Click to zoom in
Keep contaminants away from a 38 mm caliper piston
Brembo 20487245 is a single replacement dust boot for compatible Brembo calipers using a 38 mm piston and dotted reference 20.4872.45. It restores the external flexible barrier around the piston during a correctly matched caliper service.
Key Features
- Sized for a compatible 38 mm brake-caliper piston
- Genuine Brembo service component
- Flexible black elastomer construction
- Protects the exposed piston area from dust, moisture, and debris
- Sold individually
- Selected by exact part number, piston diameter, boot profile, and caliper groove
Fitment
| Application | Required Piston Size | Required Reference | Exclusions |
|---|---|---|---|
| Compatible Brembo brake-caliper service | 38 mm | 20.4872.45 | No year-make-model fitment is guaranteed; do not use with a different piston diameter, boot profile, or caliper groove |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | 20487245 |
| Brembo Dotted Reference | 20.4872.45 |
| Product Type | Brake-caliper piston dust boot |
| Compatible Piston Diameter | 38 mm |
| Material | Black protective elastomer |
| Quantity | One |
| Condition | New |
What's Included
- One Brembo 38 mm brake-caliper piston dust boot
- Caliper piston, hydraulic pressure seal, bleeder, pad hardware, brake fluid, tools, and installation labor are not included
About Brembo
Brembo develops original-equipment and performance braking systems, including calipers, rotors, pads, fluids, and service components. Caliper repair parts must be matched by exact reference, piston size, sealing profile, material, and groove design.
Related Parts
- Hydraulic piston seal verified for the same 38 mm Brembo caliper bore
- Caliper piston only when inspection confirms scoring, corrosion, or dimensional damage
- Brake fluid meeting the vehicle and caliper manufacturer's required specification
- Bleeder components and pad hardware verified for the exact caliper model
FAQ
What is the 20487245?It is one genuine Brembo brake-caliper piston dust boot for a compatible 38 mm piston application.
How many dust boots are included?One dust boot is supplied.
Is the hydraulic piston seal included?No. This listing is for the external dust boot only; the pressure seal, piston, bleeder, and other rebuild parts are not included.
Does piston diameter alone guarantee fitment?No. Confirm the Brembo reference, piston diameter, boot profile, and caliper groove before disassembly.
What does the dust boot protect?It helps shield the exposed piston area from brake dust, moisture, road debris, and abrasive contamination.
Can a damaged boot be reused?No. Replace a boot that is torn, heat-damaged, hardened, swollen, or unable to seat correctly.
Does this part have year-make-model fitment?No verified year-make-model application is assigned. Selection is based on the exact Brembo reference and caliper dimensions.
Should the caliper be serviced by a professional?Brake caliper work affects vehicle safety and should be completed by a qualified technician using the caliper manufacturer's current procedures.
Installation Instructions
- Confirm the exact Brembo reference, piston diameter, boot profile, and caliper groove before removing the caliper.
- Follow the vehicle and caliper manufacturer's safety procedure to raise the vehicle, remove the wheel, and isolate the brake system.
- Remove the caliper and piston using approved methods without scratching the piston or hydraulic bore.
- Discard the old dust boot and inspect the piston, bore, pressure-seal groove, and boot groove for corrosion, scoring, heat damage, or contamination.
- Clean the components only with brake-system-compatible materials and replace any damaged piston, seal, or caliper component.
- Lubricate and install the verified hydraulic seal and dust boot according to the caliper manufacturer's current procedure, confirming the boot is fully seated without twists or tears.
- Reassemble the caliper, torque all fasteners to the applicable specification, fill or bleed the brake system with the required fluid, and check for leaks.
- Verify firm pedal operation and correct brake function at low speed before returning the vehicle to normal service.
Brembo
Shop Brembo OE and performance brake pads, rotors, sensors, and complete brake kits by exact manufacturer part number, axle position, brake system, dimensions, and verified vehicle fitment. Brembo Brake Pads Compare application-specific PRIME ceramic and low-metallic pads, plus selected XTRA ceramic severe-duty listings. The product name identifies a particular pad range and application; it does not establish compatibility with every caliper on the same vehicle model. Match the part number, axle position, brake package and any production-date or option-code notes before choosing a set. For example, the collection includes separate front and rear pad listings for supported Toyota and Lexus applications, along with selected Audi, Porsche, Tesla, Honda and other vehicles. Coverage differs by component. Use the exact listing rather than treating a vehicle name as confirmation that every version uses the same brakes. Brembo Brake Discs and Rotors Shop selected OE-equivalent discs, includ...
View Brembo Products