How to Change Honda Rancher TRX420 Front Brake Pads

Replacing the front brake pads on a Honda ATV doesn’t require any special tools, and it’s the most straightforward way to maintain your quad’s stopping power.

Honda Rancher 420 brake pads have a wear indicator, roughly the width of a credit card. If you wear down enough brake pad material, the indicator tells you it’s time to change the pads. Letting them go too long causes reduced stopping power because there’s less pad material to dissipate heat.

Honda Rancher 420 brake pads wear indicator

Watch the video above and follow the steps below to change the front brake pads on a Honda Rancher TRX420 ATV.

Tools and Supplies Needed - Honda Rancher 420 Front Brake Pads Replacement

Tools

  • 10mm, 12mm, 17mm sockets
  • 5mm Allen wrench or socket
  • Ratchet
  • Flat-blade screwdriver
  • Torque wrench

NOTE: You need to order two sets of the brake pads to do both the right and left sides. 

Honda Rancher 420 Front Brake Pads Change

Step 1. Lift the unit up and use an impact wrench to loosen the 17mm lug nuts on the wheel. If you don’t have an impact wrench, use a ratchet to break the lug nuts loose before you lift the unit up. 

Honda Rancher 420 front brake pads service

Step 2. Remove the two 10mm head bolts that hold in place the plastic guard protecting the caliper. 

Honda TRX420 Rancher front brake caliper

Step 3. Remove the two plastic caps on the back of the brake caliper with a flat-blade screwdriver. 

Honda Rancher TRX420 front brake pads caliper

Step 4. Break loose the 5mm Allen pins that hold the brake pads in place. You don’t need to remove them yet, just break them loose. 

Honda TRX420 Rancher brake pad pins

Step 5. Remove the brake caliper, which is held in place by two 12mm bolts. 

Honda Rancher TRX 420 front brake calipers

Step 6. Use a flat-blade screwdriver to push the old pads back into the caliper and compress the pistons. This makes room for the new brake pads. 

Honda ATV front brake pads change

Step 7. Use a 5mm Allen to remove the pins holding the brake pads in place. 

Honda Rancher ATV front brake pads change

Step 8. Flip the caliper over and lift the pads out. 

Honda 420 Rancher front brake caliper

Step 9. Clean the brake pad pins with a wire brush before installing the new pads. 

Honda TRX420 Rancher ATV brake pads change

Step 10. Install the new brake pads by sliding them into place. They’re identical, so it doesn’t matter which one is inside or outside. Line up the holes, then insert and thread in the pins.

Honda Rancher 420 front brake pads replacement

Honda TRX420 Rancher front brake pads replacement

NOTE: You may need to push in on the pads to get the holes for the pins to line up since there’s a spring in the caliper.

Step 11. Install the caliper by sliding it back over the brake rotor and replacing the 12mm bolts. Torque the bolts to 22 foot-pounds. 

Honda TRX420 ATV front brake pads service

Step 12. Use a 5mm Allen to torque the pad pins to 16 foot-pounds.

Honda Rancher ATV brake pads change

Step 13. Use a flat-blade screwdriver to replace the caps over the pins. 

Honda Rancher 420 brake pads replacement service

Step 14. Replace the plastic guard protecting the caliper. Add a little blue threadlocker to the two 10mm bolts that hold the guard in place.

Honda Rancher TRX420 ATV brakes service

Step 15. Pump the front brake lever a couple of times to get the pads back in place. 

Honda Rancher TRX420 front brake lever

NOTE: If you pushed the pistons back to make room for the new pads, this pushes the pistons back into position.

Step 16. Replace the wheel, then torque its 17mm lug nuts to 47 foot-pounds and you’re done.

Honda Rancher TRX 420 front brakes service

 

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