Pad and Rotor Bed-In Theory, Definitions and Procedures
StopTech's Recommended Procedure for Bedding-in Stock-Sized Brake Systems

by Matt Weiss of StopTech and James Walker, Jr. of scR motorsports

When a system has both new rotors and pads, there are two different objectives for bedding-in a performance brake system: heating up the brake rotors and pads in a prescribed manner, so as to transfer pad material evenly onto the rotors; and maturing the pad material, so that resins which are used to bind and form it are ‘cooked' out of the pad.

The first objective is achieved by performing a series of stops, so that the brake rotor and pad material are heated steadily to a temperature that promotes the transfer of pad material onto the brake rotor friction surface. There is one pitfall in this process, however, which must be avoided. The rotor and, therefore, the vehicle should not be brought to a complete stop, with the brakes still applied, as this risks the non-uniform transfer of pad material onto the friction surface.

The second objective of the bedding-in process is achieved by performing another set of stops, in order to mature the pad itself. This ensures that resins which are used to bind and form the pad material are ‘cooked' out of the pad, at the point where the pad meets the rotor's friction surface.

The bed-in process is not complete until both sets of stops have been performed.

Bedding-in Street Performance Pads

For a typical performance brake system using street-performance pads, a series of ten partial braking events, from 60mph down to 10mph, will typically raise the temperature of the brake components sufficiently to be considered one bed-in set. Each of the ten partial braking events should achieve moderate-to-high deceleration (about 80 to 90% of the deceleration required to lock up the brakes and/or to engage the ABS), and they should be made one after the other, without allowing the brakes to cool in between.

Depending on the make-up of the pad material, the brake friction will seem to gain slightly in performance, and will then lose or fade somewhat by around the fifth stop (also about the time that a friction smell will be detectable in the passenger compartment). This does not indicate that the brakes are bedded-in. This phenomenon is known as a green fade, as it is characteristic of immature or ‘green' pads, in which the resins still need to be driven out of the pad material, at the point where the pads meet the rotors. In this circumstance, the upper temperature limit of the friction material will not yet have been reached.

As when bedding-in any set of brakes, care should be taken regarding the longer stopping distance necessary with incompletely bedded pads. This first set of stops in the bed-in process is only complete when all ten stops have been performed - not before. The system should then be allowed to cool, by driving the vehicle at the highest safe speed for the circumstances, without bringing it to a complete stop with the brakes still applied. After cooling the vehicle, a second set of ten partial braking events should be performed, followed by another cooling exercise. In some situations, a third set is beneficial, but two are normally sufficient.

Bedding-in Club Race or Full Race Pads

For a typical performance brake system using race pads, the bed-in procedure must be somewhat more aggressive, as higher temperatures need to be reached, in order to bring certain brands of pad material up to their full race potential.

We typically recommend a set of ten partial braking events, from 60mph down to 10mph, followed immediately by three or four partial braking events, from 80mph down to 10mph. Alternately, a set of eleven stops, from 80mph to 40mph, or a set of seven stops, from 100mph to 50mph, would be approximately the same. As with street pads, each of the partial braking events should achieve moderate-to-high deceleration (about 80% of the deceleration required to lock up the brakes and/or to engage the ABS), and they should be made one after the other, without allowing the brakes to cool in between.

Again, depending on the make-up of the pad material, the brake friction will seem to gain slightly in performance, and will then lose or fade somewhat about halfway through the first set of stops. This does not indicate that the brakes are bedded-in, except where race-ready pads are being used. This phenomenon is the same as that which occurs with high-performance or street pads (except that, when race-ready pads are used, they do not exhibit green fade, and they will be bedded-in after just one complete set of stops).

As when bedding-in any set of brakes, care should be taken regarding the longer stopping distance necessary with incompletely bedded pads. This first set of stops in the bed-in process is only complete when the recommended number of stops has been performed - not before. As a general rule, it would be better to perform additional stops, than not enough. The system should then be allowed to cool, by driving the vehicle at the highest safe speed for the circumstances, without bringing it to a complete stop with the brakes still applied.

