[Mgs] [EXT] bleed screws

[John DiFede]

If the wheel cylinder was replaced there’s no telling what you might have.  On my mgb at one point the rear cylinders each had a different size bleed screw.  I needed a different wrench for each one.  

Your threads could be metric if the cylinder was replaced and the replacement was manufactured in the Far East. 

Sent from my iPhone

> On Jan 29, 2021, at 2:22 PM, dave at ranteer.com wrote:
> 
> 
> I have pretty thoroughly searched Barney's site.  someone please correct me, but i have found no discussion on threads on bleed screws on MGAs.  
> 
> the following is from Cecelia at Scarborough Faire.  Leads me to believe that mine have been mucked with to some extent (no surprise there)
> 
> 
> On the MGA wheel cylinders ONLY the early REAR wheel cyls had the 20 tpi BSF Whitworth bleeder screws which we also offer in our catalog on the same page (M71E), but be aware that the bleeder screws go into that solid brass banjo M96E Adaptor NOT into the wheel cylinder itself. What goes into the wheel cylinder is our part M97 Banjo bolt which is also 3/8-20tpi BSF Whitworth.
> 
> On the front wheel cylinders the M71 Bleeder screws are 3/8-24 tpi, NOT Whitworth.
> 
>> Paul Osborne
>> Department of Electrical and Computer Eng
>> University of Rochester 
>> 201 Hopeman Building RC
>> Rochester NY 14627
>    585-275-5226 
> 
> 
> 
> 
> 
> 
> 
> 
>> On Jan 29, 2021, at 12:55 PM, Max Heim <mvheim at sonic.net> wrote:
>> 
>> I am pretty sure there would be no factory metric parts on the MGA. But there is information about this online. Barney Gaylord’s site probably has what you need.
>> 
>> --
>> Max Heim
>> '66 MGB
>> 
>>> On Jan 29, 2021, at 9:12 AM, dave <dave at ranteer.com> wrote:
>>> 
>>> I have a 56 mga, and the wrench that fits the bleed screws for the brake cylinders (drums all around) are whitworth.  And the thread doesn’t match either metric or SAE on my thread checker so I am assuming that is also metric.
>>>  
>>> Not knowing the true history or this car I am assuming that it came that way.  But I also realize that maybe someone grabbed the brake cylinders off a TD or even a TC and used those.
>>>  
>>> Is there any corroborating evidence out there one way or the other?
>>>  
>>> It seems original in many ways; has a lot of the weird stuff the early cars came with if that is any help.
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