Mars Caravan Brake Controller Setup (Gain Settings & First Drive Checks)

Brake Controller Setup + First Drive Checks

Brake Controller Setup + First Drive Checks

A properly set brake controller improves braking performance, stability, and safety. This guide covers a simple setup approach and the first-drive checks we recommend for Mars caravan owners.

Note: Brake controller models differ. Use your controller manual for exact button names.

What a brake controller does

The brake controller tells the caravan brakes how much braking to apply when you brake the tow vehicle. Too little = the van pushes the car. Too much = the van brakes too aggressively.

Initial setup (simple method)

  1. Find a safe, flat area with room to stop (quiet road/industrial area).
  2. Set the controller gain/output to a low-to-mid starting point.
  3. Accelerate to a low speed (e.g., slow suburban speed) and apply brakes gently.
  4. If the van feels like it’s pushing the vehicle, increase gain slightly.
  5. If the van grabs or feels harsh, reduce gain slightly.
  6. Repeat small adjustments until stopping feels smooth and controlled.

Manual override test (if your controller has it)

Many controllers have a manual override lever/button that applies trailer brakes without vehicle brakes. Used correctly, it helps confirm trailer brakes are responding.

  • At very low speed, apply manual override gently.
  • You should feel the van braking.
  • If you feel nothing, check the trailer plug connection and controller settings.

After the first 10–20km (or after towing changes)

  • Pull over safely and do a quick walkaround.
  • Check tyres visually for any issues.
  • Check for unusual heat around hubs/brakes (carefully).
  • Confirm breakaway cable is secure and plug connection is still seated.

Listen and feel

  • Any new vibrations, pulling, or instability should be investigated early.
  • If braking feels inconsistent, re-adjust gain slightly and re-test.

Common causes of poor braking feel

  • Incorrect gain setting
  • Loose trailer plug connection
  • Wet/dirty brake components after storage or water crossings
  • Overloading or poor weight distribution
  • Brake controller not calibrated (some models need initial calibration)

When to stop and contact support

  • Brakes feel weak even with gain increased
  • Brakes grab harshly and cannot be tuned out
  • Trailer plug gets hot or shows scorch marks
  • You notice smoke, burning smell, or excessive heat at hubs/brakes

What to include in a support ticket (if needed)

  • Mars model + year
  • Tow vehicle make/model
  • Brake controller brand/model
  • Description of braking feel (pushing, grabbing, inconsistent)
  • Photos of trailer plug and any warning signs (heat/scorching)
  • Short video of controller behaviour if relevant

Next in this series: Tyre Pressures — Highway vs Gravel vs Sand (Practical Starting Points)

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