Brake master cylinder pushrod

jingleycatjaguar · Post by **jingleycatjaguar** » Mon Nov 10, 2014 9:58 pm

Is there anyone out there that could measure their brake master cylinder pushrod please?
Part number C26529.
Its for a series 1 4.2, 2+2. It should be the same on a series 2.
The early ones had a different part number ( C25901).
Mine is 85mm from the clevis pin hole to the end.
The reason I ask is that I have excessive travel on my brake pedal before anything happens. Everything is brand new and properly bled. It has occured to me that if my pushrod is too short that may be the cause of the problem.

Thanks
Steve

38E · Post by **38E** » Thu Nov 13, 2014 11:15 pm

I have a spare pedal box here (with the earlier part number) and the pushrod measures 5-1/2" (139mm) from the centre of the pivot to the end.

(Not from my 3.8, it's from a 4.2, about 1964)

jingleycatjaguar · Post by **jingleycatjaguar** » Fri Nov 14, 2014 9:09 am

Thanks for the reply. It seems that I have the correct one. THe problem with the excessive travel looks like a sticking piston in the NEW master cylinder. Its being rebuilt today so hopefully I can re assemble it tomorrow.
Steve

abowie · Post by **abowie** » Sat Nov 15, 2014 12:45 am

If once you have reinstalled it you have the same problem, try pressure bleeding the MC.

PeterCrespin · Post by **PeterCrespin** » Sat Nov 15, 2014 10:45 pm

jingleycatjaguar wrote:Thanks for the reply. It seems that I have the correct one. THe problem with the excessive travel looks like a sticking piston in the NEW master cylinder. Its being rebuilt today so hopefully I can re assemble it tomorrow.
Steve

Be sure to adjust the threaded pedal stop to prevent the pedal coming up too high.

jingleycatjaguar · Post by **jingleycatjaguar** » Sat Nov 15, 2014 11:26 pm

That begs another question,. What is the correct adjustment for the pedal?
Steve

PeterCrespin · Post by **PeterCrespin** » Sun Nov 16, 2014 12:45 am

Whatever you like so long as the piston returns far enough to replenish the circuit from the M/C reservoir.

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