rust blow-out. I assume there are no leaks to be seen on yours--otherwise you'd have your answer. Bleed the poop out of them, make sure they are adjusted properly. I do not think that the ABS modulator (box) has much to do with fluid pressure to rear during normal braking. One would also have to believe that the ABS light would be on if there were a problem with ABS system.