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diff --git a/764/CH12/EX12.13.b/result12_13.txt b/764/CH12/EX12.13.b/result12_13.txt
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+-->//(Brakes) Example 12.13
+ 
+-->//Troque capacity of the disk brake Mt (N-m)
+ 
+-->Mt = 1500
+ Mt  =
+ 
+    1500.  
+ 
+-->//Number of caliper brakes on the wheel nb
+ 
+-->nb = 3
+ nb  =
+ 
+    3.  
+ 
+-->//Number of pads on each caliper brake np
+ 
+-->np = 2
+ np  =
+ 
+    2.  
+ 
+-->//Coefficient of friction mu
+ 
+-->mu = 0.35
+ mu  =
+ 
+    0.35  
+ 
+-->//Average pressure on the pad pavg (MPa)
+ 
+-->pavg = 2
+ pavg  =
+ 
+    2.  
+ 
+-->//R/e ratio r
+ 
+-->r = 0.2
+ r  =
+ 
+    0.2  
+ 
+
+Radius of the pad(R) = 28.625602 mm
+ 
+\ No newline at end of file