Re: strange brake behavior

The part that gets me is the intermittent part.  However, if it is indeed 
the master cylinder it will eventually go all the way to the floor and
stay 
there.

I have had booster failures before and "usually" it makes the pedal get
real 
hard.

Earle

"John" <here@[EMAIL PROTECTED]
> wrote in message 
news:481f8591$0$31740$4c368faf@[EMAIL PROTECTED]
> nrs,
> if the Master Cylinder piston has bad seals, it will allow the brake
pedal 
> to go all the way to the floor and you wont have any loss of fluid.  The

> fluid still stays in the brake system, but it's not being applied to the

> calipers.
> I'm betting on a bad Master Cylinder.
>
> But I'm no Brake Wizard.  Take my advice with a grain of salt.  Have a 
> Brake expert check it out.
>
> "L.W.(ßill)Hughes III" <BillHughes@[EMAIL PROTECTED]
> wrote in message 
> news:a3423$481f786d$20174@[EMAIL PROTECTED]
>>    There:fore you know both cups failed at the same time.
>>        God Bless America, Bill O|||||||O
>>        mailto:BillHughes@[EMAIL PROTECTED]
>>  http://www.billhughes.com/jeep_bookmark.htm
>>
>> "nrs" <neale_rs@[EMAIL PROTECTED]
> wrote in message
>>
news:bc96cba3-0f17-4546-b483-1e0aa374fd10@[EMAIL PROTECTED]
>> On May 5, 12:50 pm, "Earle Horton" <earleh_nos...@[EMAIL PROTECTED]
> wrote:
>>> It's hard to believe, but the Jeep could have been at an angle extreme
>>> enough for the master cylinder to suck air. That's scary. The part
about
>>> the brakes being applied even though you had your foot off the pedal
is
>>> strange though. I would probably replace the master or at least tear
it
>>> down for inspection just in case.
>>>
>>> Earle
>>>
>>> "nrs" <neale...@[EMAIL PROTECTED]
> wrote in message
>>>
>>>
news:b4ab20cf-fc1f-407b-b12b-9583f5a054dd@[EMAIL PROTECTED]
>>>
>>>
>>>
>>> > While wheeling a few days ago, the jeep was at an extreme angle and
>>> > the engine was about to stall. I was driving off a ledge using the
>>> > brakes. I realeased the brakes to see if the Jeep would roll forward
>>> > a bit and then when I pressed on the brake pedal again it went to
the
>>> > floor with no resistance, I let it out and pressed again and it went
>>> > down most of the way but I think there was some resistance just
before
>>> > the floor. It seemed like the brakes where being kept applied
despite
>>> > my foot being off the pedal. I shut off the engine and restarted and
>>> > everything was fine for the rest of the trip and it was also fine
the
>>> > next day around town. There was no fluid loss, the reservoir is
still
>>> > full. Any ideas what could have caused this?
>>>
>>> > Thanks- Hide quoted text -
>>>
>>> - Show quoted text -
>>
>> What's really strange is that no fluid is missing and the brakes did
>> not require bleeding.  My best guess so far after looking at the FSM
>> is that the atmospheric pressure valve could be leaking.  This would
>> mean that even with the foot off the pedal there is still no vaccuum
>> at the backside of the diafragm, causing the brakes to stay applied by
>> the booster itself via the secondary pushrod.  The brake pedal could
>> come back up moving only the primary pushrod.  What would you
>> recommend, change the booster or the entire master cylinder and
>> booster assembly? I'm leaning towards replacing the booster only for
>> now.
>>
>>
>> ** Posted from http://www.teranews.com
**
>