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Car brake fluid guide: check, how often change and cost

Table of content

  1. How often and why does the brake fluid need to be changed?
  2. What happens if the brake fluid is too low?
  3. How do you notice that brake fluid is missing?
  4. Can you change the brake fluid yourself?
  5. Can you top it up yourself?

Very few drivers bother to change the brake fluid. In principle, they don't have to, because it is checked and regularly changed as part of regular maintenance. Nevertheless, it never hurts to take a look at the brake fluid reservoir in the engine compartment, because a leak in the line can also cause a gradual loss of fluid.

Drivers who do not regularly visit the workshop for service – often drivers who do not drive very often or owners of older vehicles – should pay particular attention: the brake fluid must be changed every two years at the latest.

-56%
ATE DOT 4 03.9901-6202.2 Brake Fluid 1l
Parts Details
  • Quality: TYP 200
  • DOT specification: DOT 4
  • Capacity [litre]: 1
  • Packing Type: Can
  • MAPP code available
  • ATE: Brake Fluid
  • Item number: 03.9901-6202.2
  • Our price: £ 15,44
  • Condition: New
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ATE Brake Fluid 1l
Article number: 03.9901-6202.2
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RRP

£ 35,48
£ 15,44
£ 15,44 for 1 litre
price incl. 20% VAT, excl. delivery costs
-12%
A.B.S. DOT 4 7522 Brake Fluid 0,25l
Parts Details
  • DOT specification: DOT 4
  • Capacity [litre]: 0,25
  • Weight [g]: 256
  • Weight [kg]: 1,18
  • A.B.S.: Brake Fluid
  • Item number: 7522
  • Our price: £ 3,93
  • Condition: New
Details
A.B.S. Brake Fluid 0,25l
Article number: 7522
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RRP

£ 4,51
£ 3,93
£ 15,72 for 1 litre
price incl. 20% VAT, excl. delivery costs
ATE DOT 4 03.9901-5832.2 Brake Fluid 1l
Parts Details
  • Specification: SL DOT 4
  • DOT specification: DOT 4
  • Capacity [litre]: 1
  • Packing Type: Can
  • MAPP code available
  • Language Version: Bulgarian, Czech, Croatian, Hungarian, Georgian, Polish, Romanian, Russian, Slovak, Slovenian, Arabic
  • ATE: Brake Fluid
  • Item number: 03.9901-5832.2
  • Our price: £ 9,21
  • Condition: New
Details
ATE Brake Fluid 1l
Article number: 03.9901-5832.2
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£ 9,21
£ 9,21 for 1 litre
price incl. 20% VAT, excl. delivery costs
K2 DOT 4 T104 Brake Fluid 0,5l
Parts Details
  • Specification: FMVSS 116 DOT 4, SAE J 1703
  • DOT specification: DOT 4
  • Capacity [litre]: 0,5
  • K2: Brake Fluid
  • Item number: T104
  • Our price: £ 4,07
Details
K2 Brake Fluid 0,5l
Article number: T104
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£ 4,07
£ 8,14 for 1 litre
price incl. 20% VAT, excl. delivery costs
VALEO DOT 4 402403 Brake Fluid 1l
Parts Details
  • Specification: DOT4
  • DOT specification: DOT 4
  • Capacity [litre]: 1
  • Chemical Properties: Synthetic
  • Dry Boiling Point [°C]: 245
  • Packing Type: Bottle
  • Weight [kg]: 1,15
  • VALEO: Brake Fluid
  • Item number: 402403
  • Our price: £ 7,76
  • Condition: New
Details
VALEO Brake Fluid 1l
Article number: 402403
£ 7,76
£ 7,76 for 1 litre
price incl. 20% VAT, excl. delivery costs

How often and why does the brake fluid need to be changed?

Regardless of the mileage, the brake fluid should be changed at regular intervals. Porous brake hoses can cause it to absorb water. Therefore it is necessary have proper and clean brake fluid for car to bind moisture that could affect your brakes.

This is a problem because the brake system and fluid can get very hot. So hot that the accumulated water boils and steam bubbles form. In extreme cases, no more brake pressure can be exerted and the brake fails.

What happens if the brake fluid is too low?

This can also lead to brake failure. The expansion tank in the engine compartment shows whether there is enough standard or brake fluid for BMW. The system holds a total of about two litres.

When should brake fluid be changed

How do you notice that brake fluid is missing?

If the red warning light in the dashboard with the brake symbol (red exclamation mark in a circle) lights up, caution is advised. It indicates either that the handbrake is still applied or that there is a problem with the brake because the brake fluid has dropped or the pads are worn. As the brake system is a safety-relevant component, you should stop driving, follow the instructions in the operating manual and call a breakdown service. There are also other indications that your car is lacking brake fluid. If the braking effect decreases, delays in reacting or the brake pedal can be pressed down without much resistance, then you should be suspicious and not continue driving.

