diff --git a/src/ng/directive/input.js b/src/ng/directive/input.js
index 4c55adc8cf5b..dd6e7aed8555 100644
--- a/src/ng/directive/input.js
+++ b/src/ng/directive/input.js
@@ -1000,7 +1000,7 @@ function baseInputType(scope, element, attr, ctrl, $sniffer, $browser) {
   element.on('change', listener);
 
   ctrl.$render = function() {
-    element.val(ctrl.$isEmpty(ctrl.$viewValue) ? '' : ctrl.$viewValue);
+    element.val(ctrl.$isEmpty(ctrl.$modelValue) ? '' : ctrl.$viewValue);
   };
 }
 
@@ -1192,8 +1192,7 @@ function urlInputType(scope, element, attr, ctrl, $sniffer, $browser) {
   stringBasedInputType(ctrl);
 
   ctrl.$$parserName = 'url';
-  ctrl.$validators.url = function(modelValue, viewValue) {
-    var value = modelValue || viewValue;
+  ctrl.$validators.url = function(value) {
     return ctrl.$isEmpty(value) || URL_REGEXP.test(value);
   };
 }
@@ -1205,8 +1204,7 @@ function emailInputType(scope, element, attr, ctrl, $sniffer, $browser) {
   stringBasedInputType(ctrl);
 
   ctrl.$$parserName = 'email';
-  ctrl.$validators.email = function(modelValue, viewValue) {
-    var value = modelValue || viewValue;
+  ctrl.$validators.email = function(value) {
     return ctrl.$isEmpty(value) || EMAIL_REGEXP.test(value);
   };
 }
@@ -1260,7 +1258,7 @@ function checkboxInputType(scope, element, attr, ctrl, $sniffer, $browser, $filt
     element[0].checked = ctrl.$viewValue;
   };
 
-  // Override the standard `$isEmpty` because a value of `false` means empty in a checkbox.
+  // Override the standard `$isEmpty` because an empty checkbox is always not equal to the trueValue
   ctrl.$isEmpty = function(value) {
     return value !== trueValue;
   };
@@ -1719,7 +1717,7 @@ var NgModelController = ['$scope', '$exceptionHandler', '$attrs', '$element', '$
    * default. The `checkboxInputType` directive does this because in its case a value of `false`
    * implies empty.
    *
-   * @param {*} value Reference to check.
+   * @param {*} value model value to check.
    * @returns {boolean} True if `value` is empty.
    */
   this.$isEmpty = function(value) {
@@ -2463,8 +2461,8 @@ var requiredDirective = function() {
       if (!ctrl) return;
       attr.required = true; // force truthy in case we are on non input element
 
-      ctrl.$validators.required = function(modelValue, viewValue) {
-        return !attr.required || !ctrl.$isEmpty(viewValue);
+      ctrl.$validators.required = function(value) {
+        return !attr.required || !ctrl.$isEmpty(value);
       };
 
       attr.$observe('required', function() {
@@ -2519,7 +2517,7 @@ var maxlengthDirective = function() {
         ctrl.$validate();
       });
       ctrl.$validators.maxlength = function(modelValue, viewValue) {
-        return ctrl.$isEmpty(viewValue) || viewValue.length <= maxlength;
+        return ctrl.$isEmpty(modelValue) || viewValue.length <= maxlength;
       };
     }
   };
@@ -2538,7 +2536,7 @@ var minlengthDirective = function() {
         ctrl.$validate();
       });
       ctrl.$validators.minlength = function(modelValue, viewValue) {
-        return ctrl.$isEmpty(viewValue) || viewValue.length >= minlength;
+        return ctrl.$isEmpty(modelValue) || viewValue.length >= minlength;
       };
     }
   };
diff --git a/test/ng/directive/inputSpec.js b/test/ng/directive/inputSpec.js
index 169c8d6da9b7..5d923662a783 100644
--- a/test/ng/directive/inputSpec.js
+++ b/test/ng/directive/inputSpec.js
@@ -3805,7 +3805,7 @@ describe('input', function() {
 
 
     it('should be required if false', function() {
-      compileInput('<input type="checkbox" ng:model="value" required />');
+      compileInput('<input type="checkbox" ng-model="value" required />');
 
       browserTrigger(inputElm, 'click');
       expect(inputElm[0].checked).toBe(true);
@@ -3815,6 +3815,16 @@ describe('input', function() {
       expect(inputElm[0].checked).toBe(false);
       expect(inputElm).toBeInvalid();
     });
+
+    it('should set the ngTrueValue when required directive is present', function() {
+      compileInput('<input type="checkbox" ng-model="value" required ng-true-value="\'yes\'" />');
+
+      expect(inputElm).toBeInvalid();
+
+      browserTrigger(inputElm, 'click');
+      expect(inputElm[0].checked).toBe(true);
+      expect(inputElm).toBeValid();
+    });
   });