OBS brakes

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Sep 22, 2010 | 10:40 AM

firemanp

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Joined: Jan 2005

Posts: 149

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From: Lake Sherwood, MO

OBS brakes

I have developed an issue.. I have about 2 good stomps of the brake pedal then the pedal gets hard like i have no brakes.. Give it a little bit and a normal pedal returns.. Im not losing fluid, i have checked all 4 corners and the master cylinder is full.. With a good pedal coming back Im leaning towards vacumn pump.. Any other ideas?

Sep 22, 2010 | 10:52 AM

RÖENTGEEP

FOREIGN GURU

Joined: Jul 2006

Posts: 7,655

Likes: 7

From: Celaya, Gto. MX

Quote:

Originally Posted by firemanp

My money is on the vaccum pump.

Sep 22, 2010 | 12:18 PM

pjwoolw

Postmaster

Joined: Nov 2005

Posts: 3,168

Likes: 10

From: San Ramon Ca.

In my case it was calipers. But the pump is a good bet too. Since its intermittent and if the heater controls are working normally (vacuum controlled) I'd look to the calipers.

Sep 22, 2010 | 04:59 PM

95 F-350 psd

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Joined: Mar 2008

Posts: 20

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i have the same problem right now!i just replaced the pads on the front,the pedal is really soft now and if i press down on the pedal a few times in a row then i gets hard and i have almost no brakes!------at first i thought calipers,but i replaced them about 7,000 miles ago,so now im thinking the master or vacuum!!!let me know what it ends up being!!!

Sep 22, 2010 | 07:15 PM

Mdt1992

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Joined: Oct 2009

Posts: 324

Likes: 1

From: VA BEACH

sounds like what mine was doing last winter, was able to switch vents and the vacuum pump was making vacuum, so i replaced master cylinder, wasn't it, replaced vacuum booster, nope same thing, then i was like screw it, threw a vacuum pumped at her and been great ever since, guess it is just not making enough fast enough where you have to wait for it to rebuild in the booster