Brakes are essential for any car and this makes brake fluid one of your car's most important components. Brake fluids resist the moisture that can cause vapour lock brake failure, protect against corrosion, and withstand high brake temperatures. Every so often you need to change brake fluid in line with your car manufacturer’s manual. You may also need a second person to help you.
There are 6 steps in our how to replace brake fluid guide. This quick guide is intended to help you to understand the process. Changing brake fluid isn’t a do-it-yourself task except for the very proficient as it requires some professional training and modern braking systems work at extremely high pressures. You should check your car manufacturer’s manual to see if any repairs to the braking system are legally permitted other than at an authorised workshop.
1)Drain the old fluid
Find the brake master cylinder, remove its cap and drain off as much of the fluid as possible. The best way to tackle this is with the car up on axle stands, with all four wheels removed.
2)Change brake fluid
Fill the master cylinder right up to the FULL line with new brake fluid.
3)Flush the calipers/wheel cylinders
Release the bleed nipple at the back of each brake calliper/wheel cylinder to drain the old brake fluid.
4)Bleed the brakes
Go to each caliper/wheel cylinder in turn and open the bleed nipple to complete the brake fluid change draining out the last of the old fluid and any air bubbles until the new fluid comes through.
Keep checking the level of brake fluid in the master cylinder and keep it topped up.
6)Repeat the process
Bleed each caliper/wheel cylinder in turn until you have worked your way through all of them.
Whenever you change brake fluid or someone does it on your behalf, dispose of the old oil in an environmentally friendly manner. There are different rules for ASR (traction control), ESP, SBC and hybrid / electric propulsion cars and you should check these out before disposing of used fluid.
A skilled mechanic will be able to carry out a brake oil change in 30 to 60 minutes.
Some workshops use brake flushing machines. Brake flushing machines eliminate the need for a second technician and include a pressure regulator and gauge to set proper fluid pressure.
Castrol Dot 4 brake fluid is liquid engineered to prevent vapour lock and protect your brake system. To find out more about Castrol’s brake fluids.
Running with a low oil level is incredibly bad for your engine, so it's important to check your engine oil regularly. Don't rely on dashboard warning lights alone; checking engine oil at the dipstick is a simple but important car maintenance task that absolutely everyone can do at home.
Most cars use a little engine oil over time so it is essential to maintain the right level of engine oil by topping up with the right oil whenever your dipstick check says your oil level is low.
Why choose full synthetic engine oil? Even if your warranty doesn't depend on you choosing synthetic engine oil, it's still the strongest and best choice for every engine. As long as you choose the right grade and specification of synthetic oil, it is guaranteed to exceed the manufacturer's requirements and give your engine the best possible protection.
While oil is a natural resource, it occurs deep in the ground where it can't damage plant and animal life. It's vitally important that any used engine oil from home car maintenance makes it to a recycling centre, as this ensures that it won't leak into the ground, potentially causing hazards to wildlife and water resources.