Replaced master cylinder bled lines , no change still soft pedal when engine is running, hard pedal when engine is off, replaced vacum booster still no change
If your rubber brake lines are from the factory those hoses can stretch when the brakes are applied. This same thing happened to me. I replaced the master cylinder, with little to no change. So then I changed the brake booster. And if you read the fine print if either the brake booster or the master cylinder go bad it can take the other with it. So if the rubber brake lines don't fix this I would look at replacing both the master cylinder and the brake booster at the same time. But if you would like to trouble shoot this issue a bit more you can clamp off just the rear brakes or just the front brakes or even clamp off 3 of 4 or if it might be a issue before it even hits the brakes them self you can clamp off all 4 of the brakes to see were the problem is. This is to test fewer components at once and to see if the issue is with the cylinders / calipers or hoses. This will help you determine the location of the problem faster and with out throwing parts at your truck and hopping it fixes the issue.
Pull your rear drums and inspect the shoes,you may have too addjust them out by hand too get the peddle you want
you need the engine running when you beeld the brakes,and its easiser too do with two people,if your doing it by your self your need a hand vaccume pump
also you may have a bad calipiar not coming out all the way that will cause a soft pedal
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That is not the problem adjusting the rear shoes, let me start over and tell ya everything. 1998 chevy 1500 4x4. I was traveling home from a trip when i noticed the brake pedal went soft nearly goin all the way to the floor, 1st thought was the master cylinder was goin out, replaced master cylinder, and bled brakes w/o engine running, the pedal would get hard at top. as soon as you crank the vehicle pedal would go soft and nearly to the floor, 2nd thought was the vacuumn booster, replaced booster, no change.exchanged the master cylinder again bled brakes with engine running and still had soft pedal. drove truck down the road and still had soft pedal, bled brakes again, pulled rear wheels off and checked rear hubs they are not loose on pads. still have a soft pedal and nearly goes to the floor when applied. also changed out abs control from another vehicle that was stopping properly with hard pedal and it only recedes about a 1/4. any suggestions please help im at wits end
checked both front calipers no problem,if one of the calipers were goin out it would probaly pull to one side or the other.If you read all of the previous post i stated i bled it with engine running.... I have someone helping and not trying it by myself.
I have the same problem with Accent 1.6 GL. Please help.
3 new master cylinder.new fluid. bled brakes. solid fluid comming out of all four bleeders
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