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Apec Technical Tips

 

Product Additions

 

Apec's vast range of parts covers 98% of all cars and LCVs in the UK and Ireland. To make sure this unrivalled level of coverage is maintained, Apec constantly introduce new parts to service manufacturers’ recently released models.

Click here to see Apec's product additions »

 

Technical Bulletins

 

Apec Tech Bulletin PAD 1208 Freelander
September 25th 2009

 

Apec Tech Bulletin Block Exemption
August 7th 2009

 

Apec Tech Bulletin SHU 623, SHU 624, SHU 661
July 21st 2009

 

Apec Tech Bulletin Catalogue Error
July 21st 2009

 

Apec Tech Bulletin Supersessions
July 21st 2009

 

Apec Tech Bulletin KITS
July 21st 2009

 

Apec Tech Bulletin DSK 2444
July 21st 2009

 

Apec Tech Bulletin DRM Transit
July 21st 2009

 

Apec Tech Bulletin ADB Adjuster Bars
July 21st 2009

 

Apec FAQ

 

Q1. Why should I change fitting kits?

Q2. What causes brake squeal?

Q3. Do Apec brake pads need bedding in?

Q4. What is R90?

 

Why should I change fitting kits?

 

The simple answer to this question is “to ensure correct operation of the brake assembly”.

 

Worn components can lose up to 50% of their tension during a 1 to 2 year period and this can cause:

  • Brake noise
  • Unequal brake wear
  • Unequal brake effort (brake pull)

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What causes brake squeal?

 

Brake squeal is probably one of the most common and frustrating problems that a car owner or garage can face. Squeal does not affect braking performance, assuming the friction material and other brake components are in good condition and are operating correctly.

 

Squeal is not generated by the friction material but is simply the result of pad vibration against the disc. To eliminate squeal you have to eliminate vibrations. The most common occurrence of squeal is at pad replacement. This is because the pad is not making full contact with the disc and bedding needs to take place. Once bedded, the squeal should disappear.

 

However, squeal can be persistent and if so, there are areas which should be checked.

 

An area that is often overlooked, and can contribute to squeal, is the caliper pins and sliding surfaces. If these metal to metal surfaces are dry, they can bind in operation, or chatter, resulting in squeal. These areas must be clean and lubricated using high temperature grease.

 

The second area is worn components within the brake caliper (also known as fitting kits). These springs keep the brake pad centralized in the brake caliper. The parts may look fine, but can lose their tension by up to 50% over a 1 to 2 year period. We recommend that all components are replaced when fitting new pads (see bulletin Importance of changing accessory kits). All Apec pads come with the correct shim or backing plates, some of which are specifically designed for certain applications.

 

All Apec Braking components are manufactured and thoroughly tested to equal or exceed full OE specification, R90 or other appropriate standards, to match manufacturers’ levels of performance, comfort and safety. Continual research into the correct use of chamfers and shims helps to eliminate squeal.

 

If all the above recommendations are observed, you should enjoy trouble free braking.

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Do Apec brake pads need bedding in?

 

All brake pads need to be bedded.

 

Both the pad and brake disc condition themselves during initial braking. Therefore it is essential that brake parts are bedded. It is recommended that normal braking is observed for the first 500 miles or greater if used on motorways. If abnormal braking or force bedding takes place on initial fitment, the disc can distort or the surface of the pad material can become burnt leaving a carbon layer which will reduce braking performance and the pad will take longer to bed and achieve maximum performance.

 

All Apec pads go through a process called HPT. This process, ‘High Pressure Treatment’ or ‘scorching’ burns off gases and resins that would normally do so during bedding. This achieves a superior initial performance known as “Green Performance” together with easier bedding and longer working life. This process is environmentally friendly as gases are removed at the factory rather than into the environment while on a vehicle.

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What is R90?

R90 (ECE90) is the European quality standard for friction materials, required for vehicles up to 3.5 ton (in the UK) and first registered after 1st April 2001, and is a legal requirement.

 

The friction material is compared against the performance of the OE material and specific vehicle application and must achieve a performance of +15% or -15% of OE material. Testing takes place on vehicle and dynamometer simulation. Specific requirements can be seen on comparison below.

 

Packaging, pads and shoes must be marked with a defined set of information, such as the approval number and the applications for which the product is approved. The box containing the product must be tamper-proof and contain fitting instructions in the language of the country in which it is sold.

 

All Apec friction products have R90 approval where necessary. However the Apec product exceeds the legal requirement and a chart below shows the testing protocol used. Furthermore, Apec has an environmental responsibility. Apec uses no heavy metal and has adopted a process called HPT which removes harmful gases at the manufacturing facility which are normally emitted during brake bedding.

 

Apec comparison Table

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