Replacement Chevrolet master cylinder

[Barry Churcher]

Hanno, I don't know the number right off hand but I probably have the box with the old core in it on a shelf someplace. Any of the cylinders above that the guys have mentioned should work. The cylinder with the new bracket was a fairly easy fab and it worked excellent. You have to make sure the bracket is heavy so as not to flex on application.
Cheers,
Barry

[Hanno Spoelstra]

Great input guys!

This info should give the next one looking for a master brake cylinder replacement enough info to work with. This is the sort of subject where the combined knowledge of MLU members keeps these ageing vehicles running.

Thanks,
Hanno

[Tony Smith]

This M/C is of the correct configuration:

https://www.ebay.com/itm/NOS-1936-19...EAAOSwHMJYFAgk

However, the seller recommends that the correct kit to put through is the #3 kit, which is only a 1" bore. This may be a typo, as the kit for the 1 1/4" bore is a #33 (also known as TM3630). If this is actually a 1" bore, I wonder if it could be bored out to 1 1/4" when sleeving?

[Grant Bowker]

Visually, the ebay master cylinder is consistent with the commonly found 1" size. I believe there was also a 1-1/8" cylinder made.
The NAPA kits 3 and 33 kits look similar in style, so without measurement I wouldn't assume the seller is wrong. The Raybestos kit for the 1" bore is MK3, consistent with the NAPA information in the ebay listing. The Raybestos kit for the 1-1/4" cylinder is MK33 so possibly the NAPA 33 might also be 1-1/4" but this is not confirmed.
I believe the casting number on the 1-1/4" cylinder (ebay listing gives 5450256) ends 61. On checking the 1-1/4" cylinder I have at home awaiting sleeving has 5450261 cast into it.
Personally, I would not be comfortable taking 1/8" all round off the wall of the cylinder without a lot of careful measuring and thinking. Even more so if removing a bit extra to allow for the sleeve.

[Guy Verstrepen]

mss is a look at this site www.chevsofthe40s.com/

[Harry Moon]

Don't use the new master cylinder #5454576E as it has insufficient volume and requires excessive travel and while i'm hesitant to say defective the hole in the side for the sensor lines up with the seals which then tears the seals.....

IMG_0090.jpg

[Guy Verstrepen]

https://www.generaaltjes.nl/Content/...6642-15715.jpg

turning - milling - boring work.
his name is fred Send metalwork.
info@fred-verschragen.nl
the man lives in the Netherlands