How can we help?

Placing An Order

Yes, please call our customer service team on +44 (0)1935 476255 to place an order via phone.

Yes, we sell via Demon Tweeks in the UK, and a number of other distributors shown below.

Demon Tweeks
75 Ash Road South
Wrexham Industrial Estate
Wrexham LL13 9UG
Phone: 01978 664466

ISA-Racing GmbH
August-Horch-Strasse 11
56736 Kottenheim
Telefon: +49 2651 / 96250

Turtle Trading Ltd
Tel No: 0429-465611

No, whilst an online account will make future purchases simpler, you can also check out as a guest.

If you have placed an order, and wish to make changes, please contact our customer service team on +44 (0)1935 476255 as soon as possible. We will try our best to accommodate any changes, however, if we have already started work on your order, unfortunately, we will be unable to do so. In this instance, you can always return it to us for a full refund. See our returns policy for more information.

We are committed to getting your order to you as quickly as possible. Delivery to a UK address typically takes 1-2 days. International delivery ranges from 2-10 days.

If some of the parts you have ordered are out of stock, we will notify you via e-mail. You will have the option for us to part ship the in-stock items immediately or wait for the entire order to become available. If we do not hear back from you within 5 days, we will automatically part ship all available items.

Once your order has been placed, we will send you a confirmation email. If you do not receive this, then please contact us at [email protected]. We will also e-mail you to notify you of any out-of-stock items and provide an invoice. Finally, to help you keep track of your order, we will send a despatch email as soon as your parcel is on its way. This will include your parcel tracking number.

If you do not receive your confirmation e-mail, please e-mail [email protected] or call +44 (0)1935 476255 and our team will look into it for you.

Unfortunately, mistakes happen and whilst they’re rare, we apologise. Please contact us at [email protected] or +44 (0)1935 476255 so that we can arrange for your goods to be returned. And of course, place a new order for you.

We take every care and attention to ensure our products reach you in perfect condition and are always extremely sorry to hear of any issues. But on the rare occasion that you receive a faulty item, please contact us on [email protected] or +44 (0)1935 476255, to arrange for the goods to be returned. We will either provide a replacement item or a full refund.


No, you can also checkout as a guest. After checkout, you will be given the option to create an account should you wish.

Your account information, including shipping addresses and contact details will be securely stored in your online profile. It will make future purchases and access to previous orders simpler and quicker.

Click on My Account and then log in using your username and password. You will be able to update your online profile for any future orders.

To reset your password please visit our Forgot Password page. You will automatically be sent a link to select a new password.

We take your privacy very seriously, which is why we have taken measures to ensure your personal details are always safe, and only ever used with your permission. For more on our Privacy Policy read here.


We accept all major debit and credit cards from customers around the world including VISA, Mastercard, Maestro and American Express, as well as Apple Pay, Google/Android Pay and PayPal.

Orders will be charged at checkout. Items will not be despatched until payment has been completed.

Yes. In recognition of the amazing work that the Armed Forces and Emergency Services do to keep us safe, we’re delighted to offer all personnel a 10% discount on any parts or services purchased, on presentation of the appropriate identity card. It’s our little way of saying a massive ‘thank you!’ Just contact us directly to place your order.


We use both TNT Express and TNT Economy Express courier services. As soon as your order is packed, weighed and ready to go, we will select the best option. Our priority is to always get your order to you as quickly, and as economically as possible.

Yes, we deliver to most markets globally. Please see our Delivery page for a summary of the countries we ship to.

Orders will be charged at checkout. Items will not be despatched until payment has been completed.

Delivery costs vary by weight, volume and shipment destination. The indicative charges provided during checkout are a best estimate. And whilst we will make every effort to ensure these are met, there are times when your order may incur additional charges. For example, if we need to pack it separately for extra protection during transit. In this instance, we will contact you with an updated delivery quote, prior to shipping.

Please see our Delivery page for indicative delivery charges by region.

We are committed to getting your order to you as quickly as possible, which is why we offer two delivery options. Typically, delivery to a UK address takes 1-2 days. International delivery ranges from 2-10 days.

We will send a despatch email as soon as your order is on its way. This will include a consignment number so that you can track the delivery status of your order at any time.

If you’re not around at the time of delivery, the courier will provide instructions on how to reschedule a delivery or arrange collection from a local depot.

