No fluid out of rear brake lines??? - Diesel Forum

ClassicFordGuy · 01-29-2006, 05:55 PM

I'm doing a brake job on my 94 F250, I have the rear pasenger cylinder off. I tried hitting the brakes to push some fluid out of the line to clean out some dirt but nothing comes out, no matter how hard I push the pedal. I am doing this with the truck off since it is on 4 jackstands, does this have something to do with the anti-lock brakes? Only the back are anti-lock right? The front calipers are applying just fine but nothing will come out the open line in the back.

thanks,

-Rob

Racer_X · 01-29-2006, 07:28 PM

My 95 always bleeds engine off. Only the rears are anti lock. The anti lock valve is on the frame rail just about below the booster. There is a bleed screw on it. You could try opening that and see if fluid is reaching that point.

cdnsarguy · 01-29-2006, 10:15 PM

Could be a bad flexible rubber hose too, theu can over time cause flapper valve effect sometimes allowing fluid in and not back or what your experiencing........also check for flattened lines. Remove the rear brake line from the M/C, pump it and see if fluid comes out.

Note...... Brake fluid is harmfull to the paint.

ClassicFordGuy · 01-30-2006, 12:46 PM

Thanks for the imput, I will look at it tonight. I didn't even think of a flatened line. I did check to see if the lines were even connected as the rear tires were burned off and I suspect the P/O was doing burnouts or something.

In the few times I did drive the truck around the block before it went in the backyard the ABS light was on, could the ABS Valve on the frame rail be locked up? I will check the bleed screw on the ABS valve, if fluid comes out there then I don't need to disconect the line at the master cylinder right?

Thanks,

-Rob

ClassicFordGuy · 01-31-2006, 12:50 PM

Well I worked my way up to the master cylinder and all looked well except that no fluid was in any of the lines. I unbolted the rear line fromt the master cylinder and was shocked by what I found. The P/O had screwed a machine screw into the line then bolted it up again. Guess that's one way to avoid replacing rear pads and clylinders.

I assume this could cause the ABS light to come on? Should it go off again once it has fluid and begins working or is there a way to reset it?

Thanks for all the help,

-Rob

cdnsarguy · 01-31-2006, 02:47 PM

Any info re the RABs valve ops should be in the info I sent you........

ClassicFordGuy · 01-31-2006, 07:48 PM

yes, it was full of diagnostic information that will be very helpfull now that the ABS modulator is actualy seeing some brake fluid.

Thanks for the info,

-Rob

Racer_X · 01-31-2006, 08:18 PM

[ QUOTE ]
Well I worked my way up to the master cylinder and all looked well except that no fluid was in any of the lines. I unbolted the rear line fromt the master cylinder and was shocked by what I found. The P/O had screwed a machine screw into the line then bolted it up again. Guess that's one way to avoid replacing rear pads and clylinders.

I assume this could cause the ABS light to come on? Should it go off again once it has fluid and begins working or is there a way to reset it?

Thanks for all the help,

-Rob

[/ QUOTE ]

Unbelieveable [img]/ubbthreads/images/graemlins/rolleyes.gif[/img] If you were in the rust belt, I'd suspect someone would have done that if the rear line rusted out between dual tanks where it's hard to reach. Looks like you have it now.