How to Change Brake Pads on a 2015 Yamaha YZ85
Shop parts for a 2015 Yamaha YZ85 Dirt Bike.Why keeping the brakes fresh matters on the YZ85
The 2015 Yamaha YZ85 is a high-revving youth motocrosser with light weight and nimble handling. That makes consistent braking feel and power important for lap times and rider confidence. Like most modern dirt bikes including the YZ85, it uses hydraulic disc brakes – a master cylinder and lever or pedal pressurize fluid that pushes caliper pistons so brake pads clamp a steel rotor. Worn pads reduce stopping power, change lever feel, and can damage rotors, so replace them promptly when needed.
Brake system, in brief
- Brake lever (front) or pedal (rear) & master cylinder – creates hydraulic pressure.
- Hydraulic brake line – carries fluid to the caliper.
- Brake caliper – houses pistons that push pads.
- Brake pads – friction material that contacts the rotor.
- Brake rotor – steel disc attached to the wheel that the pads squeeze.
Hydraulic pressure forces the pads against the rotor to slow the bike. The YZ85 typically has a single-disc front and rear setup appropriate for youth motocross loads; caliper and rotor sizes for 2015 are common to this category.
When to replace brake pads on your YZ85
Watch for these signs:
- Reduced braking power or poor modulation.
- Squealing, squeaking, or a grinding noise when braking.
- Excessive lever or pedal travel before engagement.
- Visible pad material worn thin – less than 2 mm friction material or backing plate showing.
- Heat discoloration, scoring, or grooving on the rotor surface.
Inspect pads after muddy rides or long track days. Replace sooner if you ride aggressively or heavily brake downhill, as smaller-displacement bikes still generate significant heat in repeated stops.
Tools & supplies you'll need
- New brake pads designed for 2015 Yamaha YZ85
- Basic socket or wrench set, pliers
- Flat-head screwdriver or punch for retaining pin if needed
- Brake cleaner & clean shop rags
- Small C-clamp or dedicated piston tool (or old pad to press pistons)
- Torque wrench for axle and critical fasteners
- Optional: wheel stand to lift and stabilize the bike
Step-by-step – changing the brake pads on a 2015 Yamaha YZ85
- Prepare the bike and workspace. Park on level ground, cool brakes, and block the bike so it won't move. A simple stand under the frame or skid plate works for the YZ85.
- Support the bike safely. Use a solid stand so the wheel you're working on is free to rotate if you keep the wheel on. If you prefer wheel removal, support the swingarm or fork with a jack or block.
- Remove the wheel if needed. On many YZ85 setups you can access the caliper with the wheel on, but removing the wheel gives better access. Loosen axle nuts, remove axle, pull wheel out, and set aside.
- Access the caliper. Remove any caliper mounting bolts or unclip the caliper retaining clip/pin that holds the pads. Keep track of hardware orientation.
- Remove the retaining pin or clip. Use pliers or a punch to remove the cotter-style pin or spring clip. On the YZ85 the retaining system is simple – remove it carefully and store for reuse.
- Slide the old pads out. Pull the pads free of the caliper bracket. Note inner vs. outer pad orientation and any shims or anti-rattle springs.
- Inspect rotor and caliper. Check rotor for scoring, cracks, or severe warping. Look for leaks at the caliper or master cylinder. Clean dirt and mud from the caliper body and bracket with brake cleaner and a rag.
- Compress the caliper piston(s). Use a C-clamp or pad tool to push pistons back into the caliper housing until they are flush. Place an old pad against the piston face to avoid damaging seals. This makes room for the new pad thickness.
- Install new pads. Slide the new pad set into the caliper in the same orientation as the old pads. Replace any shims or spring clips. Make sure friction material faces the rotor.
- Reinstall retaining hardware. Insert the pad retaining pin or clip and secure it as originally positioned. Confirm it is fully seated and any locking tab or cotter is engaged.
- Reinstall wheel if removed. Fit the wheel back into the forks or swingarm, align the rotor between pad faces, insert the axle, and torque axle nuts to spec. Spin the wheel to ensure it turns freely without rubbing.
- Restore hydraulic pressure. Pump the brake lever or pedal several times until a firm feel returns. This pulls the pads into proper contact with the rotor. If lever travel remains excessive, inspect for air in the line or fluid leaks – basic pad changes rarely require bleeding unless fluid overflowed when compressing pistons.
- Final check. Ensure all fasteners are tight, retaining clip is secure, and rotor spins without dragging. Confirm brake light (if equipped) functions when lever/pedal pressed.
Helpful inspection tips while you're in there
- Check rotor thickness & surface condition – heavy grooves or blue discoloration indicate heat damage and may require rotor replacement or resurfacing.
- Look for fluid leaks around the caliper piston seals and master cylinder.
- Ensure the caliper slides freely on its pins or mounting; sticky sliders cause uneven pad wear.
- Clean mud and grit out of the caliper bracket and around seals to prevent contamination of new pads.
- Confirm retaining pin and spring clip are straight and secure; replace bent hardware to avoid pad movement.
Bedding in new pads & test ride
After installation, bed the pads with a short warm-up and progressive stops: accelerate to a moderate speed and perform 8–10 controlled decelerations to about walking pace, avoiding full stops until the pads start to bite evenly. This helps transfer a thin, even layer of pad material to the rotor for consistent braking. After bedding, check lever feel and pad fitment again and make any minor adjustments.
Final notes
Changing brake pads on a 2015 Yamaha YZ85 is straightforward with common tools and a bit of patience. Regular inspection after muddy or hard-use sessions keeps braking performance consistent – an essential part of riding fast and staying in control on track or trail.
Related Shopping Categories
Shop Brake Pads for a 2015 Yamaha YZ85 Dirt Bike.
Shop Brake Rotors for a 2015 Yamaha YZ85 Dirt Bike.
Shop Brake Lines for a 2015 Yamaha YZ85 Dirt Bike.
Shop Brake Bleeders for a 2015 Yamaha YZ85 Dirt Bike.
Shop Brake Tools for a 2015 Yamaha YZ85 Dirt Bike.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.
