Restore reliable brake caliper performance with the All Balls Brake Caliper Piston Kit, manufacturer part number 18-9004 and vendor part number 21-89004. Designed for select KTM motorcycles, this rebuild kit includes the piston or pistons required to rebuild one caliper. It is a practical replacement for worn, corroded, or damaged original components.
The piston is precision machined from high-grade 304 stainless steel for excellent durability and corrosion resistance. Stainless steel reduces thermal conductivity by up to 93% compared with aluminum, helping limit heat transfer through the caliper during demanding riding. This design also avoids common issues associated with plastic composite pistons, which can become brittle with age, as well as OEM chrome-plated steel and aluminum pistons that may corrode over time. The kit also eliminates failure-prone ceramic inserts found on some KTM models.
Fitment includes the 2001-2005 KTM 125 EXC, 2001-2002 KTM 250 SX, 2001 KTM 250 SXS, and 2001-2002 KTM 400 EXC 4-Stroke. Verify the model year, motorcycle model, and caliper application before installation. The All Balls 18-9004 kit is intended for rebuilding one caliper and is suitable for maintenance, restoration, or replacement of deteriorated brake piston components.
Features:
- Precision machined from high-grade 304 stainless steel
- Reduces thermal conductivity by up to 93% compared with aluminum
- Resists corrosion associated with OEM chrome-plated steel and aluminum pistons
- Provides a durable alternative to plastic composite pistons that may become brittle with age
- Eliminates failure-prone ceramic inserts found on some KTM models
- Includes the piston or pistons needed to rebuild one caliper
- Fits select 2001-2005 KTM 125 EXC, 2001-2002 KTM 250 SX, 2001 KTM 250 SXS, and 2001-2002 KTM 400 EXC 4-Stroke models
Fitment:
2001 KTM 125 Exc
2001 KTM 125 SX
2001 KTM 200 Exc
2001 KTM 200 Mxc
2001 KTM 200 Sx
2001 KTM 250 EXC
2001 KTM 250 EXC-G Racing
2001 KTM 250 MXC
2001 KTM 250 SX
2001 KTM 250 SXS
2001 KTM 300 EXC
2001 KTM 300 MXC
2001 KTM 380 Exc
2001 KTM 380 Mxc
2001 KTM 380 Sx
2001 KTM 400 EXC 4-Stroke
2001 KTM 400 MXC 4-Stroke
2001 KTM 520 EXC 4-Stroke
2001 KTM 520 MXC 4-Stroke
2002 KTM 125 Exc
2002 KTM 125 SX
2002 KTM 200 Exc
2002 KTM 200 Mxc
2002 KTM 200 Sx
2002 KTM 250 EXC
2002 KTM 250 EXC-G Racing
2002 KTM 250 SX
2002 KTM 300 EXC
2002 KTM 300 MXC
2002 KTM 380 Exc
2002 KTM 380 Sx
2002 KTM 400 EXC 4-Stroke
2002 KTM 400 MXC 4-Stroke
2002 KTM 520 EXC 4-Stroke
2002 KTM 520 MXC 4-Stroke
2003 KTM 125 Exc
2003 KTM 200 Exc
2003 KTM 200 Mxc
2003 KTM 250 EXC
2003 KTM 250 EXC-G Racing
2003 KTM 300 EXC
2003 KTM 300 MXC
2003 KTM 450 MXC 4-Stroke
2003 KTM 525 EXC 4-Stroke
2003 KTM 525 MXC 4-Stroke
2004 KTM 125 Exc
2004 KTM 250 EXC-G Racing
2005 KTM 125 Exc
2005 KTM 250 EXC-G Racing
2006 KTM 250 EXC-G Racing