86 4RunnerBrakes sticking please help

I have a 4runner and when i leave i have a good soft pedal and when i drive it a few mins my pedal will keep coming to the top and once it has made it to the top it gets real hard and my brakes drag my engine down so bad i have to stop and bleed them off at the master cylinder...So heres what i have replaced Master cylinder front brake calipers and pad Can some one please help me ive ran out of money to replace things please help

Do your rear brakes look ok?Could be a defective brake hose with a deteriorated lining that acts as a one-way valve and won't let brake fluid return to the master cylinder, the hose liner swells up and acts as a restriction to fluid flow, The pressure developed by your foot and the booster can overcome this resistance but the return springs (rear) or the elasticity of the caliper seals(front) cannot so once you have used your brakes a bit the pressure is so much it holds you brakes on cuz the fluid isn't returning to you master. If its an 86 and the lines are fairly old that is your best bet. hope i helped

I have also heard of the booster push rod being out of adjustment even though i dont know if it would cuase the problem your having, just ideas I still think the hose is your best bet though

I have also heard of the booster push rod being out of adjustment even though i dont know if it would cuase the problem your having, just ideas I still think the hose is your best bet though

Thanks for the information i just got back home from Advance auto parts with new lines...I hope this fixes it..I will let you know how it goes

Well Its 12:47 PM and i got my lines on and i took it for a test run the pedal just keeps coming up to the top then when it gets there the brakes start dragging Has anyone had this problem please help me it my only way to work and this problem is costing me dearly Thanks Rick,

I dont understand, my sisters 4runner had that problem, her one brake was smoking it was so hot and i replaced the line and it was fine. Can you tell if its the front brakes or the rear?

I dont understand, my sisters 4runner had that problem, her one brake was smoking it was so hot and i replaced the line and it was fine. Can you tell if its the front brakes or the rear?

Hey glad your online Ive got some great news and The rod in the master cylinder was out to far thanks you sooooo much for helping me you were such a great help....I have my prob fixed now after about 300$$ i didnt have lol and all i needed was to adjust that...Again thanks alot

Glad i could help, sounds like you have a brand new braking system haha. The positive side is that you wont have any problems with it for a long time. I still have nightmares about driving and having no brakes