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I have new, the below pictured master cylinder. When I bench bled it, I had to back the center bolt way out to get full travel of the piston. Now that I have it on the car, I cannot get full pedal travel to the floor, and very little fluid movement If I remove the bolt of course it leaks there. What is the center port for? The bolt in there has a stem on it like it is designed to block the piston from traveling. Why? 

Also, my pedal returns very very slowly after depression. Not normal. 



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Last edited by George P
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Hello RRS1,

It is not a center port, it is a machining for the bolt that holds the secondary piston.

The bolt stem glide in the machining of the secondary piston.

If you have removed the bolt, without precaution, you have surely blocked the secondary piston, it is necessary to disassemble the master cylinder and reassembling being careful to put the bolt stem in the machining of the secondary piston

Below the internal parts of a brake master cylinder:





hello RRS1,

you must keep the stemmed bolt as it limits the displacement rearward of the secondary piston, when reassembling you must place the secondary piston after the bolt (see picture below).
If you want to replace your brake master cylinder by a copy of the original there is which sold ones for ferrari 308 right hand drive (same as pantera) ref superformance : Master cylinder RHD 308 30806095 (539.90 $).





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I paid mine 269.95 £ at (about 6 months ago) but I saw it on the site ferraripartsexchange at 539.90 $ ……..

It's very difficult to say, but, from what I see in the photo of the superformance site, I do not think that the kit 30806105 "Complete Master Cylinder Rubber Kit" can be mounted on the OEM pantera brake master cylinder, someone would have to try.

The kit OEM Pantera kit resembles at an Alfa gt kit (see attached link) for information the 2 master cylinders are of the brand: benditalia.
The problem: it is the internal diameter which is 22.2 mm on the Alfa GT whereas it is 23 mm on the Pantera, the kit in 23 mm is according to a French brake specialist  (ets ETIENT) cannot be found.



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I have an aluminum master that I could not trace beyond the manufacturer. Order a Chinese replacement and in came a cast iron one. The internal seals matched so I swapped those and it works great. I kept the original seals in case but flip, everything is made in China these days.

The TR6 guys used to get pissed when I told them they had Chinese TR6's because all the replacement parts came from China and were total junk. It was so bad I gave up on it.

Don't tell me the Chinese are making Ferrari parts.

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