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74 chvypiu1/2 ton 2 w/d cant get fluid to back brakes


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smilz
New User

May 14, 2011, 4:24 AM

Post #1 of 4 (1420 views)
74 chvypiu1/2 ton 2 w/d cant get fluid to back brakes Sign In

 { started out front, right calliper was stuck in the “ out” position== replaced both calliper assemblies up front...replaced shoes in back and wheel cylinders... replaced master cylinder (bench bled). Discovered front right brake line was clogged between fender and calliper (replaced). UNHOOKED all other lines at wheels and blew them out...replaced proportioning valve......The front brakes seem to be working fine up front,, but still no pressure to the rear.


Tom Greenleaf
Ultimate Carjunky / Moderator
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May 14, 2011, 4:55 AM

Post #2 of 4 (1411 views)
Re: 74 chvypiu1/2 ton 2 w/d cant get fluid to back brakes Sign In

It's happened to me with things replaced properly that rear brakes cyl just don't want to bleed. Keep master full. Try with a helper pressing brake and see if it will push out right at master just a tad opening line.

I've had luck applying vacuum with a vacuum pump into a clear line (long) till is sucks some fluid to the furthest wheel cylinder. Stop and don't let brake fluid into the ever handy hand held vacuum pump and then it should bleed out on both side.

This vintage wasn't that hard but still can be fussy. May just be that bench bleeding didn't work or you lost it between bench and getting lines hooked up.

FYI the smaller of two reservoirs (front) is for the rear brakes.

More: You could try on vehicle "bench bleeding just rear? That or they have a pressure bleeder that maybe you could rent - dunno on that,

T



re-tired
Veteran / Moderator
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May 14, 2011, 7:55 AM

Post #3 of 4 (1399 views)
Re: 74 chvypiu1/2 ton 2 w/d cant get fluid to back brakes Sign In

 Be sure your calipers are on correctly .The bleeder port should be above the inlet line . If wrong you will have an airpocket that will affect bleeding. If fronts are ok , undo the rubber line at the rear axle and see if fluid comes out...


LIFE'S SHORT GO FISH


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 14, 2011, 8:38 AM

Post #4 of 4 (1398 views)
Re: 74 chvypiu1/2 ton 2 w/d cant get fluid to back brakes Sign In

Good idea RT as usual. I know we've both been at this stuff since Grant took Richmond - smile. IDK why, but some of these just "gravity" bleed right away and some give a fight to get started. I'm real careful and fast from bench bleeding to attaching lines making sure the flare nuts are free as a bird so can be fast and lose the bench bleed job. Even when they do battle I still get it eventually.

Just thought of one more thing I've run across especially on an older vehicle like this. sometimes you need to take the bleeders completely out and verify the bigger hole and the small one down by where it needs to be clear is clear. Can use drill bits by hand usually if clogged or just get new ones. Should be able to blow shop air right thru them.

Good luck poster - you'll get it,

T







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