After cooling the vehicle, a second set of the recommended number of stops should be performed, followed by another cooling exercise. In some situations, a third set is beneficial, but two are normally sufficient.

Racers will note that, when a pad is bedded-in properly, there will be approximately 2mm (0.1 inch) of the pad edge near the rotor, on which the paint will have turned to ash, or the color of the pad will have changed to look as though it has been overheated.

Source: Stoptech.com

Part No Applications: NMB1100, NMB1101, NMB1103, NMB1104, NMB1105, NMB1106, NMB1107, NMB1110, NMB1111, NMB1130, NMB1131, NMB1200, NMB1201, NMB1210, NMB2016, NMB2017, NMB2018, NMB2036, NMB2037, NMB2038, NMB2045, NMB2046, NMK3001, NMK3002, NMK3202, NMK3203, NMK3204, NMK3205

Article Date: Oct 23, 2007
Car Accociations: NEW_MINI
Hits: 633

Order and Shipping Information

Worldwide Shipping Charges
Shipping Address Policy
Worldwide General Shipping Information
Shipping Schedule
When Will I Get My Order?
Entering APO/FPO Addresses
Backorders

World-Wide Shipping Charges

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UPS Ground Delivery Transit time Map for Domestic Customers

FedEx Ground Service Delivery Map

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  Following these steps will ensure that you're charged the correct shipping amount and that your order will be delivered in a timely fashion. All shipments to APO/FPO addresses are sent via U.S. Priority or First Class Mail. We estimate 5 to 7 business days for delivery once the order has been shipped; however, some destinations may take up to 21 days.

  
  
  
  
  
  

  Backorders

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We will match the published price of any US supplier* -- even their current sales prices! If you find an item advertised at a lower price, make a notation in your online order, call or email us your price match request (see terms and details below). We'll sell you the SAME item at the SAME price! If you've already purchased the item from us, we'll even price match (for store credit only) as long as you contact us with your request within 10 days of placing your order.

This offer is restricted to identical items offered for sale in writing or on the web. When making your price match request, you must provide us with a link to the competitor's Internet URL for the item, a copy of the written ad or written quotation, which must include suppliers part number, description and price.

Price Match Terms and Fine Print

We may choose not to price match in some cases; here are some reasons why:

• The competitor's product is not an exact match (identical manufacturer & model) with ours.
• The competitor with the lower price does not have the item in stock at their warehouse.
• The competitor's total price (including shipping, handling, rebates, taxes, etc.) is higher.
• The competitor's product is used, refurbished, reconditioned, or a display model.
• The competitor is not selling in US dollars.
• The product is a clearance or closeout item.
• The item is not found within the first 10 items listed on major search engine results.
• The competitor is not manufacturer authorized or has advertised below the manufacturers minimum allowed price for the item.

* Qualified U.S. Suppliers are established businesses that routinely and regularly sell the item to be matched from an established physical storefront or warehouse.

While we endeavor to maintain the accuracy of item availability, descriptions and availability, we reserve the right to correct errors. We reserve the right to choose not to honor this offer.

How to Request a Price Match

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Alternately, you may call us with your request. We'd love to talk with you. We will generally respond to price match requests within one business day.

SHIPMENT PROBLEMS?

Claims for missing items or error in shipment must be reported within 5 days of order receipt .

BACKORDERS

We endeavor to stock most of the items we sell. For Classic Minis, parts are frequently in limited supply and are difficult to keep on hand. the automatic shipment notification email you receive will identify backordered items and indicate the approximate date we expect to receive the item at our warehouse.

Be sure to contact us if you wish to cancel your backorder to avoid unnecessary shipping and restocking charges once the item(s) you’ve ordered is shipped.

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