Bosch Automotive Aftermarket in the United Kingdom

Tips & Technology

The lastest tips and technology updates direct to your workshop

Up-to-date information for the successful workshop: General know-how on diagnosis, product features, installation instructions and more.

Explore the latest topics

Up-to-date information for a successul workshop

Wiper blades
No. 03/2020

Clear view: Tips and tricks

Wiper blades

Tips and tricks concerning the maintenance of Bosch wiper blades

Bosch wiper blades are high-quality products. Installed on vehicles, a clear view is ensured at all times. Our tips and tricks will reveal how you can make sure that your Bosch wiper blades provide excellent wiping results for a long time.

Wiper blades
How to achieve outstanding wiping results

  • Regularly clean the windshield and the wiper rubbers!
  • Top up the windshield washer tank!
  • Replace wiper blades regularly!
  • Remove leafs and coarse dirt!
  • Prepare the wiper blades for the winter season!

Brake pads
No. 05/2019

Service and repair tips

Brake pads

Service and repair tips: Brake pads

As a strong partner with extensive expertise in brakes, we offer your workshop everything you need for the ef cient maintenance and repair of brake systems: rst-class products, reliable service offerings and ef cient diagnostic technology.

Identifying and solving the most common problems with brake pads:

There are many causes of vibration and noise during braking. These are not always the result of worn brake pads. You should therefore always check the brake pads regularly to better identify the actual causes of braking problems.

Brake pads
Count on Bosch

  • High market coverage: over 95%
  • Matching solutions for all current vehicles
  • Comprehensive OEM expertise
  • Precise t and easy assembly
  • Reliable and fast delivery service

Brake discs
No. 05/2019

Service and repair tips

Brake discs

Service and repair tips: Brake discs

As a strong partner with extensive expertise in brakes, we offer your workshop everything you need for the ef cient maintenance and repair of brake systems: rst-class products, reliable service offerings and ef cient diagnostic technology.

Brake discs
Count on Bosch:

  • High market coverage: over 95%
  • Matching solutions for all current vehicles
  • Comprehensive OEM expertise
  • Precise t and easy assembly
  • Reliable and fast delivery service

No. 09/2018

ESI[tronic] 2.0 Online Info type EBR

Experience-based repair

ESI[tronic] 2.0 Online Info type EBR

When ESI[tronic] 2.0 Online Info type EBR identifies a known error during diagnosis, it will automatically recommend a repair solution, already validated as a good remedy by other users.

ESI[tronic] 2.0 Online Info type EBR gives you a database of over 700,00 real-life recommendations and it’s growing every day!

What does experience-based repair (EBR) involve?

EBR describes a complaint that has occurred in practice on a vehicle or a component of the vehicle. EBR explains a known cause for the complaint and offers a clear recommendation for action. Each individual EBR relates to exactly one cause, and one cause may well give rise to various complaints.

EBR offers structured and targeted user guidance. These are always based on the latest technological findings. The respective repair context consists of fault diagnoses, real experiences and solutions from other users.

No. 06/2018

Auxiliary Drive

Alternator Overrunners from Bosch

Alternator Overrunners from Bosch


  • OAP (Overrunning Alternator Pulley)
  • OAD (Overrunning Alternator Decoupler)

Both OAPs and OADs have a simple overrunning clutch.

OADs also have a torsion spring to absorb energy. This enables rotational irregularities in the crankshaft to be evened out better.


While the engine is running, a faulty alternator overrunner can be identified by the rough running characteristics of the pulley and any associated noise. It can also result in the vehicle battery not being charged due to the pulley being able to spin in both directions. OAPs and OADs always rotate freely in one direction. OAPs will immediately lock in the opposite direction, and OADs rapidly build up resistance to turning in the opposite direction until they lock. If any of the failure symptoms mentioned above are present, the alternator overrunner must be replaced.

A correctly functioning overrunner can be identified by smooth operation and the alternator coming to a delayed standstill after the engine is switched off.

