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Hello All -
My 48 Car has a Master Cylinder # 5450655 by Delco.
My Master Parts Catalogue does not list this # but does list a # 5453737 and in using this unit, also requires the following #'s in conjunction - when installed on 1940-1948 Pass - Gaskets 799303, 799390, and connector 5453738.
Both the FS and Chevs of the 40's have the 5453737 but do not have the gaskets and connectors to install this m/c on my 48.
Can anyone confirm my idea that the only difference in my orig m/c and the 5453737 is the rear outlet nut that the single brake line attaches to?? I really don't want to change my brake line to fit the 5453737 m/c if that is the only difference. I have already tried to interchange the rear outlet nut from the orig 48 one to the 5453737 and they will not interchange due to differences in the chamfer on the orig m/c outlet and the lack of chamfer on the outlet of the 5453737.
Any thoughts on this?? Thanks
Jim.
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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The "737" master cylinder is a 1949-1952 unit.
In about 1950 the original style 1940-1948 M/cyl was discontinued and replaced by the later unit. The line hook-up was changed so the new style fittings,etc. were required.
Gene Schneider
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ChatMaster - 750
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ChatMaster - 750
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Thanks Gene. Looks like will have to have my m/c resleeved.
Jim.
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Joined: May 2011
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Oil Can Mechanic
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Oil Can Mechanic
Joined: May 2011
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Thanks Gene. Looks like will have to have my m/c resleeved. Jim. Are rebuild kits still available? It seems like I rebult mine back in about 1965; honed it and cleaned out the ports and put in new rubber parts. They have sleeves available if they are too far gone?
Richard
Waverly, IA
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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For added safety, you are strongly urged to have your master cylinder and all slave cylinders lined either with SS or brass. All you need then is to purchase the rubber parts and they are sold by the size. Use your old hardware.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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ChatMaster - 6,000
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ChatMaster - 6,000
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Ray, How does having your cylinders lined with SS or Brass increase safety? Charlie 
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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Just take a master cylinder or wheel cylinder apart and observe the crud that is in there. Clean the bore and take a look at all the rust pits. Not something I would want to drive. I have converted several cars to sleeved brake cylinders, to include mine, and have never had a brake failure.
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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ChatMaster - 6,000
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Well, I have never had mine converted to brass or SS and I have never had a failure either. Nor have I had either one blow out. If you hone a MC or WC out and put a new kit into it, it will not leak and it will not fail any sooner than a sleeved one. In fact it is just as good as the resleeved ones. Maybe even better owing to the castings ability to absorb and retain a tiny bit of fluid in the microscopic pits in its walls. I'll concede that if a MC or WC is SEVERELY compromised by corrosion or crude (whatever), it can be saved by having it sleeved instead of junking it. Short of this severe condition, and a few little minor visible spots in the casting don't justify it, you can rebuild it and it will be safe. No failure. The automobile industry has been rebuilding MCs and WCs with safe results for many decades. Personally, I think the idea of resleeving a MC or a WC short of it being junk, is just more smoke and mirrors and snake oil. It is costly and, in most cases unnecessary and give a false impression that you are safer. For instance, if you apply the brakes, then the pressure in the brake lines on to the rubber that meets the road doesn't know the difference between a sleeved cylinder and an unsleeved one, or care. Just my two cents worth, Charlie
Last edited by 41specialdeluxe; 05/12/11 03:28 PM.
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ChatMaster - 1,000
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ChatMaster - 1,000
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I agree with one exception. The corvettes with 16 wheel cyl.
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ChatMaster - 750
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Hey Charlie,
Not necessarily junk or smoke having them sleeved. The one thing you failed to mention is that after honing them out, you still must meet specs on the piston to bore sizes, and if you are past specs, then one must do something else. Correct??
In my case, am having so many problems with braking system, am now to point of almost hysteria. Have to try this boring and sleeving next. Over the past 50 or so years, have never run into the problems I am now facing.
Best to ya, and am still gonna take a picture of my 48 with the SKIRTS and VISOR on her, just to iritate ya a bit.
Jim.
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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41specialdeluxe, Can I mark upon the wall that your are not into sleeving?
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Mar 2009
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ChatMaster - 750
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Got my m/c back from FS after boring and sleeving. What a great job!!
It's an earlier unit, #6460461 or 0451 with brake light switch opening in housing. Now, can I use a standard 5/16 x 24 bolt to plug that hole, or will I need to use the standard brake light switch to plug the hole as this m/c is going into my 48??
Thanks in advance.
Jim.
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