Brake Caliper Pistons Ø 28–44 mm

Brake pistons with scoring, corrosion damage, or leaks (pressure loss) compromise the safety and performance of your braking system. Our precision-manufactured replacement brake pistons made of hard-anodized aluminum are suitable for overhauling, reconditioning, and servicing fixed calipers with 2, 4, 6, or 8 pistons. Every size is available in four designs (Type 1–4) – the price per piece is identical for all types.

Selection Note: Before ordering, please measure the exact diameter (D1) of your removed piston and identify its design. State the required type (Type 1, 2, 3, or 4) or your measured dimensions (H1, h2, d2) in the order comments during checkout. Pistons are supplied individually and without a seal kit.

Available Sizes and Part Numbers

Diameter	Part Number	Designs	Shop Link
Ø 28 mm	94.4225.01	Type 1, 2, 3, 4	View product »
Ø 30 mm	94.4225.02	Type 1, 2, 3, 4	View product »
Ø 32 mm	94.4225.03	Type 1, 2, 3, 4	View product »
Ø 34 mm	94.4225.04	Type 1, 2, 3, 4	View product »
Ø 36 mm	94.4225.05	Type 1, 2, 3, 4	View product »
Ø 38 mm	94.4225.06	Type 1, 2, 3, 4	View product »
Ø 40 mm	94.4225.07	Type 1, 2, 3, 4	View product »
Ø 42 mm	94.4225.08	Type 1, 2, 3, 4	View product »
Ø 44 mm	94.4225.09	Type 1, 2, 3, 4	View product »

Designs at a Glance

Brake pistons with the same nominal diameter exist in four designs depending on caliper model, installation position, and sealing system:

Type 1: Cylindrical piston for calipers with internal scraper ring.
Type 2: Cylindrical piston with stepped top / recess for calipers with scraper ring.
Type 3: Piston with stepped flat top and groove for mounting a dust boot.
Type 4: Piston with stepped chamfered top (with bevel) and groove for dust boot – also a direct replacement for previous ceramic piston versions.

How to Identify the Right Type: Check the Dimensions

Compare the dimensions of your removed piston with the technical diagram in the product images:

D1: Outer piston diameter (nominal dimension)
H1: Overall piston height
h2: Base depth / height up to the inner recess
d2: Top diameter at the dust boot seat (for Type 3 and Type 4)

Matching Seals & Dust Boots

For a complete overhaul you will also need new seals and dust boots. Matching parts as well as seal conditioner can be found in our dust seal & dust cover size overview.

Frequently Asked Questions

Is a seal kit included?

No. Each brake piston is supplied individually, without seals or dust boot.

Which type do I need?

Type 1 and Type 2 are for calipers with an internal scraper ring, Type 3 and Type 4 for calipers with an external dust boot. Compare the dimensions D1, H1, h2, and d2 of your old piston with the diagram.