Resulting damage

If the alternator overrunner becomes jammed, the engine’s rotational vibrations cannot be evened out. At low engine speeds, these vibrations cause the belt to run roughly and the tensioning components are subjected to higher than normal loads. Not only does this increase belt wear but other components in the auxiliary drive (e.g. tensioning and deflection rollers, torsion vibration dampers) may also fail prematurely.

Subject to the application, the overrunner can either be replaced in the vehicle or with the alternator removed and placed on a firm support (e.g. workbench).

Alternator Fitting

  • Depending on the rotational direction of the alternator, the overrunner has either a left- or right-hand thread.
  • Insert a suitable fitting tool (1) into the overrunner’s serration (2), and use an appropriate insert/socket (3) to hold the rotor shaft in place.
  • Use a ring spanner (4) to loosen or tighten the overrunner. Tightening torque: 80 Nm.
  • If the alternator overrunner is designed for use with a cover cap, fit the new cover cap supplied.


When removing or fitting the alternator overrunner, never lock the alternator fan as this can result in damage to the fan.


If the alternator overrunner has failed, tensioning and deflection rollers may also be damaged. They must also be checked for correct function and replaced if necessary.

High-pressure injection valves
No. 04/2018

Great to work with: High-pressure injection valves

Treating high-pressure injection valves properly enables them to be repaired effectively

Repair of high-pressure injection system components

Bosch supplies spare parts and special tools for the repair of the high pressure injection systems. ESI[tronic] 2.0 gives a complete diagnostic sequence to be followed with installation instructions including measurement values, fault patterns and even signal images. With this sort of help from Bosch’s detailed instruction manual, spare parts and special tools, it is a relatively easy task to remove or replace high-pressure injection valves and combustion chamber seals.

Removal and installation of high-pressure injection valve (HPIV)

  • Read ESI[tronic] 2.0 instructions carefully
  • Use appropriate tools to remove HPIV and replace the combustion chamber seal
  • Avoid damage to the valve tip (valve leakage)
  • Prevent the ingress of foreign bodies and dirt during installation
  • If the HPIV is to be reused, never use impact tools during the installation of the HPIV into the cylinder head
  • Do not apply oil or grease to the white Teflon seal
  • Apply a thin coat of clean, silicone-free engine oil to the blue seal before installing the fuel rail
  • When removing and reusing the HPIV, always replace the specified spare parts (service kits)

Important Notices

  • The engine must be cold during the repair work
  • The Fuel high-pressure system must be depressurised when working on it
  • Never disconnect fuel lines while the engine is running

‘Step by step’ removal and installation instructions for HPIV and HPP can be found on the Internet

Bosch installation instructions - Gasoline high-pressure injector (Video)

Bosch installation instructions - High-pressure injection pump (Video)

High-pressure injection valves

Special tools

  • Set 0 986 616 097 with assembly drift and adjustment ring for installation of the combustion chamber seal
  • For the removal of a high-pressure injection valve:
    • Spindle extractor 0 986 616 100
    • Impact extractor 0 986 616 101 (only use when valves are seized)

Spare parts

  • O-ring for high-pressure injection valve (HPIV)
  • Combustion chamber seal (Teflon ring)
  • Support shim
  • Hold-down tool

Bosch air filters
No. 03/2018

Bosch air filters

Explore product characteristics and customer benefits

Terminus for particles of dirt of all kinds

The tasks of an air filter are to protect the motor from particles of dirt in the entrained air, to protect the motor from abrasive wear and to assure the supply of air for air/fuel mixture preparation.

Regularly change the air filter according to the vehicle manufacturer’s instructions!

Consequences of a clogged filter:

  • Reduced air intake, leading to decreased engine output and increased pollutant emission
  • Higher fuel consumption
  • Problems when starting the engine
  • Premature oil contamination

Quality is worth paying for. Find a comparison of Bosch air filters here:

Bosch air filtres
Sales arguments at a glance

Customer benefits:

  • Long service life, high particle collection rate, wet strength, and high tensile strength
  • High level of dirt absorption capacity and low flow rate resistance
  • Stable pleat geometry
  • Perfect fit

Product characteristics:

  • Multi-layer, specially impregnated filter medium
  • Large filter surface area
  • Specialist impregnation of the filter medium
  • Precisely adapted shape and high-quality gasket material

Bosch Aerotwin
No. 02/2018

Aerotwin passenger car flat-blade wipers

Bosch Aerotwin: leading technology in the field of flat-blade wipers

Bosch Aerotwin

Development and innovation

Maximum comfort, trailblazing design

All components are developed based on specific vehicles, and cutting-edge tools are used to fine-tune the wiper system.

