[Spridgets] MC Push Rods

[Gerard]

All the info regarding disc brake upgrade and differences between  
master cylinders is here:

http://gerardsgarage.com/Garage/Tech/DbrakeUg.htm

Gerard

On Jul 19, 2011, at 11:00 AM, spridgets-request at autox.team.net wrote:

> Message: 5
> Date: Tue, 19 Jul 2011 09:05:01 -0500
> From: "Bert Shirey" <bertshirey at zoominternet.net>
> To: <spridgets at autox.team.net>
> Subject: [Spridgets] MC Push Rods
> Message-ID: <58A416897DFC4DF4BCF6B08A0B526EBC at yourw92p4bhlzg>
> Content-Type: text/plain; charset="us-ascii"
>
> Guys and Gals,
>
>    The Master cylinder push rod mix-up business caused my buddy and  
> me a lot
> of grief when doing his MGA a while ago.
>
>      The 3/4" and 7/8" MCs do not use the same length rods. Rods for  
> the 3/4"
> is shorter than the 7/8" and they are not interchangeable And  
> because the MCs
> outwardly look the same, it`s easy to mix-up the rods. Also, since  
> the 7/8" MC
> used on the drum brake systems is still available new and will work  
> on the
> disc brake cars, supposedly correct replacement rods you order for  
> the 3/4"
> may be incorrect.
>
>       You can adjust the effective length of the rod but not enough.
>
>       Too long rods will overthrow the bores and at least make a  
> mess while
> preventing bleeding. More likely they will wreck the rebuild. Too  
> short, and
> the pistons will not travel enough to bleed.
>
>      In the case of the A, we sent the original 7/8" MC off for a  
> rebuild. We
> were unaware that a 3/4" was returned in error. The longer rods  
> ruined our day
> right up to the start of Happy Hour, when the whole screw up didn`t  
> seem so
> bad after all.
>
> Bert Shirey
> 66 Midget 1098/60 Bugeye