Click & Collect

Yes, you can pre-order items for next-day collection, subject to availability, from our Yeovil facility at

12 Buckland Road
Penn Mill Trading Estate
BA21 5EA

We will e-mail you the same day, during normal office hours, to confirm when your order will be available for collection. We will notify you at that point if any items are out of stock.

The person whose card was charged must collect the order. Please bring both the payment card and one other form of identification i.e. driver’s license, passport.

We will hold your order for 4 weeks, from the date available for collection. If you wish to cancel your order during this time, then please e-mail [email protected] or call +44 (0)1935 476255.  If we do not hear from you, and your order is not collected within the 4 week timeframe, then you may be liable for a storage charge, and your order will no longer be available to collect.


We understand there are times you might change your mind. If so, you can return any unused items to us within 7 days of receipt for a full refund, subject to the following conditions:

  • Goods are returned in the condition/packaging they were sold in and are not damaged in anyway.
  • The goods were not specially ordered by Brise on the customers behalf.
  • The goods have not been fitted or tampered with.
  • All carriage costs are your expense.

If you have simply changed your mind, and wish to return an item, then in the first instance, please e-mail [email protected] or call +44 (0)1935 476255, and we will assist you. Of course, if the item is incorrect or faulty, then we will arrange for the goods to be returned at our expense.

You will receive an e-mail from us as soon as your refund has been processed. Refunds can take 1-3 days from receipt of goods, subject to us having the relevant information needed to perform the transaction. The length of time it will take to appear in your account can vary and will depend on your bank

Yes, all items must be returned in their original packaging, with no damage.

Unfortunately, mistakes happen and whilst they’re rare, we apologise. Please contact us at [email protected] or +44 (0)1935 476255 so that we can arrange for your goods to be returned. And of course, place a new order for you.

We take every care and attention to ensure our products reach you in perfect condition and are always extremely sorry to hear of any issues. But on the rare occasion that you receive a faulty item, please contact us on [email protected] or +44 (0)1935 476255, to arrange for the goods to be returned. We will either provide a replacement item or a full refund.

Technical - Alternators

Choose an output that is at least 10 per cent more than the maximum ampage demand. To calculate this, simply add together all of the power used by your electrical ancillaries. You cannot have ‘too much’ output, as the alternator is self-regulating, and therefore only ever gives as much as is needed.

Higher output units are generally heavier, as well as bigger in diameter, with the exception of ‘uprated’ types. If you need the higher output at very low engine speeds, there is no substitute for a bigger diameter and heavier alternator.

No – the output of all alternators increases with rotor speed/engine speed. A graph showing output against speed has a rapidly rising curve from ‘cut-in’ speed to ‘stabilised maximum’.

Standard specification alternators have a low ‘cut-in’ speed and reach their maximum output at a relatively low engine speed – about 3,000 RPM depending on pulley/drive ratio. Uprated alternators do not stabilise at this speed, but continue to rise in output to about 6,000 RPM.

The charging voltage depends on the number of amps being demanded by the vehicle’s electrical system. If the alternator is near to its maximum amperage output, the voltage is likely to be about 13.9v – 14.1v. A voltage of more than 15v could indicate a potential regulator failure. If the charging voltage drops below 12v, either the alternator has failed, or the amperage demand is too high for the alternator to supply at that engine speed.

No – an alternator self regulates by referencing the battery voltage and adjusting its charging voltage within set limits.  The voltage regulator will vary the field current that it supplies to the electromagnetic coil inside the rotor, therefore controlling the charging voltage.

Brise ‘S’ series uprated alternators are modified to achieve higher outputs in the smallest size and weight units. The internal components – stator, rectifier, regulator, brushes, bearings etc. – are hand built for motorsport applications to the highest quality. The output of a standard alternator can be doubled by doing this, however there will need to be strict heat management – uprated alternators create extra heat due to the higher electrical power produced. With uprated alternators it is also important to have the correct pulley/drive ratio. At low engine/rotor speeds the output may be lower than a standard alternator.

The maximum advisable rotor speed for Brise alternators is 18,000 RPM. Therefore, an engine with the maximum RPM of 9,000, a crankshaft pulley to alternator pulley ratio of 2:1 would be acceptable.

Running your alternator at slower speeds can give benefits in lower inertia and fan losses, but you must take into account the amperage output graph for all alternators.

Heat, vibration, and electrical ‘spikes’ are the main causes of failure. The twin internal fans that cool most Brise alternators, draw cooling air through both ends. The air then exits through the radial slots in the case. The most sensitive components are housed underneath the rear cover, therefore, it is important to ensure a good supply of cooling air in this location – especially in uprated ‘S’ type alternators. If piped cooling air is provided, it should not point directly at the outer radial slots as this would oppose the outgoing heated air.