CASTROL DOT 4 15CD1A Brake Fluid 1l
Parts Details
  • Specification: ISO 4925 Class 4, FMVSS 116 DOT 4, JASO JIS K2233, SAE J1703, SAE J1704
  • DOT specification: DOT 4
  • Capacity [litre]: 1
  • Chemical Properties: Free of nitrite
  • Weight [kg]: 1
  • Packing Type: Bottle
  • CASTROL: Brake Fluid
  • Item number: 15CD1A
  • Our price: £ 11,83
  • Condition: New
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CASTROL Brake Fluid 1l
Article number: 15CD1A
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£ 11,83
£ 11,83 for 1 litre
price incl. 20% VAT, excl. delivery costs
VALEO DOT 4 402402 Brake Fluid 0,5l
Parts Details
  • Specification: DOT4
  • DOT specification: DOT 4
  • Capacity [litre]: 0,5
  • Chemical Properties: Synthetic
  • Dry Boiling Point [°C]: 245
  • Packing Type: Bottle
  • Weight [kg]: 0,59
  • VALEO: Brake Fluid
  • Item number: 402402
  • Our price: £ 4,55
  • Condition: New
Details
VALEO Brake Fluid 0,5l
Article number: 402402
£ 4,55
£ 9,10 for 1 litre
price incl. 20% VAT, excl. delivery costs
TEXTAR DOT 4 95002200 Brake Fluid 1l
Parts Details
  • Specification: DOT4, ISO 4925 (Class 4), SAE J 1704, FMVSS 116 DOT 4
  • DOT specification: DOT 4
  • Capacity [litre]: 1
  • Dry Boiling Point [°C]: 260
  • Wet Boiling Point [°C]: 160
  • Packing Type: Bottle
  • Quantity Unit: Litre
  • Recommendations: Ford M6C9103A, Mazda MN 120 C, Nissan M5055 NR3, Nissan M5055 NR4, Renault 41.02.001(3), Renault 41.02.001(4), Toyota TSK 2602 G(3), Toyota TSK 2602 G(4)
  • Packaging length [cm]: 9,5
  • Packaging width [cm]: 7
  • Packaging height [cm]: 24,5
  • Technical Information Number: 98502 0022 9 L
  • TEXTAR: Brake Fluid
  • Item number: 95002200
  • Our price: £ 7,69
  • Condition: New
Details
TEXTAR Brake Fluid 1l
Article number: 95002200
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£ 7,69
£ 7,69 for 1 litre
price incl. 20% VAT, excl. delivery costs
-27%
FEBI BILSTEIN DOT 4 26746 Brake Fluid 0,25l, Capacity: 250ml
Parts Details
  • Capacity [ml]: 250
  • Specification: DOT 4
  • DOT specification: DOT 4
  • Capacity [litre]: 0,25
  • Weight [kg]: 0,301
  • Observe service information
  • Required quantity: 1
  • FEBI BILSTEIN: Brake Fluid
  • Item number: 26746
  • Our price: £ 2,98
  • Condition: New
Details
FEBI BILSTEIN Brake Fluid 0,25l, Capacity: 250ml
Article number: 26746
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£ 4,10
£ 2,98
£ 11,92 for 1 litre
price incl. 20% VAT, excl. delivery costs
-48%
A.B.S. DOT 4 7502 Brake Fluid 5l
Parts Details
  • DOT specification: DOT 4
  • Capacity [litre]: 5
  • Weight [g]: 5300
  • Weight [kg]: 5,3
  • A.B.S.: Brake Fluid
  • Item number: 7502
  • Our price: £ 28,63
  • Condition: New
Details
A.B.S. Brake Fluid 5l
Article number: 7502
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£ 55,93
£ 28,63
£ 5,73 for 1 litre
price incl. 20% VAT, excl. delivery costs

Can you change the brake fluid yourself?

This is generally not advisable, after all it is your safety that is at stake – only an expert with the appropriate knowledge and special tools should do this.

Can you top it up yourself?

In theory, yes, but we advise a trip to the workshop: Sometimes it is necessary to bleed the car brake system components after filling up. A specialist also knows which one is right for your vehicle. You can expect to pay around £54 to have it done for you at a garage in the UK.

You should always be careful when handling brake fluid. It is harmful to health and can irritate your skin and eyes. It is best to remove any spilled fluid in the engine compartment immediately, as it is corrosive. And do not use bottles of brake fluid that have already been opened, as water may have accumulated in them.

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MOTUL DOT 4 101666 Brake Fluid 0,5l
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  • DOT specification: DOT 4
  • Capacity [litre]: 0,5
  • Oil: Full Synthetic Oil
  • Recommendations: FMVSS 116 DOT 4, SAE J1703
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  • MOTUL: Brake Fluid
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  • MOTUL: Brake Fluid
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A.B.S. DOT 4 7516 Brake Fluid 1l
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CASTROL DOT 4 15CD21 Brake Fluid 1l
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MANNOL DOT-5.1 MN3005-05 Brake Fluid Capacity: 500ml
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Valvoline HIGH PERFORMANCE DOT 5.1 883462 Brake Fluid 1l
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