contaminated with water) compared to when it is ‘dry’ (i.e. The table below shows how the boiling point of DOT 4 ESP Brake Fluid can be severely reduced when it is ‘wet’ (i.e. Changing brake fluid when recommended prevents brake failure and maintains the boiling point at a safe level. The general brake fluid flush cost range is from 50 to 130. In some cases, a vehicle with a large reservoir such as some ¾ ton trucks costs a little more as it takes more fluid. Whilst regular servicing of your vehicle will include checking the boiling point of your brake fluid, vehicle manufacturers recommend that you change your brake fluid at least every two years if not sooner (check your vehicle handbook for details). How much to change brake fluid is pretty straightforward and is usually a set price, regardless of the vehicle. The boiling point can be significantly reduced by water contamination which will have a negative effect on your braking ability. As the water content in the brake fluid increases, the temperature the liquid boils at decreases. The process flushes all these things out and restores to a nice firm peddle. You also get air bubbles in the line/calipers. Because it is hydroscopic (absorbs water) it will corrode components and lower the boiling point leading to spongy brakes. You will also receive a free comprehensive brake check when you book your brake fluid change online which includes an inspection of your key brake components to ensure they are working effectively.īrake fluid has hygroscopic properties - meaning that it absorbs moisture during its life in your car through the pipes, hoses and joints that it lubricates. Brake fluid requires changing based on time, not mileage. At Kwik Fit, we use a high specification DOT4+ fluid that has been designed to meet the demands of modern electronic stability control systems. On most modern vehicle the use of a diagnostic tool is also required, to enable a bleed function on the ABS controller, to ensure that all the old fluid is purged from the different pathways and valves within the ABS pump. The new fluid pushes out the old fluid, which is then disposed of. As the water content increases, the boiling point of the brake fluid becomes lower. What Happens if You Dont Change the Brake Fluid As we said, if you dont change the brake fluid, moisture absorbed by the fluid builds up throughout the hydraulic braking system. Starting with the brake in most need of attention (the most contaminated) and then moving around the vehicle in a sequence depending on the braking system fitted, the old fluid is then bled out at the bleed nipple on each brake, until clean fluid is seen in the bleed bottle. That is why old brake fluid is known in the auto repair trade as the silent killer. Our trained brake technicians will use a pressure bleeder to perform the brake fluid change – this pumps a constant supply of new fluid under pressure into the brake fluid reservoir to avoid air getting into the hydraulic system. What is included in a brake fluid change?
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