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The brake booster facilitates braking


Modern vehicles have a brake booster, which, as the name suggests, amplifies the force from the brake pedal and passes it on to the master cylinder. This makes braking easier, as the driver does not have to step on the brake pedal excessively. In older vehicles, where the brake booster did not yet exist, braking had to be done with pure muscle power. This could be critical, especially if the brakes had to be applied abruptly and hard. Thanks to the brake booster, it is now much easier to bring the car to a stop in time, even in dangerous situations. In the lower part of the page we present the two brake boosters commonly used today and give instructions on how to tell if it is defective. In addition, you will find a few tips to keep in mind when buying a brake booster.

What types of brake boosters are there and how do you recognize a defect?
What to consider when buying a brake booster?

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BOSCH Druckspeicher Bremsdruckspeicher 0265202070 für MERCEDES E-KLASSE W211

Item No.: UNI513W420
Manufacturer: BOSCH
part number: 0 265 202 070
EAN-Code: 4047024899735
Baugruppe: Bremsanlage
Verwendung: Bremsdruck
Mengeneinheit: Stück
83,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

TRW Bremskraftverstärker PSA526 für CHEVROLET OPEL ASTRA G ZAFIRA A TOYOTA

>> für Fahrzeuge ohne ESP, ohne Bremsassistent <<

Item No.: A16513W790
Manufacturer: TRW
part number: PSA526
EAN-Code: 3322937230327
Baugruppe: Bremsanlage
Durchmesser_zoll: 10
Verwendung: Bremskraftverstärker
Mengeneinheit: Stück
Herstellereinschraenkung: TRW
112,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

TRW Bremskraftverstärker PSA510 für LAND ROVER DEFENDER (LD) Ø 10 Zoll

>> für Fahrzeuge ohne ABS, ohne Bremsassistent <<

Item No.: UNI123W949
Manufacturer: TRW
part number: PSA510
EAN-Code: 3322937061495
Baugruppe: Bremsanlage
Durchmesser_zoll: 10
Verwendung: Bremskraftverstärker
Mengeneinheit: Stück
Herstellereinschraenkung: TRW
125,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

TRW Bremskraftverstärker PSA908 für BMW 5ER E39 u. 7ER E38 ab BJ 10.1997

entspricht BMW OE-Nummer: 34 33 1 165 541

Item No.: A02513W696
Manufacturer: TRW
part number: PSA 908
EAN-Code: 3322937240210
Baugruppe: Bremsanlage
Verwendung: Bremskraftverstärker
Mengeneinheit: Stück
Herstellereinschraenkung: TRW
187,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

TRW Bremskraftverstärker PSA922 für AUDI A4 (8E B6 B7) S4 quattro VW PASSAT (3B)

entspricht VAG OE: 3B0612107 / 3B0612107B / 3B0612107A

Item No.: A18513W806
Manufacturer: TRW
part number: PSA922
EAN-Code: 3322937396061
Baugruppe: Bremsanlage
Durchmesser_zoll: 9
Verwendung: Bremskraftverstärker
Mengeneinheit: Stück
Herstellereinschraenkung: TRW
105,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

BOSCH 0986482036 Bremskraftregler VW TRANSPORTER T4 Bus Kasten Pritsche 7D0612503

Baujahr beachten! | für hydraulisches Bremssystem!

Item No.: UNI413W514
Manufacturer: BOSCH
part number: 0 986 482 036
EAN-Code: 4047025305129
Baugruppe: Bremsanlage
Lastabhaengig:
Bremssystem: Hydraulisch
Verwendung: Bremskraftregler
Mengeneinheit: Stück
66,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

TRW PSA743 Bremskraftverstärker für AUDI A4 B6 B7 A6 C5 SEAT SKODA VW PASSAT 3B

für Fahrzeuge ohne Bremsassistent

Item No.: A18513W805
Manufacturer: TRW
part number: PSA743
EAN-Code: 3322937285310
Baugruppe: Bremsanlage
Durchmesser_zoll: 8 / 9
Verwendung: Bremskraftverstärker
Mengeneinheit: Stück
Herstellereinschraenkung: TRW
97,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

