Yesterday I filled the brake fluid on my toyota alot further than the max line. I marked it and it was about a 1/4" under the cap. After a short while I checked and it dropped about 1/2" and stayed there. Is this normal from expansion or do I have a problem? I checked all the lines, calipers and wheel cylinders and have no leaks. I did however last year replace the aftermarket dorman mastercylinder I had because it was leaking at the rear seal. I pulled this one out yesterday and it wasnt leaking at the seal, but had some fluid the area around it (I assume left over fluid from the old master cylinder).
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Note the big round vacuum booster behind it. You don't need that turkey baster thing he is using, just to check and top up. There will be a line on the side marked "Max", so just fill up to there from a container clearly marked "Brake Fluid". Nothing else is OK.
Hello. Welcome to FixYa. Please allow us to assist you.
We are sorry that you are having issues with your Toyota.
What you are describing, the brake light illuminating on and off may be due to s low brake fluid condition in the brake master cylinder reservoir.
There is a sensor in the master cylinder that monitors the quantity of the brake fluid present. As the brakes wear, the fluid level drops proportionately.
What you can do:
Open the hood, and closely examine the fluid level in the plastic reservoir on the brake master cylinder. It is located at the engine side of the firewall, pretty much in line with your turn signal switch. Look at the side of the cylinder reservoir. There will be a "MAX" line, and a "MIN" line.
The Max is the proper fill level.
If the fluid level is close to the Min line, you probably need some front brake pads replaced.
This indicates a low fluid condition in the reservoir.
We would not suggest 'topping off' the fluid, just to extinguish the light. When you do get your brake pads replaced, the extra fluid will be forced out of the top of the reservoir, and the brake fluid will get on the paint under your hood. Brake fluid will damage your paint.
Suggestion: Get the front brake pads checked, replace them if they are worn.
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Engine compartment, Driver's side, firewall, just above the steering column in front of the power buster (big round thing), there is a reservoir, on the top of the cap it says BRAKE FLUID ONLY, that's where you put the brake fluid in. Fill it up to the FULL mark, do not overfill it.
CLUTCH AND MASTER CYLINDER SHARE THE SAME RESERVOIR YOU CHECK LEVEL IN THE MASTER CYLINDER.ADD BRAKE FLUID TO THE MAX LINE DONT OVER FILL.IF MASTER CYLINDER RESERVOIR IS EMPTY.CHECK FOR FLUID LEAKS AT CLUTCH LINES AND CONNECTIONS AT CLUTCH RELEASE CYLINDER AND CHECK BRAKE LINES - CALIPERS - WHEEL CYLINDERS AND BRAKE BOOSTER.FIX LEAKS AND BLEED BRAKE AND CLUTCH SYSTEM.
If your brake system seems to be operating ok, then more than likely the system is low on fluid. As brake pads wear, this allows greater travel in the caliper and thus the caliper piston has to travel further to make the pads come into contact with the brake rotor, causing the fluid level to drop in the reservoir. Once the fluid level drops so far, the brake warning lamp will illuminate. When you check the fluid level, also inspect under the vehicle and around the brake lines for and sign of brake fluid leakage that could be causing you to lose fluid as well.
If the fluid is lower use dot3 brake fluid.There is a sensor in the master cylinder for the level.If the light goes off then have your brakes checked out if your pads are low the the calipers will be moved out when this happens the fluid level will drop if the calipers are push back in after brake pads are installed the fluid level will go back up i hopes this helps :)
Have your brakes check out, could be getting low on brake pads or shoes, which will make your brake fluid get low, to make up for the space of wear of your brake pads or shoes, check and fill your master cylinder to the max level mark.Being that the brake fluid is low the sensor in the master cylinder will make the warning light come on.Fill and have your brakes checked.
Usually means that there is a problem with your braking system. Note that brake fluid is HIGHLY TOXIC so please be careful when handling it. Check the brake fluid level in the engine bay brake fluid reservoir to ensure that its upper level falls between the MIN / MAX marks. If it is below the MIN level in the try topping it up to the MAX mark with the appropriate rating of brake fluid, but as there may be air in the braking system ideally you should arrange for the car to be transported to a garage to have your braking system checked and the brakes bled. There may be a hydraulic fluid leak in your braking system somewhere along its length (park the car on a dry level parking area and look to see if any 'wet' marks appear on the tarmac - this is a distinct possibility if the brake fluid level in the reservoir is lower than the MIN level. Look for unexpected wetness on (a) the inside of the road wheels, or brake cylinders (any wetness found could indicate damaged seals in the brake calipers or cylinders) and (b) along the length of the brake pipes and at any of the junctions of the Master Cylinder.