Tag Info

Hot answers tagged

13

DOT4 brake fluid has a higher boiling point than DOT3, making the fluid less likely to boil. Using cheaper, lower-grade fluid increases the chances of your brakes failing in situations where they build up lots of heat, e.g., driving down a mountain on a twisty road. More information: http://www.carbibles.com/brake_bible_pg2.html


11

If you lost all (or almost all) of your brake fluid, you have a leak. Check all of your calipers (assuming disk brakes all around) to see if there is a leak at the wheels. If none there, check the soft lines (rubber lines at the wheel) for leaks. If no leaks there, check around the master cylinder and anti-lock brake unit for leaks from the lines. If you do ...


9

If the manual is saying small amounts of DOT3 can be used, what they are most likely saying is if you find yourself with low brake fluid and only DOT3 is available, it is better to use that than to not have brake fluid. Once you get back home though you need to get the recommended DOT4 back in the system by bleeding the system and filling with DOT4. As ...


7

Most people realize that brakes work by turning kinetic energy into heat. The brake rotors and pads get very hot, this heat is transferred to the brake fluid as well, if the brake fluid gets too hot and boils it effectively puts air in the lines and will lead to brake failure. You can put DOT 4 in place of Dot 3 but not the other way around. Note DOT 5 is ...


6

As R.. says, the remaining softness will be down to air in the lines - this can be fixed by properly bleeding the system. Before you do that, however, you need to establish the cause of the loss - until you do so, the car should be regarded as dangerous and must not be used. If you're in any doubt, take it to a professional. The most likely cause of a ...


4

Prestone does make product that is compatible with DOT3 and DOT4 fluid referred to as DOT3/4. Several sites state you can use 4 in place of 3. However using 3 in place 4 may decrease brake performance. Without knowing the year it is hard to tell which is the most correct type of fluid for your Toyota. Regardless of the type used, that is the lesser of your ...


3

The main difference of DOT3 and DOT4 is boiling point of the fluid. The DOT3 standard has a lower minimum boiling point requirement then DOT4. Not all fluids are made equal and they will all typically list what both their Dry and Wet boiling points are. You can have one DOT3 fluid that just barely makes it past the standard, then another that can handle ...


2

Im useles with computers but please read the whole thing it might help you one day and correct on anything not true. not all sure how much of this is true but info i so far know and go by, dot 4 has a higher boiling point and also has borate esters. dot 5 is silicone based this is the dry boiling point minimum as i know of; dot 3, 205 C (401 F) dot 4, ...


2

Check Brake Fluid on Wikipedia. DOT 5 is not interchangeable or compatible with DOT 3, 4, and 5.1 fluids and can cause catastrophic system failure. Dot 3, 4, and 5.1 are glycol ether based. They are compatible, but like motor oils, you should use the recommended or higher grade fluid. Dot 4 and 5.1 also have borate ester to handle higher temperatures. DOT ...


2

I agree with the other posts. First: Do not drive the car until this is fixed. You will NOT save money by wrecking your car and maybe putting yourself in the hospital. Second: if you're going to do the work yourself, get a how-to manual. Brakes (and steering) are safety-critical systems; if they fail they put both you and those around you in danger. ...


2

Brake fluid by nature is hygroscopic, meaning it absorbs water. Even though it is considered a closed system, it doesn't mean it isn't hermetically sealed. Brake fluid will absorb water, have no doubt. You should change your brake fluid once a year or there about. As the brake fluid absorbs water, it becomes less tolerant of heat, meaning it boils at a ...


2

The brake fluid was running low, during heavy acceleration or turning the fluid will roll away from the sensor, which created the warning. I topped up with DOT4 brake fluid and the problem has been resolved. Do not shake the Brake fluid you do not want bubbles dispersed in you brake fluid.


1

Did you change out the master cylinder along with the brake booster when you did the swap? If so, you needed to bleed the brakes when you did this (assuming this from your comment about not bench bleeding the master cylinder). This would be why you are having to press the brakes nearly to the floor to get the car to stop. If you did bleed the brakes, perhaps ...



Only top voted, non community-wiki answers of a minimum length are eligible