Vibration issues are normally associated with inadequate mounting design. Mounts should be as solid as possible without any flexing. If anti-vibration bushes are used, they should be of a suitably hard material to avoid movement. Tensioning arms, again if used, should be designed to aid rigidity of the alternator. Avoid using ball joints, if possible, as they are only rigid in one plane.

Electrical transient spikes are caused by bad or intermittent connections – this can damage the voltage regulator’s electronics. Spikes may also occur if the engine is stopped with the battery master switch, rather than the ignition switch.

Choose a pulley that matches the crankshaft pulley width and belt design. Brise alternators can be supplied with either a single ‘V’ belt type in width measurements A or B on our technical drawings, or multi-v types in 3-8pk width. The diameter should be chosen to ensure that the maximum rotor speed of 18,000RPM is not exceeded. All Brise alternators are supplied with a steel pulley, as standard. Aluminium pulleys are available at an extra cost.

An alternator is a 3 phase AC generator with rectified DC output. The main components of an alternator are the stator winding (including the steel laminations), the rotor, rectifier, brush box, voltage regulator, body castings/brackets, and bearings.

Technical - Starter Motors

A pre-engaged starter motor fully engages the pinion gear with the ring gear, before using full power to crank the engine. This is achieved by the solenoid which, when energised, pushes the pinion gear into the ring gear. Only when the solenoid has reached its pre-determined position, will the electrical contacts that power the motor close. An inertia starter motor starts under full power as soon as it is energised. It uses the inertia of the heavy Bendix assembly to throw itself along the shaft helix and into engagement with the ring gear.

Pre-engaged starters are preferred due to their more reliable and softer engagement mechanism. It causes less damage to the ring gear and less chance of disengagement during cranking.

An inertia starter utilises a remote solenoid to switch the motor – this solenoid only has an electrical switch function. In the case of pre-engaged starters, there is a built-in solenoid that, not only switches the motor once it is engaged, but also mechanically moves the pinion gear into position. Changing from an inertia starter wiring system to a pre-engaged type, involves removing the remote solenoid and re-wiring the main battery and starter switch cables direct to the starter.

It is possible to leave the remote solenoid and its cables in place and use a link lead between the pre-engaged starters’ main battery connection and its solenoid switch connection. This will enable the starter to work, but it is not recommended as there would be two solenoids, with their accompanying voltage drops, doing the job of one.

An ‘Axial’ starter motor is a particular design that incorporates the solenoid at the back, and in line with the motor. The solenoid actuates directly through the centre of the motor shaft, thereby eliminating the need for levers and a separate housing (these are necessary with externally mounted solenoids). The axial design is more compact and suitable for applications where space and weight are at a premium. ‘AXG’ on the part numbers refers to ‘Axial with Gearbox’, this describes the axial type of starter that also has a planetary gearbox in its drivetrain. The planetary gearbox gives the starter a higher torque capability with a lower weight. The axial design also has interchangeable pinion gears on a splined shaft, as well as a removable mounting bracket that can be rotated to achieve the optimum position for the electrical connector block.

A PGR starter is a more conventional pre-engaged design that has an externally mounted solenoid.  A ‘PGR’ suffix on the part number, refers to permanent magnet gear reduction. This type of gear reduction system can be either planetary or spur gear type. Brise PGR starters have removable mounting plates that can be rotated, so the solenoid can be placed in the most suitable position to avoid clashes with other engine components or the chassis.

The power required to crank an engine to its required starting RPM, is determined by many factors, including the number of cylinders, compression ratio, and gear train efficiency. A starter motor does not have a synchronous speed. This is determined by the mechanical load placed upon it, therefore, the more powerful the starter, the faster it will crank the engine. A high torque starter with gear reduction will crank faster than a direct drive starter without gear reduction, due to the increased torque available.  Gear reduction will be in the ratio of 6:1, for every six turns the armature makes, the pinion gear does one, allowing for operation at the motor’s most efficient speed.

The cranking speed is determined by the mechanical load placed on the starter motor, and by the ratio of the pinion gear to the flywheel ring gear. Small diameter clutches and flywheels will increase the torque requirement and may result in a slower cranking speed. The battery voltage applied is critical to the starter speed.