Bosch uses the wind tunnel to perform tests under various wind conditions and speeds up to 160 km/h, for instance.

Large-scale manufacturing

Special, multi-award-winning Bosch rubber mixture

Consistently high rubber mixture production quality thanks to sophisticated lab analyses prior to production approval.

The wiper rubber is durable due to its high resistance to abrasion, UV light and aging as well as high cold and heat elasticity.

Performance and stress testing

Safety and reliability are the foremost principles

Strict performance and stress tests carried out in the testing laboratory as well as directly on the vehicle are the basis for the consistently high quality of Bosch windscreen wipers.

Subject to testing are, among others, resistance to environmental and ozone impacts, chemical stress and abrasion.

Performance tests assess wiping quality, noise generation, high-speed performance and service life to ensure long-lasting wiping quality.

Bosch Aerotwin
Wiper rubber with Power Protection Plus

The aerodynamic design and patent Power Protection Plus wiper rubber ensure optimum visibility in any weather conditions.

Find all benefits at a glance here >

Cabin filter range
No. 01/2018

Cabin filters

Quality testing of the FILTER+ cabin filter

FILTER+ cabin filter

Quality testing: Filtration efficiency

An important quality criterion for a cabin filter’s performance is its filtration efficiency or its capacity to filter out particles. Bosch had its FILTER+ and a similar OE filter tested by the independent institute Flatech GmbH, Germany. Measurements were made in accordance with ISO 11155-1.

Test results*

Particulate matter test:
Bosch’s FILTER+ offers highly efficient protection against respirable particulate matter (particle size < 2.5 μm), surpassing even a similar OE filter.

Pollen test (ragweed and birch):
Bosch’s FILTER+ provides the same high degree of efficient protection against allergens as a similar OE filter.

*find graphs and more information in full article below

Cabin filter range
Workshop Tip

Bosch recommends that you change the cabin filter once a year or every 15,000 km.

Consequences of a clogged filter:

  • Reduced vision from fogged windows, resulting in reduced safety
  • Increased pollutant concentration inside the vehicle
  • Allergic reactions, e.g. sneezing
  • Reduced cooling capacity of the air-conditioning system resulting from deposits on the evaporator

SMT-300 Smoke machine tester
No. 11/2017

General information on diagnosis

Leakfinder for diagnosing leaks in closed systems

Leakfinder for diagnosing leaks in closed systems

The size of a leak and its location can be determined in two steps:

  • The device with the optional accessories is suitable for investigating leaks in fuel and exhaust systems.
  • The smoke that is generated can also be used to search for leaks in door and window seals.

When investigating leaks in a fuel system, only inert gas (non-combustible, CO2, or nitrogen) may be used. An “inert gas pack kit” (pressurised gas bottle and adaptor) can be ordered separately. The pressurised gas bottle is supplied empty and must be filled by a specialist supplier of inert gases.

You can also order a nitrogen regulator, which is preset to 7 bar, for use with larger nitrogen bottles in the workshop.

A cylinder hose, which can also be ordered separately, is required for connection to the SMT-300.

SMT-300 Smoke machine tester

  • The leak diagnostic device is suitable for tests on fuel vapour return systems as well as other applications.
  • You can test closed circuits, such as intake and exhaust systems, as well as find leaks that let in wind and water.
  • By using the integrated test mode, you can check closed systems without smoke initially and then introduce smoke as needed. You can also regulate the amount of smoke, which makes it easier to find small leaks.
  • This device can be used to ensure that the vehicle system is functioning properly and to prevent any damage.