Re: 1951 200 Coupe Master Cylinder
Posted by HH56 On 2019/5/9 22:14:59
1.0100 is a special hollow bolt that fastens the brass block to the master and provides a passage for the fluid. The end that threads into the master is open and fluid comes out a couple of holes that will be positioned inside the center of the brass block. The copper washers provide the seal on either side of the block. Assuming you have the proper new master with the correct outlet hole and thread, the bolt should be able to be unscrewed and threaded into the new unit without difficulty or much disassembly. Try not to move the brass block too much so the tubing doesn't get stressed or loosened and you do need to be careful no dirt or debris gets in between the pieces which will affect the seal. The brakes will need to be bled before driving the car.
As to the construction of the bolt, on your 51 the brake switch is in the brass block and hex at the end of the bolt used to tighten everything into the threaded hole in the master is solid. On bolts used on some other models the hex end is open and threaded so the brake light switch can connect there.
Unknown if your new master came with any copper washers -- some do, most don't. It is a good idea to have new copper washers rather than try to reuse the older ones. Sometimes the older ones will seal if used again and other times the small grooves on the brass block will leave enough of a deformity in the washer surface that they will not seal properly. You can get new ones from Kanter for a nominal charge or sometimes but not always a local Napa or other parts store might have the correct sizes in stock. Hopefully they will because if they do not and need to order them from a distant warehouse the freight can be considerable. If that is needed getting them from Kanter is probably the better option.
Here is a photo of the bolt and some Napa local purchase washers that will work. They are just a tiny bit larger than the originals. It took a visit to several of my local Napa stores before finding the washers as none of the stores had both. The Napa computer doesn't seem to track stock between stores accurately because of the way the washers are sold. If you do try and buy local be prepared to visit the stores and maybe take the old washers so they can match them just in case the washers were mixed up as had happened at one of the stores I visited.
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As to the construction of the bolt, on your 51 the brake switch is in the brass block and hex at the end of the bolt used to tighten everything into the threaded hole in the master is solid. On bolts used on some other models the hex end is open and threaded so the brake light switch can connect there.
Unknown if your new master came with any copper washers -- some do, most don't. It is a good idea to have new copper washers rather than try to reuse the older ones. Sometimes the older ones will seal if used again and other times the small grooves on the brass block will leave enough of a deformity in the washer surface that they will not seal properly. You can get new ones from Kanter for a nominal charge or sometimes but not always a local Napa or other parts store might have the correct sizes in stock. Hopefully they will because if they do not and need to order them from a distant warehouse the freight can be considerable. If that is needed getting them from Kanter is probably the better option.
Here is a photo of the bolt and some Napa local purchase washers that will work. They are just a tiny bit larger than the originals. It took a visit to several of my local Napa stores before finding the washers as none of the stores had both. The Napa computer doesn't seem to track stock between stores accurately because of the way the washers are sold. If you do try and buy local be prepared to visit the stores and maybe take the old washers so they can match them just in case the washers were mixed up as had happened at one of the stores I visited.
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