M&G Original Brake System

A supplement brake system that will fit a towed vehicle equipped with a normal master cylinder and booster brake system.

*Please check vehicle compatibility to see if your vehicle is listed. If part # is *2.0, vehicle is NOT compatible.

In 1987, we set the standards for supplemental brake systems, And We are Still The Best. M&G Braking Systems are the most effective braking control system on the aftermarket today. Our system can solve your motor coach/towed vehicle braking problems!  No Other Supplemental Brake System can match our performance & reliability.

For this type braking system, an air cylinder is mounted between the master cylinder and vacuum booster on the towed vehicle. An air pressure line is connected to the motor coach's air brake system and extended to the air cylinder on the towed vehicle, with a quick disconnect. This added margin of safety can help protect your life, the well-being of your passengers and the tremendous investment you have in your recreational vehicles.

When the towed vehicle is disconnected and being driven independently, the M&G Car Braking System air cylinder simply acts as a pushrod. This added margin of safety can help protect your life, the well-being of your passengers and the huge investment you have in your RV and towed vehicles.

  • Pneumatically Operated
  • Quick & Easy Air Line Hook Up
  • Truly proportional on 1 to 1 basis
  • Does not affect Toad Braking
  • No Electronics involved in
  • Braking System
  • Simplistic Fail-Safe Design
  • One moving part
  • No Maintenance
  • No Box To Store
  • No Adjustment Necessary

Original Brake System Instructions for Towed Vehicle

(Download instructions as a PDF)

  1. Remove vacuum hose from vacuum booster. Remove master cylinder from vacuum booster. Remove o-ring from the master cylinder.
  2. Place M&G cylinder on vacuum booster studs. Be sure that vacuum booster push rod slips inside of screw B. There should be a gap between M&G and vacuum booster. Do not push brake cylinder with force onto studs. This will move piston and throw off adjustment. Remove M&G and turn B clockwise (set screw will thread in about 2”) until there is no gap and you can hold M&G against vacuum booster with no resistance (you are looking for a small gap between push rod and set screw). Once zero clearance is found turn screw B ¼ of a turn clockwise to allow for error or expansion of metal. Secure screw B with 290 Loctite (green). Place just a drop between threads to allow it to run into threads. DO NOT allow Loctite to run on O.D. of shaft A. If adjustments need to be changed after Loctite has set, a small torch can be used to break loose. (heat until Loctite starts to smoke). DO NOT use pliers or vise to hold 7/8” shaft, protect shaft from scatches.
  3. Hold M&G up to master cylinder if no gap is present turn shaft C counter- clockwise until a gap is present. This method of adjustment is same as in #2. Turn rod C. clockwise until no gap is present or two pieces meet together. Also turn ¼ of turn clockwise after zero clearance is found. Adjustment is necessary on both ends of M&G cylinder. Loctite is used on both ends also, but use sparingly.
  4. Install o-ring on vacuum booster end of M&G.(if no oring is found look inside vacuum booster and oring should be hanging on pushrod).
  5. Fasten M&G to vacuum booster.
  6. Reposition master cylinder to bolt to M&G and secure.
  7. M&G cylinder is permanently lubricated so no maintenance is required.
  8. Run ¼ “ plastic air line (DOT approved) from M&G cylinder to breakaway system or front of vehicle. Attach SILVER MALE quick disconnect to front of vehicle. This fitting MUST remain open to allow system to breathe. DO NOT seal end of quick disconnect. Use spark plug boot to cover fitting.
  9. Vehicle MUST be driven for at least 2 miles without using the brake pedal, only use the parking brake and gear down when necessary to stop. After vehicle is stopped, go out and feel the front rotors for heat. If rotors are cool to touch, adjustments are correct. If rotors are hot, adjustments are too long (readjustment is necessary).
  10. If vehicle passes previous test, drive towed vehicle normal for 2 miles using brake pedal frequently. Rotors will be hot, but not smoking. Place vehicle in neutral and you should be able to move vehicle without resistance. If vehicle does not move call M&G for further assistance.


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