# Introduction

Differential and Progressive brakes for X-Plane (aka "D\&P brakes") is a plugin that offers differential and progressive braking capabilities to X-Plane 11 & X-Plane 12 users.

It is natively recognized and supported by [Reality Expansion Pack (REP) from SimCoders](https://www.simcoders.com/).

It recognizes and supports the following aircrafts:

* Zibo 737-800
* Toliss A319
* Toliss A321
* TOGA Simulations MU-2 Marquise

### Description

In X-Plane 10 there was the possibility to use two buttons to simulate left and right toe brakes.\
In X-Plane 11 these commands have been removed and X-Plane 11 & 12 tries to simulate the differential brake action in a not so efficient way.\
Purpose of this script is providing the user custom commands similiar to those available in X-Plane 10.

**What do you mean when you say** "***X-Plane 11+*** ***tries to simulate the differential brake action*****"?**

Whenever you use the rudder, X-Plane 11+ applies a braking force on the related (left or right) tire.\
I've observed that:

* This seems to happen below 50 kts
* The force applied is almost 100% at very low speed and tends to be much less at speeds near 50 kts

This means that:

* You will have problems trying to taxi since the plane will be prone to stop.
* You will have problems during the takeoff roll below 50kts because a braking force will be applied even if not requested

You can observe this behaviour using the dataref editor.

* Choose the "Show Datarefs" option from the plugin menu
* Watch what happens to the following datarefs:
  * ***sim/cockpit2/controls/left\_brake\_ratio***
  * ***sim/cockpit2/controls/right\_brake\_ratio***