Re: Brakes need pumped to work, why?

[Jim Altemose <jaltemoose@xxxxxxxxx>]

Are you disc and drum?  Did you convert from drum / drum?  Did you add
or do you have a proportioning valve?

- Jim
Jim Altemose, Long Island, NY
'63 Polara 500 (Max Wedge)
'63 Polara 500 (383)
'65 Belvedere I (Street Wedge)
'71 Bronco

On Wed, Feb 1, 2012 at 11:43 PM, Eric R <hoodoovoodooray@xxxxxxxxx> wrote:
> Thanks Daniel.  I'll try the other stuff first, then look into the
> bore size. Yes, it's a disc/drum m/c.
>
> This m/c was supposedly  "new" from Rock Auto.  But, it also was a
> closeout at $30.
>
> I think there's good ideas here. Thanks!
>
>
>
> On Feb 1, 11:38 pm, "Daniel McCormack" <mcwhe...@xxxxxxxxxxxxxx>
> wrote:
>> Eric the Dart MC you used is for front disc rear drum brakes correct? The
>> rear chamber is larger than the front and the rear chamber goes to the front
>> brakes right? Assuming all that is correct do you know what size bore that
>> Dart MC has? Years ago I converted a 56 Ford F-100 to a torsion bar front
>> suspension from a Chrysler Cordoba. (yes there's a kit out there to do that)
>> I used the disc brakes from the Cordoba and a Dart MC and ran into the exact
>> problem you're describing. Turns out the bore of the MC was too small for
>> the Cordoba calipers. Switched to a larger bore MC and the problem was
>> solved. The other possibility is that the MC is defective. Was it brand new
>> or a rebuilt? I've never had any luck with a rebuilt MC.
>>
>>
>>
>> -----Original Message-----
>> From: 1962to1965mopars@xxxxxxxxxxxxxxxx
>>
>> [mailto:1962to1965mopars@xxxxxxxxxxxxxxxx] On Behalf Of Eric R
>> Sent: Wednesday, February 01, 2012 7:13 PM
>> To: The 1962 to 1965 Mopar Mail List Clubhouse
>> Subject: Brakes need pumped to work, why?
>>
>> I converted to AAJ discs. Used a 1976 Dart  dual master cylinder. No
>> leaks anywhere.
>>
>> I bench bled the master cylinder best I could.
>>
>> I bled the brakes using a hose and check valve into a jar of brake
>> fliud. This works on all my other vehicles.  I ran quite a bit of
>> fluid through to make sure.
>>
>> Brake pedal goes straight to floor but will pump up quickly and hold
>> pressure.  As soon as I let up and pedal comes all the way to the TOP
>> the brakes are gone again and need to be pumped.  If I just let up a
>> little I don't lose them.
>>
>> I then gravity bled them all for a few hours..  Two rears at same
>> time , then two front at same time.
>>
>> Still get the same result.
>>
>> I thought I read something about the Dart M/C  losing pressure
>> somehow?  Or, is it air in m/c?  Bad m/c?
>>
>> Any advice is great ...  I would loooove to drive this car oneday.
>
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