Millway Motorsport BMW M-Sport Rear Stainless Steel Brake Caliper Pistons | 90523-44-4
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You’ll earn 315 Laps
For 1 item, including VAT but excluding delivery.
How it works
Sign in before ordering. Earn 1 Lap for every whole £1 of eligible product spend, including VAT.
Delivery, gift cards, sale-priced or discounted items and trade purchases do not earn Laps.
Purchase Laps become available 30 days after payment. Returns and refunds remove Laps earned on refunded items; pending Laps are cancelled.
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Minimum spends include VAT and exclude delivery and ineligible products. Use one reward or discount code per order; it cannot be combined with any other product, order or shipping discount. Rewards apply only to eligible products and variants shown in your rewards profile. Returns and refunds remove the Laps earned on refunded items; pending Laps are cancelled. Spending Laps does not reduce your qualifying lifetime spend. Laps and standard reward codes do not expire.
Description
Millway Motorsport 90523-44-4 stainless steel rear brake caliper pistons are a track-focused replacement for the factory aluminium pistons used in a wide range of BMW M Sport and M-car rear Brembo calipers.
Repeated high-temperature track use can place considerable thermal load on the standard aluminium pistons. Millway machines these replacements from diamond-polished stainless steel and incorporates an air-gap design to reduce heat transfer between the brake pad and piston.
Key Features
- Diamond-polished stainless steel construction
- Designed for high-temperature track use
- Air-gap design helps reduce heat transfer from pad to piston
- Set of four rear caliper pistons
- Direct upgrade for compatible BMW/Brembo rear brake calipers
BMW Applications
Compatible with rear M Sport/Brembo brake calipers used on applications including BMW F20/F21 M135i and M140i, F22 M235i and M240i, F87 M2, F87 M2 Competition, F80 M3 and F82/F83 M4, plus other compatible BMW models using the same rear caliper.
Important Track-Use Note
These pistons are intended for track-focused use and do not provide a provision for the original dust seals. They are therefore not intended as an OE-style road replacement where maintaining the factory dust-seal arrangement is required.
Professional brake-system installation is strongly recommended.
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Millway part number: 90523-44-4.
More information
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Warranty, Shipping and Returns
Products are supplied with the applicable manufacturer warranty. We offer UK and worldwide shipping. Please refer to the live availability information and our shipping and returns policies before ordering. Contact us if you need to confirm compatibility, intended use or any product-specific conditions.
Finance Options
Available payment options and current terms are shown at checkout. Instalment options depend on the provider and eligibility. Please review the terms displayed before confirming your payment.
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Why buy from us?
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Specifications
- Brand
- Millway Motorsport
- Product type
- Brake Caliper Pistons
- SKU:
- MW90523-44-4
- Vehicle make
- BMW
- Vehicle model
- M2, M3, and M4
- Vehicle variant
- F87, F80, F82, and F83
You’ll earn 315 Laps
For 1 item, including VAT but excluding delivery.
How it works
Sign in before ordering. Earn 1 Lap for every whole £1 of eligible product spend, including VAT.
Delivery, gift cards, sale-priced or discounted items and trade purchases do not earn Laps.
Purchase Laps become available 30 days after payment. Returns and refunds remove Laps earned on refunded items; pending Laps are cancelled.
This estimate follows your selected option and quantity. Checkout discounts can change eligibility. Bundle prices count once. Appstle records the final award after payment.
Sign in, open Spend Laps and choose an available reward. Redeem your Laps, copy your unique discount code and enter it at checkout using the same customer account.
Your tier makes your Laps go further: 1,000 Laps are worth £10 at Rookie, £12.50 at Contender, £20 at Pro or £25 at Champion. Choose £5 off £100, £10 off £200, £25 off £500 or £50 off £1,000 of eligible products.
Minimum spends include VAT and exclude delivery and ineligible products. Use one reward or discount code per order; it cannot be combined with any other product, order or shipping discount. Rewards apply only to eligible products and variants shown in your rewards profile. Returns and refunds remove the Laps earned on refunded items; pending Laps are cancelled. Spending Laps does not reduce your qualifying lifetime spend. Laps and standard reward codes do not expire.
Need help?
Product questions answered
Helpful answers before you order. Need more detail? Our team can help.
Which brake specification do I need?
Confirm the axle, fitted caliper and disc dimensions against the listing. Different factory brake packages can be fitted to the same model. If you are unsure, send us your vehicle details and photographs of the current brakes before ordering.
How do I choose between road and track options?
Tell us whether the car is used on the road, for occasional track days or for competition. Check the stated compound or product specification, and any usage restrictions in the listing. We can help you compare the available options for your intended use.
When will my order arrive?
Select your required option and check the live availability message above. Dispatch is when your order leaves us; delivery takes additional time and depends on the service and destination. If no verified lead time is shown, or you need the item for a fitting appointment or event, contact Nineteen72 Performance before ordering.
What is included in the price?
Check the product description, selected option and stated quantity before ordering. Images may show optional equipment or an example installation. If you need a matching pair, a complete kit or additional hardware, ask us to confirm exactly what is included.
How do I get help before ordering?
Contact Nineteen72 Performance with a link to this product and your question. For vehicle-specific parts, include your model, year, engine and any modifications that may affect compatibility.
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