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I have a 93 4.6. I need to replace the master brake booster. I can see that it’s labeled ST, but, when I look for replacement parts there seems to be brake code number that they want to know. I assume that it’s the number for the master cylinder but I don’t know where to find that number. For example, rockauto shows the parts as:

Brake Code JM3; with Booster Stamped ST

Brake Code JM5; with Booster Stamped ST

Any idea where to find that number? Is it somewhere on the master cylinder or somewhere else?
 

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B4U Task Force Admin
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Look on the end of the m/c....sometimes the numbers are etched there.
 
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