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Toyota surf brake problem

The brake pedal of my toyota surf doesn't work properly i fix all the brakes pads and cylinders i even bypass the proportioning valve .. the brake slightly work when you press the pedal, but when you press it further it just like there's something that is blocking it.

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If you replace the wheel cylinders or brake calipers and did not bleed them properly, you most likely have air in the lines, If the rear brakes are drum brakes they need to be adjusted (if taken apart or new parts put on) or the pedal may sink when pressed.
1. If the brake pedal is soft when pressed down, the brake lines have air in them and need bleeding to remove the air.
2. a soft brake pedal can also be a bad master cylinder. Replace the master cylinder if the lines have been bleed correctly but the pedal is still soft or sinking when the pedal is pressed.

Posted on Dec 08, 2012

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SOURCE: Brakes no longer work in 1989 Chevy half ton pickup 2 wheel drive 350cubic inch

change dump valve under master cylinder

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SOURCE: 98 caravan no abs

sounds to me if you replaced all of that than the power booster is sticking

Posted on Oct 27, 2008

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SOURCE: brakes

Flexible brake lines are probably balooning out causing pressure not to build up, replace flexible to the calipers.

Posted on Mar 03, 2009

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Its probably how your bleeding your brakes, but first make sure the bleeding nipples are facing upward. You should bleed diagonaly, front pass wheel then rear driver wheel. Then front driver wheel and rear pass wheel. The abs light has its own computer your have to get it scanned to clear the codes and turn off the light

Posted on Mar 18, 2009

askjhuber
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SOURCE: Where can I find a brake proportioning valve for my 97 S-10?

When people tell me they hate there ABS, alot of people who pull trailer do. I tell them just to pull the fuse this will stop them completely. Yeah theres a light ont he dash but that can alos be delt with by removing the bulb for it. But int he long run just pulling the fuse is quick and Free.

Posted on May 17, 2009

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1999 corolla, brake pedal goes to the floor. how can we fix the brakes?


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Have you tested your brake booster and your calipers?Your brake booster doesn't make any noise, and it doesn't use any electricity or gasoline, but it ensures that you can stop your car with only a light touch of the brake pedal. Things weren't always like that: before the invention of the vacuum brake booster, cars still stopped. It's just that you had to really stomp on the brake pedal. The modern brake booster is an ingenious device that operates using something that your engine generates whenever it's running: vacuum. The brake booster takes engine vacuum via a rubber hose that runs from the intake manifold, and the brake booster uses that vacuum to amplify the pressure you put on the pedal. A light application of the brakes is translated by the brake booster into significantly more pressure on the brake master cylinder, ensuring that your car stops quickly. So what happens to the brake booster if your car stalls, resulting in a loss of engine vacuum? Early designers realized that gas engines were hardly foolproof, so they designed a little check valve into the brake booster circuit. The brake booster stores enough vacuum to provide full boost for two or three pedal applications even after the engine dies. The check valve on the brake booster is what keeps that vacuum from leaking out. And speaking of leaks, that's the reason most brake booster units have to be replaced. As your brake booster ages, the rubber seals and diaphragms that hold the vacuum tend to wear out and crack. If the brake booster can't hold vacuum (despite the check valve's best efforts), its time is up and you'll need a new or remanufactured new brake booster.

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2. One of your drum brakes has a wheel cylinder that has failed causing a noticable behind the tire leak (most common) correction is to replace all brake hardware and wheel cylinder.
3. One of the brake lines is cracked,broken, inspect for leaks and replace with new line.
4. notice on disc brakes if a brake caliper fails (part that squeezes brake pads to rotor) you will have the same symptoms of a broken wheel cylinder, this would of gradually occured feeling a heavy pedal or pulsation.

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Then you have to have leakage someshere, or, the Master Cylinder is bypassing brake fluid under & around the seals within itself, needing replacement.

The hydraulic system is straightforward. Push the brake pedal, it pushes a rod that pushes the seals inside of the master cylinder that pushes the brake fluid through the lines to the porpotioning valve, which pushes the fluid to each wheel & if there are pads or shoes at those wheels and nothing leaking, the pads/shoes have to work unless the master cylinder is leaking.

Check inside of the vehicle, around & under the carpet behind the brake pedal. If you ae losing or leaking fluid & you can't find it anywhere else, you should find it in the floorboard of the car.

If the system has been opened lately for repairs, then this could be due to air in the system and the need to bleed the brakes. You'll need to have an assistant help with that, work from the farthest point away from the master cylinder with bleeding at each wheel & work to the closest one last. If you do this, keep the master cyliinder full at all times after each brake at each wheel is done. good luck

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