Mechanics

NISSAN TRUCK BRAKES PROBLEM

1986 Nissan Truck • 175,000 miles

My brakes will work fine on short distances but when I drive over a mile they get mushy and the pedal goes to the floor. I have replaced a leaking hose and then replace the front brake pads, did a bleed and still mushy. I replaced the master cylinder and bleed the whole system. They work for a short distance ( firm and strong) but when I drive over a mile the pedal goes to the floor. If I pump the brakes they work again but if I drive a bit they go mushy and to the floor again. Any help would be greatly appreciated!
Semper Fi
Phil.
Avatar
AZPhil
November 27, 2012.




Guys,
I could really use some help with this problem!
This is my ride to work and anything you could tell me would be great! So far I wasted close to $100 in parts I didn't need and I don't want to waste any more cash. If my donation was not enough let me Know!
Semper Fi
Phil


Tiny
AZPhil
Nov 29, 2012.
THIS IS HOW I DO IT---I DON'T NECESSARILY BENCH BLEED THE MASTER CYLINDER UNLESS IT'S BEING REPLACED OR HAS GONE DRY

NEVER SAW YOUR QUESTION UP FOR GRABS

http://www.2carpros.com/questions/1999-ford-f-150-brakes--3

THIS IS SIMPLE, EVEN SOMEONE ON "THE ISLAND" --DAY 2--COULD DO IT---PROBABLY REALLY FAST TOO!

LET ME KNOW HOW IT GOES

RANGERS LEAD THE WAY!

THE MEDIC


CJ MEDEVAC
Dec 3, 2012.
Check the load sensing valve for leakages.
AD


KHLow2008
Dec 3, 2012.
I took care of the problem. It was the Brake Booster that was bad.


Tiny
AZPhil
Dec 4, 2012.
Glad to know that you have fixed the problem but I have never encountered a booster producing such symptoms and logically it should be hard with braking efficiency dropping.


KHLow2008
Dec 5, 2012.

AD