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My brakes will work fine on short distances but.

Tiny
AZPHIL
  • MEMBER
  • 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.
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Tuesday, November 27th, 2012 AT 10:37 PM

5 Replies

Tiny
AZPHIL
  • MEMBER
  • 3 POSTS
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
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Thursday, November 29th, 2012 AT 5:08 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
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

https://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
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Monday, December 3rd, 2012 AT 3:53 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Check the load sensing valve for leakages.
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Monday, December 3rd, 2012 AT 8:50 PM
Tiny
AZPHIL
  • MEMBER
  • 3 POSTS
I took care of the problem. It was the Brake Booster that was bad.
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Tuesday, December 4th, 2012 AT 5:34 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
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.
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Wednesday, December 5th, 2012 AT 1:45 PM

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