Shimano is one of the most notable brands to use mineral oil, as well as Campagnolo and Magura. This increased modulation and control over how much brake force is exerted depending on how far you pull the lever also means you stand less chance of locking up your wheel when you use the brakes. The fluid held in the lever reservoir effectively tops the system up over time as the brake pads wear down, so that braking is consistent. When you let go of the lever, the fluid moves back into the reservoir.īrake fluid needs to be able to withstand high temperatures and typically has a high boiling point, far above what a brake would be subject to in normal conditions.īrake fluid is also incompressible, helping to ensure that all the power from the lever is transferred to the pads.Ī hydraulic braking system offers better modulation compared to mechanical cable-operated disc brakes, or rim brakes.īecause a hydraulic system is sealed and there are no cables to stretch, it offers more reliable braking. ![]() The brake pads are secured against the pistons, so when the pistons move the brake pads then contact the disc rotor. This forces the pistons to move out from their housing in the caliper (known as the bores). ![]() When you actuate the brake lever, a piston in the lever is depressed, sending fluid down the hydraulic hose to the brake caliper. Yet, the sound still persists.The correct fluid keeps your brakes working optimally. I have had the vehicle to the garage twice and was assured that everything is OK. As speed is increased, the "we-we-we" sound increases and can be heard to 30 miles an hour and above. I replaced two tires and had all the tires rotated and balanced. Lately there has been a noise coming from the front left driver's side wheel. Keeping in mind the car's age, I can't help but wonder about using an aluminized dashboard sun shield in place while the car is parked in the sun. Codes 050/052 indicate a sunload sensor problem. Codes 030/031 indicate an in-car temperature sensor problem, and codes 040/041/042/043 point toward the ambient temperature sensor. Codes 024/025, along with the clicking noise, indicate a bad blend door actuator. Hitting the "Defrost" button cancels the diagnostic mode and deletes any codes. With the car's interior stabilized near room temperature, enter the self-test mode by pressing the "Off" and "Floor" buttons simultaneously, then release and within two seconds push the "Auto" button to read fault codes. The air conditioning in the car works great otherwise.Ī Start by using the self-diagnosing capabilities built into the climate control system. I think it's because the temperature sensor for the climate control is at fault. As the car cools down, I can slowly lower this setting, but if it's 80 or higher outside, I can never lower it to below 70 or so. If I quickly raise the temperature setting on the control to a high value, the motor will stop doing this. ![]() When the car sits in the sun and you start it up, you can hear the familiar clicking sound of the blend door motor trying to seek a position - similar to what I heard when the gears in the motor were bad. Everything worked well, but when warm weather arrived in the spring I started having a problem. Q I had to replace the blend door motor in the climate control system of my '97 Town Car. But it is not compatible with conventional fluids. Silicone brake fluid - DOT 5 - is silicone-based with a high boiling point suitable for motorsports, isn't sensitive to absorbing moisture and doesn't damage paint. All are synthetic in the sense that they are blends, but the "synthetic" label on some indicates they are more resistant to absorbing moisture - a characteristic of all conventional brake fluids and the reason many carmakers recommend periodic flushing, bleeding and replacement. Department of Transportation specifications) are conventional glycol/ester-based hydraulic fluids, meaning they can and will damage paint if spilled on automotive bodywork. All DOT 3, DOT 4 and DOT 5.1 fluids (the numbers refer to U.S. How does that differ from the conventional DOT 3 or DOT 4 fluid? How does that differ from silicone brake fluid? And my main question: Does synthetic brake fluid "eat the paint" if spilled on the car?Ī I think much of the confusion over brake fluids is whether "synthetic" is the same as "silicone" - and it's not. Q I see many brake fluids on the market are now synthetic DOT 3 or DOT 4.
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