TRW PSA406 Bremskraftverstärker PORSCHE 993 3.6/3.8 Carrera 99335502310

für Fahrzeuge ohne Bremsassistent

Item No.: A09513W812
Manufacturer: TRW
part number: PSA 406
EAN-Code: 3322937061419
Baugruppe: Bremsanlage
Durchmesser_zoll: 9
Verwendung: Bremskraftverstärker
Mengeneinheit: Stück
Herstellereinschraenkung: TRW
163,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

TRW PSA521 Bremskraftverstärker PORSCHE 996 Boxster Cayman (986 987) 99635592300

für Fahrzeuge ohne Bremsassistent

Item No.: A09513W818
Manufacturer: TRW
part number: PSA521
EAN-Code: 3322937184743
Baugruppe: Bremsanlage
Durchmesser_zoll: 10
Verwendung: Bremskraftverstärker
Mengeneinheit: Stück
Herstellereinschraenkung: TRW
175,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

TRW PSA143 Bremskraftverstärker MINI R55/56/57/58/59/60/61 One Cooper JCW 34336863541

Item No.: UNI531W314
Manufacturer: TRW
part number: PSA143
EAN-Code: 3322938020378
97,14 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

ATE 03786007024 Bremskraftverstärker BMW 3 E46 316-330 318d-330d E85 2.0-3.0 34336779682

Einschränkungen beachten!

Item No.: UNI531W215
Manufacturer: ATE
part number: 03.7860-0702.4
EAN-Code: 4006633082648
Baugruppe: Bremsanlage
Kenngroesse: T52/4
Durchmesser_zoll: 10
Bremssystem: ATE
Verwendung: Bremskraftverstärker
Mengeneinheit: Stück
Betriebsart: pneumatisch
155,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart
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What types of brake boosters are there and how do you recognize a defect?

Two types of brake boosters are common today:

  • Vacuum brake booster
  • Hydraulic brake booster

The vacuum brake booster uses negative pressure to distribute braking force, which is generated by the intake tract in the engine or by a vacuum pump. In contrast, the hydraulic brake booster uses a hydraulic pump that is driven by the engine.

Brake boosters only work when the engine is running. If the engine is switched off and you are being towed, for example, pure muscle power is again required for braking.

Due to age-related wear, a brake booster can become leaky and thus no longer function correctly. This is especially noticeable when the brake pedal is more sluggish and braking thus becomes more difficult. To test whether the brake booster is defective, there is a simple way to find out:

With the engine switched off, depress the brake pedal several times in succession until it becomes sluggish. The existing vacuum is then used up. Now start the engine with the brake pedal depressed. The brake pedal should give way if the brake booster is OK. If it does not, it must be replaced. Likewise, there is a defect if the pedal wants to come up by itself after a short time without you reducing the brake force. Then the diaphragm of the brake booster is leaking and it must be replaced.

However, the symptoms of a sluggish brake can also be due to a defective vacuum pump or a broken vacuum line. Therefore, before replacement, first check which part is actually defective, as this will be reflected in the amount of work required and the cost of materials.
To replace a brake booster, it is generally also necessary to remove the brake pedal, brake lines, master cylinder and vacuum lines. Thus, the brake fluid can also be changed in the same context.

What to consider when buying a brake booster?

If you want to buy a brake booster, you should use high-quality branded products. This is the only way to ensure a high accuracy of fit, as these products meet the requirements of the vehicle manufacturer. Likewise, branded items have a long service life, so they do not need to be replaced again for a long time. Leading suppliers of brake boosters include:

From these two manufacturers you will find suitable offers in our store. To do this, it is best to select your vehicle. Then you will be shown the corresponding products. In addition, you will also find brake force regulator in this category. The brake force regulator is a control valve that ensures that the rear wheels do not lock during braking and the vehicle is thus kept stable in the track. It is usually mounted directly on the master brake cylinder.

If you need help picking out the right brake booster and brake force regulator, feel free to contact our customer service with the 17-digit VIN number.