Read this Bug Issue: http://bugs.jquery.com/ticket/11586
Quoting the RFC 2616 Fielding
The
DELETEmethod requests that the origin server delete the resource identified by the Request-URI.
So you need to pass the data in the URI
$.ajax({
url: urlCall + '?' + $.param({"Id": Id, "bolDeleteReq" : bolDeleteReq}),
type: 'DELETE',
success: callback || $.noop,
error: errorCallback || $.noop
});