A starter motor’s power is proportional to the applied voltage, therefore, it is crucial to the starter motor’s performance. Whilst cranking, hundreds of amps may be drawn from the battery. Its ability to maintain a good voltage is determined by its CCA (cold cranking amps) rating. You can expect to see the measured battery voltage drop as low as 9V during cranking.

A high torque starter with gear reduction will crank faster than a direct drive starter (no gear reduction) due to the increased torque available. Gear reduction will be in the ratio 6:1, this means that the armature inside the starter is able to turn six times for each revolution of the pinion gear.

Starter motor pinion gears may vary by their diameter and number of teeth. Gear types are classified in either DP (diametrical pitch) or module. DP is an imperial measurement, whereas module is a metric measurement. Typical pitches for automotive uses are DP10 (equivalent to module 2.54) and DP12 (equivalent to module 2.116).

The module measurement can be determined by dividing the pitch circle diameter of the gear, by the number of teeth. Note: the pitch circle diameter is not the same as the overall diameter, it is approximately halfway down the tooth depth. It is essential that the gear pitches, of both the pinion gear and flywheel ring gear, are identical to avoid meshing problems. Incompatible gears will easily cause damage, noise and cranking power loss.

It could be either mechanical or electrical. If the pinion gear is not located at the recommended distance from the ring gear when it is at rest, then the pre-engagement mechanism may not operate correctly, causing the pinion gear to ‘stall’ against the ring gear face. If the gears are not compatible, or the gear backlash is incorrect, i.e. too tightly engaged, then the gear may not be able to find a tooth gap in which to insert itself.

If all mechanical mounting requirements are correct, then the problem could be electrical. The solenoid requires a certain minimum voltage to operate correctly. If repeated clicks are heard, it could be caused by a collapse in battery voltage when the starter operates. Check the voltage applied at the solenoid terminal – it should be no lower than 9.6v when the starter is energised.  The solenoid can also be affected by excess heat, so check to see if the problem persists when the unit is cold. And finally, check that the solenoid energising wire is of adequate size for the solenoid amps draw required. If it is too small an excessive volt drop will occur.

You should avoid continuous cranking of more than ten seconds. After a long cranking duration, a delay of at least three minutes should be allowed for motor temperatures to stabilise. Overheating can cause damage to the armature brushes and the commutator.

The voltage during cranking depends on several things; the mechanical load applied, amps drawn, and CCA rating of the battery. If the voltage drops below 9.6v the starter may not operate correctly.

When cranking at a normal speed, the amp draw should be around 300A. If the starter is locked in the stall position with power applied, the amps draw may go up to 600A.

A graph of the starter motor performance is available from Brise on request.

Technical - Fuel Pumps

The HPFP will have part number 13 51 7 642 466 or 0 261 520 257 stamped on the side of the pump.  If your vehicle doesn’t have this number stamped on the side but your vehicle is listed above then please contact us for support.

Fitment is extremely easy by removal of 2 high pressure fuel pipes, 2 retaining bolts and 1 electrical plug – maximum 30 minutes.  However, due to the high pressures generated during operation and cleanliness requirements we would always recommend that this work is carried out by an experienced technician/workshop who has experience working with high pressure fuel systems.

Taking a M140i for example, the standard fuel system runs at a maximum pressure of 200bar @ 340bhp.  A stage 1 tune using a reputable tuning solution/company will typically increase the power output to 420bhp without any additional modifications and this is typically achieved by an increase in boost pressure, fuel pressure, injection duration and optimisation of injection timing by recalibration of the ECU, known as an ECU remap.  However, beyond this power level it is recommended to upgrade the HPFP to ensure the fuel system can keep up with the fuel requirement since there has been cases of the standard high pressure fuel pump being unable to maintain flow/pressure to the injectors and the result is lean combustion which can result in engine failure/damage.

No, the ECU will require recalibration to take full advantage of the increased flow/pressure available from the high performance HPFP.  However, it is possible to fit the uprated HPFP without any other modifications and the vehicle will still operate and drive as normal.

No, the high performance HPFP is modified at the factory to fit the standard wiring loom and no extensions or conversion looms are required.

We offer a 12-month warranty from date of sale; however the warranty is strictly limited to the HPFP and we cannot accept any liability for incorrect fitment and/or damage to vehicle/engine.  We recommend that an experienced technician/workshop installs the HPFP to ensure cleanliness standards are maintained which are required for common rail high pressure injection systems.

Yes, we can fit this part to your vehicle in our Birmingham or Coventry branch.  Please contact us for more information before placing an order to discuss availability and pricing.