[DeTomaso] Brake Master Cylinder Issue

Ken Green kenn_green at yahoo.com
Wed Mar 4 16:31:47 EST 2020


 Maybe measure the ID of the cylinder or OD of the piston, and find an O-ring?

    On Wednesday, March 4, 2020, 1:17:47 PM PST, Mike Drew via DeTomaso <detomaso at server.detomasolist.com> wrote:  
 
 It's from Precision Proformance (Bobby Byars RIP). It's a Chevy master and red rolled stock booster assembly. He also offered a slightly smaller aftermarket booster. 

In any case, the master is generic Chevy. I think it's a step-bore design, where the front and rear circuits use a different piston/bore diameter?

Mike

Sent from my iPhone

> On Mar 4, 2020, at 10:27, Sean Korb <spkorb at gmail.com> wrote:
> 
> I'm not sure but I think that is a Pantera Performance part, which is
> a redrilled booster and master from a full size Chevrolet van.  You
> might be able to grab the casting number off the master and get a
> replacement from AutoZone or RockAuto or NAPA.
> 
>> On 3/4/20, Bill Cartus via DeTomaso <detomaso at server.detomasolist.com> wrote:
>>  My brake master cylinder was leaking so I took it off. I can easily see
>>  that the problem is the larger rubber 'o-ring' has a small crimp in it
>>  (not sure how it was even working unless the rear portion was doing
>>  most of the work), but it appears no one sells a repair kit (per
>>  Wilkinson rep I talked with). I can't see spending $289 for a whole new
>>  master cylinder when a $1 part will take car of it.  Does anyone know
>>  where I can get these parts? Has anyone used an after market unit from
>>  Summit Racing (as an example) replacing the tandem unit attached to the
>>  booster?  I have a 1972 car and assume it has an Italian factory
>>  replacement unit from around 2016. Attaching a small pic below.  All
>>  advice appreciated.
>>  Thanks,
>>  Bill Cartus #3633.
> 
> 
> -- 
> Sean Korb spkorb at gmail.com http://spkorb.org (est 1994)
> "Computers are useless.  They can only give you answers." -P. Picasso
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-------------- next part --------------
   Maybe measure the ID of the cylinder or OD of the piston, and find an
   O-ring?

   On Wednesday, March 4, 2020, 1:17:47 PM PST, Mike Drew via DeTomaso
   <detomaso at server.detomasolist.com> wrote:
   It's from Precision Proformance (Bobby Byars RIP). It's a Chevy master
   and red rolled stock booster assembly. He also offered a slightly
   smaller aftermarket booster.
   In any case, the master is generic Chevy. I think it's a step-bore
   design, where the front and rear circuits use a different piston/bore
   diameter?
   Mike
   Sent from my iPhone
   > On Mar 4, 2020, at 10:27, Sean Korb <[1]spkorb at gmail.com> wrote:
   >
   > I'm not sure but I think that is a Pantera Performance part, which is
   > a redrilled booster and master from a full size Chevrolet van.  You
   > might be able to grab the casting number off the master and get a
   > replacement from AutoZone or RockAuto or NAPA.
   >
   >> On 3/4/20, Bill Cartus via DeTomaso
   <[2]detomaso at server.detomasolist.com> wrote:
   >>  My brake master cylinder was leaking so I took it off. I can easily
   see
   >>  that the problem is the larger rubber 'o-ring' has a small crimp in
   it
   >>  (not sure how it was even working unless the rear portion was doing
   >>  most of the work), but it appears no one sells a repair kit (per
   >>  Wilkinson rep I talked with). I can't see spending $289 for a whole
   new
   >>  master cylinder when a $1 part will take car of it.  Does anyone
   know
   >>  where I can get these parts? Has anyone used an after market unit
   from
   >>  Summit Racing (as an example) replacing the tandem unit attached to
   the
   >>  booster?  I have a 1972 car and assume it has an Italian factory
   >>  replacement unit from around 2016. Attaching a small pic below.
   All
   >>  advice appreciated.
   >>  Thanks,
   >>  Bill Cartus #3633.
   >
   >
   > --
   > Sean Korb [3]spkorb at gmail.com [4]http://spkorb.org (est 1994)
   > "Computers are useless.  They can only give you answers." -P. Picasso
   > _______________________________________________
   >
   >
   > Detomaso Email List is not managed by POCA
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   >
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   use the links above.
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   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.
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References

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